Smsc Usb2512B Users Manual USB2512/USB2512A/USB2512B, USB2513/USB2513B, USB2514/USB2514B, USB2517 USB 2.0 Hi Speed Hub Controller

USB2512B to the manual 0edab894-6562-4bf9-9e53-bb188a8f6708

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USB2512/12A/12B
USB2513/13B
USB2514/14B
USB2517
USB 2.0 Hi-Speed
Hub Controller

PRODUCT FEATURES

Datasheet

General Description

Features

The SMSC USB251x hub is a family of low-power, OEM
configurable, MTT (multi transaction translator)1 hub
controller IC products for embedded USB solutions. The
“x” in the part number indicates the number of
downstream ports available. The SMSC hub supports
low-speed, full-speed, and hi-speed (if operating as a hispeed hub) downstream devices on all of the enabled
downstream ports.

„

For a summary of the products documented in this
datasheet, please refer to the Chapter 1, "USB251x Hub
Family Differences Overview," on page 7.

„

Highlights

„

„

„
„

„

High performance, low-power, small footprint hub
controller IC with 2, 3, 4, or 7 downstream ports
(indicated by the “x” in the part number)
Fully compliant with the USB 2.0 specification
Enhanced OEM configuration options available
through either a single serial I2C® EEPROM, or
SMBus slave port
MultiTRAKTM

— High-performance multiple transaction translator which
provides one transaction translator per port

„
„

„

„
„

„

„
„
„

— 36-pin QFN (6x6 mm)
— 48-pin QFN (7x7 mm)
— 64-pin QFN (9x9 mm)

„

USB251xi, USB2512Ai, and USB251xBi products
support the industrial temperature range of -40ºC
to +85ºC

Applications
„

PortMap

„

— Flexible port mapping and disable sequencing

„

PortSwap

„

— Programmable USB differential-pair pin locations ease
PCB design by aligning USB signal lines directly to
connectors

„

PHYBoost

„

— Programmable USB signal drive strength for recovering
signal integrity using 4-level driving strength resolution

Full power management with individual or ganged
power control of each downstream port
Fully integrated USB termination and pull-up/pulldown resistors
Supports a single external 3.3 V supply source;
internal regulators provide 1.2 V or 1.8 V internal
core voltage
On-chip driver for 24 MHz crystal resonator or
external 24/48 MHz clock input
Customizable vendor ID, product ID, and device ID
ESD protection up to 4 kilovolts on all USB pins
Supports self- or bus-powered operation
USB251xB2 and USB251xBi products support the
USB Battery Charging specification
Lead-free RoHS compliant packages:

„
„
„

LCD monitors and TVs
Multi-function USB peripherals
PC motherboards
Set-top boxes, DVD players, DVR/PVR
Printers and scanners
PC media drive bay
Portable hub boxes
Mobile PC docking
Embedded systems

2.USB251xB and USB251xBi products are not yet available.
The information in this datasheet regarding USB251xB/Bi
serves as a preliminary product preview.

1.USB2512A/Ai only uses a single transaction translator.

SMSC USB251x Hub Family

DATASHEET

Revision 1.0 (3-11-09)

USB 2.0 Hi-Speed Hub Controller
Datasheet

ORDER NUMBERS:
LEAD-FREE
ROHS COMPLIANT
PACKAGE

PACKAGE SIZE

TEMPERATURE
RANGE

USB2512-AEZG
USB2512A-AEZG
USB2512B-AEZG
USB2513-AEZG
USB2513B-AEZG
USB2514-AEZG
USB2514B-AEZG

36QFN

6 x 6 x 0.5 mm

0ºC to 70ºC

USB2512i-AEZG
USB2512Ai-AEZG
USB2512Bi-AEZG
USB2513i-AEZG
USB2513Bi-AEZG
USB2514i-AEZG
USB2514Bi-AEZG

36QFN

6 x 6 x 0.5 mm

-40ºC to 85ºC

USB2513-HZH
USB2514-HZH

48QFN

7 x 7 x 0.5 mm

0ºC to 70ºC

USB2517-JZX

64QFN

9 x 9 x 0.5 mm

0ºC to 70ºC

USB2517i-JZX

64QFN

9 x 9 x 0.5 mm

-40ºC to 85ºC

ORDER NUMBERS

Note: USB251xB/USB251xBi products have not yet been released. They
are featured in this datasheet as a preliminary product preview.

80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
Copyright © 2009 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered
trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE
OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL
DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;
TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD
TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Revision 1.0 (3-11-09)

2

DATASHEET

SMSC USB251x

USB 2.0 Hi-Speed Hub Controller
Datasheet

Table of Contents
Chapter 1 USB251x Hub Family Differences Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 2 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Chapter 3 Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chapter 4 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 5 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1
5.2
5.3

Pin Configurations and Lists (Organized by Package Type) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
USB251x Pin Descriptions (Grouped by Function). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Chapter 6 LED Usage Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.1

LED Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.1.1
USB Mode 14-Wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.1.2
LED Mode Speed Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Chapter 7 Battery Charging Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.1
7.2
7.3

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
USB Battery Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2.1
Special Behavior of PRTPWR Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Charging Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3.1
Battery Charging enabled via EEPROM or SMBus . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31
31
31
32
32

Chapter 8 Configuration Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.1

8.2

8.3

8.4
8.5
8.6

Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.1
Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.2
SMBus or EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.3
VBus Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.1
Internal Register Set (Common to EEPROM and SMBus) . . . . . . . . . . . . . . . . . . . . . . .
8.2.2
I2C EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.3
In-Circuit EEPROM Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Slave Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.1
SMBus Slave Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.2
Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.3
Invalid Protocol Response Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.4
General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.5
Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.6
Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.7
SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.8
Bus Reset Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.9
SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Configuration Option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Strapping Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.6.1
External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.6.2
USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

33
33
33
34
34
35
52
52
53
53
53
54
54
54
54
54
54
55
55
55
55
55
58

Chapter 9 DC Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
SMSC USB251x

3

DATASHEET

Revision 1.0 (3-11-09)

USB 2.0 Hi-Speed Hub Controller
Datasheet

9.1
9.2

Maximum Guaranteed Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Chapter 10 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.1

Oscillator/Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.1.1 SMBus Interface: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.1.2 I2C EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.1.3 USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

66
66
66
66

Chapter 11 Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
11.1

Tape and Reel Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Revision 1.0 (3-11-09)

4

DATASHEET

SMSC USB251x

USB 2.0 Hi-Speed Hub Controller
Datasheet

List of Tables
Table 1.1
Table 1.2
Table 1.3
Table 5.1
Table 5.2
Table 5.3
Table 8.1
Table 8.2
Table 8.3
Table 8.4
Table 8.5
Table 8.6
Table 8.7
Table 8.8
Table 8.9
Table 9.1
Table 9.2

36-pin QFN (6x6x0.5 mm) RoHS Compliant Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
48-pin QFN (7x7x0.5 mm) RoHS Compliant Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
64-pin QFN (9x9x0.5 mm) RoHS Compliant Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pin List in Alphabetical Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
USB251x Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Internal Default, EEPROM and SMBus Register Memory Map. . . . . . . . . . . . . . . . . . . . . . . . 35
PortMap Register for Ports 1 & 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
PortMap Register for Ports 3 & 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
PortMap Register for Ports 5 & 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
PortMap Register for Port 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Pin Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

SMSC USB251x

5

DATASHEET

Revision 1.0 (3-11-09)

USB 2.0 Hi-Speed Hub Controller
Datasheet

List of Figures
Figure 4.1
Figure 5.1
Figure 5.2
Figure 5.3
Figure 5.4
Figure 5.5
Figure 5.6
Figure 6.1
Figure 7.1
Figure 8.1
Figure 8.2
Figure 8.3
Figure 8.4
Figure 8.5
Figure 9.1
Figure 10.1
Figure 10.2
Figure 10.3
Figure 11.1
Figure 11.2
Figure 11.3
Figure 11.4
Figure 11.5
Figure 11.6

USB251x Hub Family Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-Port 36-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-Port 36-pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-Port 36-pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-Port 48-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-Port 48-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-Port 64-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dual Color LED Implementation Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Charging via External Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset_N Timing for Default/Strap Option Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Rise Time Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Crystal Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Formula to Find the Value of C1 and C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Simplified Form of the Capacitance Formula . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36-Pin QFN, 6x6 mm Body, 0.5 mm Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
48-Pin QFN, 7x7 mm Body, 0.5 mm Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
64-Pin QFN, 9x9 mm Body, 0.5 mm Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36-Pin Package Tape Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
48-Pin Package Tape Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36-Pin and 48-Pin Package Reel Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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11
12
13
14
15
16
17
29
31
53
54
56
57
58
61
66
66
66
67
68
69
70
71
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USB 2.0 Hi-Speed Hub Controller
Datasheet

Chapter 1 USB251x Hub Family Differences Overview
Table 1.1 36-pin QFN (6x6x0.5 mm) RoHS Compliant Part Numbers
Part
Number

Downstream
ports

Default
TT

USB2512
USB2512A
USB2512B

2

multi**

3*

USB2512i
USB2512Bi
USB2512Ai

2

multi**

3*

multi

3*

24

multi

3*

24

multi

3*

24

multi

3*

24

USB2513
USB2513B
USB2513i
USB2513Bi
USB2514
USB2514B
USB2514i
USB2514Bi

3

3
4

4

True
Speed

Battery
Charging

LED Port
Indicators

Clock
(MHz)

24

0ºC
to
70ºC

-40ºC
to
85ºC

3

24

3
3
3
3
3

Table 1.2 48-pin QFN (7x7x0.5 mm) RoHS Compliant Part Numbers
Part
Number

Downstream
ports

Default
TT

True
Speed

USB2513

3

multi

USB2514

4

multi

Battery
Charging

LED Port
Indicators

Clock
(MHz)

0ºC
to
70ºC

3

3

24/48

3

3

3

24/48

3

-40ºC
to
85ºC

Table 1.3 64-pin QFN (9x9x0.5 mm) RoHS Compliant Part Numbers
Part
Number

Downstream
ports

Default
TT

True
Speed

USB2517

7

multi

USB2517i

7

multi

Battery
Charging

LED Port
Indicators

Clock
(MHz)

0ºC
to
70ºC

3

3

24

3

3

3

24

Note 1.1

*Battery charging enable is only available on USB251x/xBi products.

Note 1.2

**USB2512A/Ai only uses a single transaction translator.

SMSC USB251x

7

DATASHEET

-40ºC
to
85ºC

3

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Datasheet

Chapter 2 General Description
The SMSC USB251x hub family is a group of low-power, OEM configurable, MTT (multi
transaction translator)1 hub controller IC’s with downstream ports for embedded USB solutions.
The SMSC USB251x hub family is fully compliant with the USB 2.0 specification. Each of the
SMSC hub controllers can attach to an upstream port as a full-speed hub or as a full-/hi-speed
hub. The SMSC hub controllers support low-speed, full-speed, and hi-speed (if operating as a
hi-speed hub) downstream devices on all of the enabled downstream ports.
All required resistors on the USB ports are integrated into the hub. This includes all series
termination resistors on D+ and D– pins and all required pull-down and pull-up resistors on D+
and D– pins. The over-current sense inputs for the downstream facing ports have internal pullup resistors.
The USB251x hub family includes programmable features such as:
MultiTRAKTM Technology which utilizes a dedicated TT per port to maintain consistent fullspeed data throughput regardless of the number of active downstream connections. MultiTRAKTM
outperforms conventional USB 2.0 hubs with a single TT in USB full-speed data transfers.
PortMap which provides flexible port mapping and disable sequences. The downstream ports of
a USB251x hub can be reordered or disabled in any sequence to support multiple platform
designs with minimum effort. For any port that is disabled, the USB251x hub controllers
automatically reorder the remaining ports to match the USB host controller’s port numbering
scheme.
PortSwap which adds per-port programmability to USB differential-pair pin locations. PortSwap
allows direct alignment of USB signals (D+/D-) to connectors to avoid uneven trace length or
crossing of the USB differential signals on the PCB.
PHYBoost which enables 4 programmable levels of USB signal drive strength in downstream
port transceivers. PHYBoost attempts to restore USB signal integrity.

OEM Selectable Features
A default configuration is available in each of the SMSC USB251x hub controllers following a
reset. This configuration may be sufficient for most applications. Strapping option pins make it
possible to modify a sub-set of the configuration options.
The USB251x hub controllers may be configured by an external EEPROM or a microcontroller.
When using the microcontroller interface, the hub appears as an SMBus slave device. If the hub
is pin-strapped for external EEPROM configuration but no external EEPROM is present, then a
value of ‘0’ will be written to all configuration data bit fields (the hub will attach to the host with
all ‘0’ values).
The USB251x hub family supports OEM selectable features including:
„

Optional OEM configuration via I2C EEPROM or via the industry standard SMBus interface
from an external SMBus host or microcontroller.

„

Supports compound devices on a port-by-port basis.

„

Selectable over-current sensing and port power control on an individual or ganged basis to
match the OEM’s choice of circuit board component selection.

„

Customizable vendor ID, product ID, and device ID.

„

Configurable delay time for filtering the over-current sense inputs.

„

Configurable downstream port power-on time reported to the host.

„

Supports indication of the maximum current that the hub consumes from the USB upstream
port.

„

Supports Indication of the maximum current required for the hub controller.

1.USB2512A/2Ai only uses a single transaction translator.
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SMSC USB251x

USB 2.0 Hi-Speed Hub Controller
Datasheet
„

Supports custom string descriptors (up to 31 characters):
- Product string
- Manufacturer string
- Serial number string

„

When available, pin selectable options for default configuration may include:
-Downstream ports as non-removable ports
-Downstream ports as disabled ports
-Downstream port power control and over-current detection on a ganged or individual basis
-USB signal drive strength
-USB differential pair pin location

SMSC USB251x

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USB 2.0 Hi-Speed Hub Controller
Datasheet

Chapter 3 Acronyms
I2C®: Inter-Integrated Circuit1
OCS: Over-Current Sense
PCB: Printed Circuit Board
PHY: Physical Layer
PLL: Phase-Locked Loop
QFN: Quad Flat No Leads
RoHS: Restriction of Hazardous Substances Directive
SCL: Serial Clock
SIE: Serial Interface Engine
SMBus: System Management Bus
TT: Transaction Translator

1.I2C is a registered trademark of Philips Corporation.
Revision 1.0 (3-11-09)

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SMSC USB251x

USB 2.0 Hi-Speed Hub Controller
Datasheet

Chapter 4 Block Diagram

To Upstream
VBUS

Upstream
USB Data

To EEPROM or
SMBus Master

24 MHz
Crystal

SDA SCK

3.3 V

BusPower
Detect/
Vbus Pulse

Upstream
PHY

Regulator

Serial
Interface

PLL

Serial
Interface
Engine

Repeater

...

3.3 V
TT
#1

Regulator

Controller

TT
#x

Port
Controller

CRFILT

Routing & Port Re-Ordering Logic

Port #1
PHY#1

OC Sense
Switch Driver/
LED Drivers

...

OC
USB Data
Port
Downstream Sense Power
Switch/
LED
Drivers

Port #x
PHY#x

OC Sense
Switch Driver/
LED Drivers

USB Data OC
Port
Downstream Sense Power
Switch/
LED
Drivers

The ‘x’ indicates the number of available downstream ports: 2, 3, 4, or 7.
Figure 4.1 USB251x Hub Family Block Diagram
Note 4.1

USB2512A/USB2512Ai only supports a single transaction translator.

Note 4.2

The LED port indicators only apply to USB2513/14 (48QFN only) and USB2517/17i.

SMSC USB251x

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USB 2.0 Hi-Speed Hub Controller
Datasheet

Chapter 5 Pin Descriptions
This chapter is organized by a set of pin configurations (organized by package type) followed by a
corresponding pin list organized alphabetically. A comprehensive and detailed description list of each
signal (named in the pin list) is organized by function in Table 5.2, “USB251x Pin Descriptions,” on
page 22. Please refer to Table 5.3, “Buffer Type Descriptions,” on page 27 for a list of buffer types.
The “N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal
is at a low voltage level. When “N” is not present after the signal name, the signal is asserted when it
is at the high voltage level. The terms assertion and negation are used exclusively. This is done to
avoid confusion when working with a mixture of “active low” and “active high” signals. The term assert,
or assertion, indicates that a signal is active, independent of whether that level is represented by a
high or low voltage. The term negate, or negation, indicates that a signal is inactive.

VBUS_DET

RESET_N

HS_IND / CFG_SEL[1]

SCL / SMBCLK / CFG_SEL[0]

VDD33

SDA / SMBDATA / NON_REM[1]

NC

NC

NC

27

26

25

24

23

22

21

20

19

Pin Configurations and Lists (Organized by Package Type)

SUSP_IND / LOCAL_PWR / NON_REM[0]

28

18

NC

VDD33

29

17

OCS_N[2]

USBDM_UP

30

16

PRTPWR[2] / BC_EN[2]*

USBDP_UP

31

15

VDD33

XTALOUT

32

14

CRFILT

XTALIN / CLKIN

33

13

OCS_N[1]

PLLFILT

34

12

PRTPWR[1] / BC_EN[1]*

RBIAS

35

11

TEST

VDD33

36

10

VDD33

SMSC
USB2512/12A/12B
USB2512i/12Ai/12Bi
(Top View QFN-36)

3

4

5

6

7

8

9

USBDP_DN[2]

VDD33

NC

NC

NC

NC

2

USBDM_DN[2]

1

USBDP_DN[1]

Ground Pad
(must be connected to VSS)

USBDM_DN[1]

5.1

Indicates pins on the bottom of the device.
Figure 5.1 2-Port 36-Pin QFN
Note: *Battery charging enable (BC_EN) is only available in the USB251xB/Bi.
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SMSC USB251x

USB 2.0 Hi-Speed Hub Controller

VBUS_DET

RESET_N

HS_IND / CFG_SEL[1]

SCL / SMBCLK / CFG_SEL[0]

VDD33

SDA / SMBDATA / NON_REM[1]

NC

NC

OCS_N[3]

27

26

25

24

23

22

21

20

19

Datasheet

SUSP_IND / LOCAL_PWR / NON_REM[0]

28

18

PRTPWR[3] / BC_EN[3]*

VDD33

29

17

OCS_N[2]

USBDM_UP

30

16

PRTPWR[2] / BC_EN[2]*

USBDP_UP

31

15

VDD33

XTALOUT

32

14

CRFILT

XTALIN / CLKIN

33

13

OCS_N[1]

PLLFILT

34

12

PRTPWR[1] / BC_EN[1]*

RBIAS

35

11

TEST

VDD33

36

10

VDD33

SMSC
USB2513/13i
USB2513B/13Bi
(Top View QFN-36)

1

2

3

4

5

6

7

8

9

USBDM_DN[1] / PRT_DIS_M[1]

USBDP_DN[1] / PRT_DIS_P[1]

USBDM_DN[2] / PRT_DIS_M[2]

USBDP_DN[2] / PRT_DIS_P[2]

VDD33

USBDM_DN[3] / PRT_DIS_M[3]

USBDP_DN[3] / PRT_DIS_P[3]

NC

NC

Ground Pad
(must be connected to VSS)

Indicates pins on the bottom of the device.

Figure 5.2 3-Port 36-pin QFN
Note: *Battery charging enable (BC_EN) is only available in the USB251xB/Bi.

SMSC USB251x

13

DATASHEET

Revision 1.0 (3-11-09)

USB 2.0 Hi-Speed Hub Controller

VBUS_DET

RESET_N

HS_IND / CFG_SEL[1]

SCL / SMBCLK / CFG_SEL[0]

VDD33

SDA / SMBDATA / NON_REM[1]

OCS_N[4]

PRTPWR[4] / BC_EN[4]*

OCS_N[3]

27

26

25

24

23

22

21

20

19

Datasheet

SUSP_IND / LOCAL_PWR / NON_REM[0]

28

18

PRTPWR[3] / BC_EN[3]*

VDD33

29

17

OCS_N[2]

USBDM_UP

30

16

PRTPWR[2] / BC_EN[2]*

USBDP_UP

31

15

VDD33

XTALOUT

32

14

CRFILT

XTALIN / CLKIN

33

13

OCS_N[1]

PLLFILT

34

12

PRTPWR[1] / BC_EN[1]*

RBIAS

35

11

TEST

VDD33

36

10

VDD33

SMSC
USB2514/14i
USB2514B/14Bi
(Top View QFN-36)

4

5

6

7

8

9

USBDM_DN[3] / PRT_DIS_M[3]

USBDP_DN[3] / PRT_DIS_P[3]

USBDM_DN[4] / PRT_DIS_M[4]

USBDP_DN[4] / PRT_DIS_P[4]

3
USBDM_DN[2] / PRT_DIS_M[2]

VDD33

2
USBDP_DN[1] / PRT_DIS_P[1]

USBDP_DN[2] / PRT_DIS_P[2]

1
USBDM_DN[1] / PRT_DIS_M[1]

Ground Pad
(must be connected to VSS)

Indicates pins on the bottom of the device.
Figure 5.3 4-Port 36-pin QFN
Note: *Battery charging enable (BC_EN) is only available in the USB251xB/Bi.

Revision 1.0 (3-11-09)

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DATASHEET

SMSC USB251x

USB 2.0 Hi-Speed Hub Controller

LED_B_N[1] / BOOST[0]

VBUS_DET

RESET_N

CFG_SEL[2]

HS_IND / CFG_SEL[1]

SCL / SMBCLK / CFG_SEL[0]

VDD33

SDA / SMBDATA / NON_REM[1]

NC

NC

OCS_N[3]

LED_A_N[2] / PRTSWP[2]

36

35

34

33

32

31

30

29

28

27

26

25

Datasheet

LED_A_N[1] / PRTSWP[1]

37

24

LED_B_N[2] / BOOST[1]

PRTPWR_POL

38

23

LED_A_N[3] / PRTSWP[3]

SUSP_IND / LOCAL_PWR / NON_REM[0]

39

22

LED_B_N[3] / GANG_EN

SEL48

40

21

PRTPWR[3]

20

OCS_N[2]

19

PRTPWR[2]

18

VDD33

17

CRFILT

VDD33

41

USBDM_UP

42

USBDP_UP

43

XTALOUT

44

XTALIN / CLKIN

45

16

OCS_N[1]

PLLFILT

46

15

PRTPWR[1]

RBIAS

47

14

TEST

VDD33

48

13

NC

SMSC
USB2513
(Top View QFN-48)

12
NC

9
NC

11

8
NC

10

7
USBDP_DN[3] / PRT_DIS_P[3]

NC

6

VDD33

5

4
USBDP_DN[2] / PRT_DIS_P[2]

VDD33

3

USBDM_DN[3] / PRT_DIS_M[3]

2
USBDP_DN[1] / PRT_DIS_P[1]

USBDM_DN[2] / PRT_DIS_M[2]

USBDM_DN[1] / PRT_DIS_M[1]

1

Ground Pad
(must be connected to VSS)

Indicates pins on the bottom of the device.
Figure 5.4 3-Port 48-Pin QFN

SMSC USB251x

15

DATASHEET

Revision 1.0 (3-11-09)

USB 2.0 Hi-Speed Hub Controller

LED_B_N[1] / BOOST[0]

VBUS_DET

RESET_N

CFG_SEL[2]

HS_IND / CFG_SEL[1]

SCL / SMBCLK / CFG_SEL[0]

VDD33

SDA / SMBDATA / NON_REM[1]

OCS_N[4]

PRTPWR[4]

OCS_N[3]

LED_A_N[2] / PRTSWP[2]

36

35

34

33

32

31

30

29

28

27

26

25

Datasheet

LED_A_N[1] / PRTSWP[1]

37

24

LED_B_N[2] / BOOST[1]

PRTPWR_POL

38

23

LED_A_N[3] / PRTSWP[3]

SUSP_IND / LOCAL_PWR / NON_REM[0]

39

22

LED_B_N[3] / GANG_EN

SEL48

40

21

PRTPWR[3]

VDD33

41

20

OCS_N[2]

USBDM_UP

42

19

PRTPWR[2]

USBDP_UP

43

18

VDD33

17

CRFILT

16

OCS_N[1]

15

PRTPWR[1]

14

TEST

13

LED_A_N[4] / PRTSWP[4]

12
LED_B_N[4]

9
USBDP_DN[4] / PRT_DIS_P[4]

11

8

NC

7
USBDP_DN[3] / PRT_DIS_P[3]

USBDM_DN[4] / PRT_DIS_M[4]

10

6

VDD33

5
VDD33

USBDM_DN[1] / PRT_DIS_M[1]

USBDM_DN[3] / PRT_DIS_M[3]

48
4

47

3

RBIAS
VDD33

Ground Pad
(must be connected to VSS)

USBDP_DN[2] / PRT_DIS_P[2]

46

USBDM_DN[2] / PRT_DIS_M[2]

PLLFILT

2

45

1

44

USBDP_DN[1] / PRT_DIS_P[1]

XTALOUT
XTALIN / CLKIN

SMSC
USB2514
(Top View QFN-48)

Indicates pins on the bottom of the device.
Figure 5.5 4-Port 48-Pin QFN

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SMSC USB251x

USB 2.0 Hi-Speed Hub Controller

LED_B_N[2] / BOOST[1]

LED_A_N[3] / PRTSWP[3]

VDD33

SUSP_IND / LOCAL_PWR / NON_REM[0]

VBUS_DET

RESET_N

HS_IND / CFG_SEL[1]

SCL / SMBCLK / CFG_SEL[0]

SDA / SMBDATA / NON_REM[1]

PRTPWR[6]

OCS_N[6]

OCS_N[7]

PRTPWR[7]

OCS_N[5]

LED_B_N[3] / GANG_EN

LED_A_N[4] / PRTSWP[4]

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

Datasheet

LED_A_N[2] / PRTSWP[2]

49

32

LED_B_N[4]

LED_B_N[1] / BOOST[0]

50

31

LED_A_N[5] / PRTSWP[5]

LED_A_N[1] / PRTSWP[1]

51

30

PRTPWR[5]

VDD33

52

29

PRTPWR[1]

USBDM_DN[6] / PRT_DIS_M[6]

53

28

OCS_N[1]

USBDP_DN[6] / PRT_DIS_P[6]

54

27

OCS_N[2]

USBDM_DN[7] / PRT_DIS_M[7]

55

26

PRTPWR[2]

USBDP_DN[7] / PRT_DIS_P[7]

56

25

CRFILT

24

VDD33

23

PRTPWR[3]

SMSC
USB2517/17i
(Top View QFN-64)

VDD33

57

USBDM_UP

58

USBDP_UP

59

22

OCS_N[3]

XTALOUT

60

21

OCS_N[4]

XTALIN / CLKIN

61

20

PRTPWR[4]

PLLFILT

62

19

TEST

RBIAS

63

18

LED_B_N[5]

VDD33

64

17

LED_A_N[6] / PRTSWP[6]

10

11

12

13

14

15

16

USBDP_DN[5] / PRT_DIS_P[5]

CFG_SEL[2]

LED_B_N[7]

LED_A_N[7] / PRTSWP[7]

LED_B_N[6]

7
USBDP_DN[3] / PRT_DIS_P[3]

VDD33

6

USBDM_DN[5] / PRT_DIS_M[5]

5
VDD33

USBDM_DN[3] / PRT_DIS_M[3]

9

4
USBDP_DN[2] / PRT_DIS_P[2]

USBDP_DN[4] / PRT_DIS_P[4]

3

8

2
USBDP_DN[1] / PRT_DIS_P[1]

USBDM_DN[2] / PRT_DIS_M[2]

USBDM_DN[4] / PRT_DIS_M[4]

1
USBDM_DN[1] / PRT_DIS_M[1]

Ground Pad
(must be connected to VSS)

Indicates pins on the bottom of the device.

Figure 5.6 7-Port 64-Pin QFN

SMSC USB251x

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DATASHEET

Revision 1.0 (3-11-09)

USB 2.0 Hi-Speed Hub Controller
Datasheet

Table 5.1 Pin List in Alphabetical Order
PIN NUMBERS

BC_EN[4]

-

12

-

12

-

-

16

-

16

-

16

-

18

-

18

-

-

20

USB2517
USB2517i

12

USB2514

USB2514B
USB2514Bi

-

USB2513

USB2514
USB2514i

BC_EN[3]

USB2513B
USB2513Bi

BC_EN[2]

Battery
Charging Strap
Option

USB2513
USB2513i

BC_EN[1]

NAME

64 QFN

USB2512B
USB2512Bi

SYMBOL

48QFN

USB2512
USB2512i
USB2512A
USB2512Ai

36 QFN

-

-

36

50

-

24

48

Configuration
Programming
Selection

24

31

41

25

32

42

-

33

13

CLKIN

External Clock
Input

33

45

61

CRFILT

Core Regulator
Filter Capacitor

14

17

25

GANG_EN

Ganged Port
Power Strap
Option

-

22

34

Ground Pad

Exposed Pad
Tied to Ground
(VSS)

HS_IND

Hi-Speed
Upstream Port
Indicator

25

32

42

Port LED
Indicator

-

37

51

-

25

49

BOOST[0]

PHY Boost
Strapping
Option

BOOST[1]
CFG_SEL[0]
CFG_SEL[1]
CFG_SEL[2]

LED_A_N[1]
LED_A_N[2]

ePad

LED_A_N[3]

-

LED_A_N[4]

23
-

47
13

33

LED_A_N[5]

-

31

LED_A_N[6]

-

17

LED_A_N[7]
LED_B_N[1]
LED_B_N[2]
LED_B_N[3]

Enhanced
Indicator
Port LED

15

-

36

50

-

24

48

-

22

34

LED_B_N[4]

-

12

32

LED_B_N[5]

-

18

LED_B_N[6]

-

16

LED_B_N[7]

-

14

LOCAL_PWR

Revision 1.0 (3-11-09)

Local Power
Detection

28

18

DATASHEET

39

45

SMSC USB251x

USB 2.0 Hi-Speed Hub Controller
Datasheet

Table 5.1 Pin List in Alphabetical Order (continued)
PIN NUMBERS

-

USB2517
USB2517i

USB2514B
USB2514Bi

USB2514
USB2514i

USB2513B
USB2513Bi

USB2513
USB2513i

6

64 QFN

USB2514

No Connect

48QFN
USB2513

NC

NAME

USB2512B
USB2512Bi

SYMBOL

USB2512
USB2512i
USB2512A
USB2512Ai

36 QFN

8

11

-

NC

7

-

9

-

NC

18

-

11

-

NC

19

-

12

-

NC

8

-

13

NC

9

-

27

-

NC

20

-

28

-

NC

21

NON_REM[0]
NON_REM[1]
OCS_N[1]
OCS_N[2]

-

NonRemovable
Port Strap
Option
Over-Current
Sense

OCS_N[3]

28

39

45

22

29

40

13

16

28

17

20

27

-

OCS_N[4]

19
-

26
21

-

22
28

21

OCS_N[5]

-

35

OCS_N[6]

-

38

OCS_N[7]
PLLFILT
PRT_DIS_M[1]
PRT_DIS_M[2]
PRT_DIS_M[3]

PLL Regulator
Filter Capacitor
Downstream
Port Disable
Strap Option

37

34

46

-

1

-

3

-

6

PRT_DIS_M[4]

-

8

-

62

8

PRT_DIS_M[5]

-

11

PRT_DIS_M[6]

-

53

PRT_DIS_M[7]

-

55

PRT_DIS_P[1]

-

2

PRT_DIS_P[2]

-

4

PRT_DIS_P[3]

-

7

PRT_DIS_P[4]

Port Disable

-

9

-

9

PRT_DIS_P[5]

-

12

PRT_DIS_P[6]

-

54

PRT_DIS_P[7]

-

56

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Table 5.1 Pin List in Alphabetical Order (continued)
PIN NUMBERS

PRTPWR[1]

USB Port
Power Enable

PRTPWR[2]
PRTPWR[3]

USB2517
USB2517i

USB2514

USB2513

USB2514B
USB2514Bi

64 QFN

12

15

29

16

19

26

-

PRTPWR[4]

USB2514
USB2514i

48QFN

USB2513B
USB2513Bi

USB2513
USB2513i

NAME

USB2512B
USB2512Bi

SYMBOL

USB2512
USB2512i
USB2512A
USB2512Ai

36 QFN

18
-

21
20

-

23
27

20

PRTPWR[5]

-

30

PRTPWR[6]

-

39

PRTPWR[7]

-

36

PRTPWR_POL

Port Power
Polarity
Strapping

-

38

-

PRTSWP[1]

Port Swap
Strapping
Option

-

37

51

-

25

49

PRTSWP[2]
PRTSWP[3]

-

PRTSWP[4]

23
-

47
13

33

PRTSWP[5]

-

31

PRTSWP[6]

-

17

PRTSWP[7]

-

15

RBIAS

USB
Transceiver
Bias

35

47

63

RESET_N

Reset Input

26

34

43

SCL

Serial Clock

24

31

41

SDA

Serial Data
Signal

22

29

40

Select 48 MHz
Clock Input

-

40

-

SMBCLK

System
Management
Bus Clock

24

31

41

SMBDATA

Server
Message Block
Data Signal

22

29

40

SUSP_IND

Active/Suspend
Status Indicator

28

39

45

Test Pin

11

14

19

USB Bus Data

30

42

58

31

43

59

SEL48

TEST
USBDM_UP
USBDP_UP

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Table 5.1 Pin List in Alphabetical Order (continued)
PIN NUMBERS

USBDM_DN[2]
USBDM_DN[3]

USB2517
USB2517i

64 QFN

USB2514

USB2513

USB2514B
USB2514Bi

USB2514
USB2514i

Hi-Speed USB
Data

48QFN

USB2513B
USB2513Bi

USBDM_DN[1]

USB2513
USB2513i

NAME

USB2512B
USB2512Bi

SYMBOL

USB2512
USB2512i
USB2512A
USB2512Ai

36 QFN

1
3
-

USBDM_DN[4]

6
-

8

-

8

USBDM_DN[5]

-

11

USBDM_DN[6]

-

53

USBDM_DN[7]

-

55

USBDP_DN[1]

2

USBDP_DN[2]

4

USBDP_DN[3]

-

USBDP_DN[4]

7
-

9

-

9

USBDP_DN[5]

-

12

USBDP_DN[6]

-

54

USBDP_DN[7]

-

VBUS_DET

Upstream
VBUS Power
Detection

VDD33

3.3 V Power

56

27

35

44

5

VDD33

10

VDD33

15

18

24

VDD33

23

30

46

VDD33

29

41

52

VDD33

36

48

57

VDD33
XTALIN
XTALOUT

SMSC USB251x

-

64

Crystal Input

33

45

61

Crystal Output

32

44

60

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5.2

USB251x Pin Descriptions (Grouped by Function)
Table 5.2 USB251x Pin Descriptions

SYMBOL

BUFFER
TYPE

DESCRIPTION
UPSTREAM USB 2.0 INTERFACES

USBDM_UP
USBDP_UP

IO-U

VBUS_DET

I/O12

USB Data
These pins connect to the upstream USB bus data signals (host, port, or
upstream hub).
Detect Upstream VBUS Power
Detects state of Upstream VBUS power. The SMSC hub monitors
VBUS_DET to determine when to assert the internal D+ pull-up resistor which
signals a connect event.
When designing a detachable hub, this pin should be connected to VBUS on
the upstream port via a 2 to 1 voltage divider.
For self-powered applications with a permanently attached host, this pin must
be connected to 3.3 V (typically VDD33).
DOWNSTREAM USB 2.0 INTERFACES

USBDP_DN[x:1]/
PRT_DIS_P[x:1]

IO-U

Hi-Speed USB Data
These pins connect to the downstream USB peripheral devices attached to
the hub’s port. To disable, pull up with a 10 K resistor to 3.3 V.

USBDM_DN[x:1]/
PRT_DIS_M[x:1]

Downstream Port Disable Strap Option
If this strap is enabled by package and configuration settings (see Table 8.1,
"Hub Configuration Options"), then this pin will be sampled at RESET_N
negation to determine if the port is disabled.
To disable a port, pull up both PRT_DIS_M[x:1] and PRT_DIS_P[x:1] pins
corresponding to the port numbers.

PRTPWR[x:1] /

O12

USB Power Enable
Enables power to USB peripheral devices downstream.
When PRTPWR_POL pin is unavailable, the hub supports active high power
controllers only.
When PRTPWR_POL pin is available, the active signal level of the PRTPWR
pins is determined by the power polarity strapping function of the
PRTPWR_POL pin.

BC_EN[x]

IPD

Battery Charging Strap Option
*This feature is only available on USB251xB/Bi.
If this strap is enabled by package and configuration settings, (see Table 8.1,
"Hub Configuration Options"), this pin will be sampled at RESET_N negation
to determine if ports [x:1] support the battery charging protocol (and thus the
supporting external port power controllers) that would enable a device to draw
the currents per the USB battery charging specification.
BC_EN[x] = 1: Battery charging feature is supported for port x
BC_EN[x] = 0: Battery charging feature is not supported for
port x

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Table 5.2 USB251x Pin Descriptions (continued)

SYMBOL

BUFFER
TYPE

DESCRIPTION

DOWNSTREAM USB 2.0 INTERFACES (continued)
LED_A_N[x:1] /

I/O12

Port LED Indicators
This pin will be active low when LED support is enabled via EEPROM or
SMBus.
Port Swap Strapping Option

PRTSWP[x:1]

If this strap is enabled by package and configuration settings (see Table 8.1,
"Hub Configuration Options"), this pin will be sampled at RESET_N negation
to determine the electrical connection polarity of the downstream USB port
pins (USB_DP and USB_DM).
Also, the active state of the LED will be determined as follows:
‘0’ = Port polarity is normal, LED is active high.
‘1’ = Port polarity (USB_DP and USB_DM) is swapped, LED is active low.
LED_B_N[7:4]

I/O12

Enhanced Indicator Port LED for ports 4-7
Enhanced indicator LED for ports 4-7. This pin will be active low when LED
support is enabled via EEPROM or SMBus.

LED_B_N[3] /
GANG_EN

I/O12

Enhanced Indicator Port LED for Port 3
Ganged Power and Over-current strap option
This signal selects between ganged or individual port power and over-current
sensing. If this strap is enabled by package and configuration settings (see
Table 8.1, "Hub Configuration Options"), this pin will be sampled at RESET_N
negation to determine the mode as follows:
‘0’ = Individual sensing and switching, LED_B_N[3] is active high.
‘1’ = Ganged sensing and switching, LED_B_N[3] is active low.

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Table 5.2 USB251x Pin Descriptions (continued)

SYMBOL

BUFFER
TYPE

DESCRIPTION

DOWNSTREAM USB 2.0 INTERFACES (continued)
LED_B_N[2:1] /

I/O12

Enhanced Indicator Port LED for ports 1 and 2
Enhanced indicator LED for ports 1 and 2. This pin will be active low when
LED support is enabled via EEPROM or SMBus.
If this strap option is enabled by package and configuration settings (see
Table 8.1, "Hub Configuration Options"), this pin will be sampled at RESET_N
negation to determine if all PHY ports (upstream and downstream) operate at
a normal or boosted electrical level. Also, the active state of the LEDs will be
determined as follows:

BOOST[1:0]

See Section 8.2.1.27, "Register F6h: Boost_Up," on page 45 and Section
8.2.1.29, "Register F8h: Boost_4:0," on page 47 for more information.
BOOST[1:0] = BOOST_IOUT[1:0]
BOOST[1:0] = ‘00’,
LED_B_N[2] is active high,
LED_B_N[1] is active high.
BOOST[1:0] = ‘01’,
LED_B_N[2] is active high,
LED_B_N[1] is active low.
BOOST[1:0] = ‘10’,
LED_B_N[2] is active low,
LED_B_N[1] is active high.
BOOST[1:0] = ‘11’,
LED_B_N[2] is active low,
LED_B_N[1] is active low.
PRTPWR_POL

IPU

Port Power Polarity Strapping
Port Power Polarity strapping determination for the active signal polarity of
the [x:1]PRTPWR pins.
While RESET_N is asserted, the logic state of this pin will (through the use
of internal combinatorial logic) determine the active state of the PRTPWR
pins in order to ensure that downstream port power is not inadvertently
enabled to inactive ports during a hardware reset.
When RESET_N is negated, the logic value will be latched internally, and will
retain the active signal polarity for the PRTPWR[x:1] pins.
‘1’ = PRTPWR[x:1]_P/N pins have an active ‘high’ polarity
‘0’ = PRTPWR[x:1]_P/N pins have an active ‘low’ polarity
Warning: Active low port power controllers may glitch the downstream port
power when the system power is first applied. Care should be taken when
designing with active low components.
When PRTPWR_POL is not an available pin on the package, the hub will only
support active high power controllers.

OCS_N[x:1]

IPU

Over-Current Sense
Input from external current monitor indicating an over-current condition.

RBIAS

I-R

USB Transceiver Bias
A 12.0 kΩ (+/- 1%) resistor is attached from ground to this pin to set the
transceiver’s internal bias settings.

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Table 5.2 USB251x Pin Descriptions (continued)

SYMBOL

BUFFER
TYPE

DESCRIPTION
SERIAL PORT INTERFACES

SDA /

I/OSD12

Serial Data signal (SDA)
Server Message Block Data signal (SMBDATA)

SMBDATA /

Non-removable port strap option

NON_REM[1]

If this strap is enabled by package and configuration settings (see Table 8.1),
this pin will be sampled (in conjunction with LOCAL_PWR / SUSP_IND /
NON_REM[0]) at RESET_N negation to determine if ports [7:1] contain
permanently attached (non-removable) devices:
NON_REM[1:0] = ‘00’, All ports are removable.
NON_REM[1:0] = ‘01’, Port 1 is non-removable.
NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable.
NON_REM[1:0] = ‘11’, When available, ports 1 2 & 3 are non-removable.
RESET_N

IS

RESET Input
The system can reset the chip by driving this input low. The minimum active
low pulse is 1 μs.

SCL /

I/OSD12

System Management Bus Clock (SMBCLK)

SMBCLK /

Configuration Select: The logic state of this multifunction pin is internally
latched on the rising edge of RESET_N (RESET_N negation), and will
determine the hub configuration method as described in Table 8.1, "Hub
Configuration Options".

CFG_SEL[0]

HS_IND /

Serial Clock (SCL)

I/O12

Hi-Speed Upstream Port Indicator
HS_IND: Hi-speed Indicator for upstream port connection speed.
The active state of the LED will be determined as follows:
CFG_SEL[1] = ‘0’,
HS_IND is active high,
CFG_SEL[1] = ‘1’,
HS_IND is active low,
‘Asserted’ = the hub is connected at HS
‘Negated’ = the hub is connected at FS

CFG_SEL[1]

Configuration Programming Select
CFG_SEL[1]: The logic state of this pin is internally latched on the rising edge
of RESET_N (RESET_N negation), and will determine the hub configuration
method as described in Table 8.1, "Hub Configuration Options".

CFG_SEL[2]

I

Configuration Programming Select
The logic state of this pin is internally latched on the rising edge of RESET_N
(RESET_N negation), and will determine the hub configuration method as
described in Table 8.1, "Hub Configuration Options". When the CFG_SEL[2]
pin is unavailable, then the logic is internally tied to ‘0’.

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Table 5.2 USB251x Pin Descriptions (continued)

SYMBOL

BUFFER
TYPE

DESCRIPTION
MISC

XTALIN

ICLKx

Crystal Input
24 MHz crystal
This pin connects to either one terminal of the crystal or to an external
24 MHz clock when a crystal is not used.

CLKIN

External Clock Input
This pin connects to either one terminal of the crystal or to an external
24 MHz clock when a crystal is not used.

XTALOUT

OCLKx

Crystal Output
24 MHz Crystal
This is the other terminal of the crystal, or a no connect pin, when an external
clock source is used to drive XTALIN/CLKIN.

SUSP_IND /

I/O

Active/Suspend status LED
Suspend Indicator: Indicates USB state of the hub.
‘negated’ = Unconfigured, or configured and in USB Suspend
‘asserted’ = the hub is configured, and is active (i.e., not in suspend)

LOCAL_PWR /

Local Power: Detects availability of local self-power source.
Low = Self/local power source is NOT available (i.e., the hub gets all power
from Upstream USB VBus).
High = Self/local power source is available.

NON_REM[0]

NON_REM[0] Strap Option:
If this strap is enabled by package and configuration settings (see Table 8.1,
"Hub Configuration Options"), this pin will be sampled (in conjunction with
NON_REM[1]) at RESET_N negation to determine if ports [x:1] contain
permanently attached (non-removable) devices. Also, the active state of the
LED will be determined as follows:
NON_REM[1:0] = ‘00’, All ports are removable, and the LED is active high
NON_REM[1:0] = ‘01’, Port 1 is non-removable, and the LED is active low
NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable, and the LED is active
high
NON_REM[1:0] = ‘11’, When available, ports 1, 2 & 3 are non-removable, and
the LED is active low

TEST

IPD

TEST pin
User must treat as a no connect pin or connect to ground. No trace or signal
should be routed or attached to this pin.

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Table 5.2 USB251x Pin Descriptions (continued)

SYMBOL

BUFFER
TYPE

SEL48

I

DESCRIPTION
48 MHz Clock Input Selection
48 MHz external input clock select. When the hub is clocked from an external
clock source, this pin selects either 24 MHz or 48 MHz mode.
‘0’ = 24 MHz
‘1’ = 48 MHz
POWER, GROUND, and NO CONNECTS

CRFILT

VDD Core Regulator Filter Capacitor
This pin must have a 1.0 μF (or greater) ±20% (ESR <0.1
VSS.

VDD33

3.3 V Power

PLLFILT

PLL Regulator Filter Capacitor
This pin must have a 1.0 μF (or greater) ±20% (ESR <0.1
VSS.

VSS

Ω) capacitor to

Ω) capacitor to

Ground Pad / ePad
The package slug is the only VSS for the device and must be tied to ground
with multiple vias.

NC

No Connect
No signal or trace should be routed or attached to these pins.

5.3

Buffer Type Descriptions
Table 5.3 Buffer Type Descriptions
BUFFER
I

DESCRIPTION
Input.

I/O

Input/Output.

IPD

Input with internal weak pull-down resistor.

IPU

Input with internal weak pull-up resistor.

IS
O12

SMSC USB251x

Input with Schmitt trigger.
Output 12 mA.

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Table 5.3 Buffer Type Descriptions (continued)
BUFFER
I/O12
I/OSD12

DESCRIPTION
Input/Output buffer with 12 mA sink and 12 mA source.
Open drain with Schmitt trigger and 12 mA sink. Meets the I2C-Bus specification,
version 2.1, requirements.

ICLKx

XTAL clock input.

OCLKx

XTAL clock output.

I-R
I/O-U

Revision 1.0 (3-11-09)

RBIAS.
Analog Input/Output defined in USB specification.

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Chapter 6 LED Usage Description
6.1

LED Functionality
USB2513 and USB2514 (48-pin QFN only) and USB2517/17i SMSC hubs support two different
(mutually exclusive) LED modes. The ‘x’ represents the number of downstream ports. The USB mode
provides up to 14 LED’s that conform to the USB 2.0 specification functional requirements for Green
and Amber LED’s. The LED mode “speed indicator” provides the downstream device connection
speed.

6.1.1

USB Mode 14-Wire
The LED_A_N[x:1] pins are used to provide Green LED support as defined in the USB 2.0
specification. The LED_B_N[x:1] pins are used to provide Amber LED support as defined in the USB
2.0 specification. The USB specification defines the LED’s as port status indicators for the downstream
ports. Please note that no indication of port speed is possible in this mode. The pins are utilized as
follows:
LED_A_N[x:1] = Port [x:1] green LED
LED_B_N[x:1] = Port [x:1] amber LED

6.1.2

LED Mode Speed Indication
The LED_A[x:1]_N pins are used to provide connection status as well as port speed by using dual
color LED's. This scheme requires that the LED's be in the same package, and that a third color is
produced so that the user perceives both LED's as being driven "simultaneously".
The LED_A[x:1] pins used in this mode are connected to x number of dual color LED’s (each LED pair
in a single package). These pins indicate the USB speed of each attached downstream device.
Each dual color LED provides two separate colors (commonly Green and Red). If each of these
separate colors are pulsed on and off at a rapid rate, a user will see a third color (in this example,
Orange). Using this method, 4 different "color" states are possible (Green, Red, Orange, and Off).

3.3 V

General
Purpose
Diode
Connection to
other Dual Color
Diodes

D1A (Green LED)

Hub LED pin
Current Limiting
Resistor

D1B (Red LED)

Figure 6.1 Dual Color LED Implementation Example
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Figure 6.1 shows a simple example of how this LED circuit will be implemented. The circuit should be
replicated for each of the x LED pins on the SMSC hub. In this circuit, when the LED pin is driven to
a logic low state, the Green LED will light up. When the LED pin is driven to a Logic High state the
Red LED will light up. When a 1 KHz square wave is driven out on the LED pin, the Green and Red
LED's will both alternately light up giving the effect of the color Orange. When nothing is driven out on
the LED pin (i.e. the pin floats to a "tri-state" condition), neither the Green nor Red LED will light up,
this is the "Off" state.
The assignment is as follows:
LED_A_N[x:1] = LED D[x:1] (Downstream Port [x:1])
The usage is as follows:
LED_A_N[x] Driven to Logic Low = LS device attached (Green LED)
LED_A_N[x] Driven to Logic High = FS device attached (Red LED)
LED_A_N[x] Pulsed @ 1 KHz = HS device attached (Orange color by pulsing Red & Green).
LED_A_N[x] is tri-state= No devices are attached, or the hub is in suspend, LED's are off.

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Chapter 7 Battery Charging Support
7.1

General Description
The battery charging feature is only available in USB251xB (which represents USB2512B/3B/4B and
USB2512Bi/3Bi/4Bi hub family products). Any one or combination of downstream ports on the
USB251xB hub can be configured to support battery charging.
The SMSC hub provides support for battery charging devices on a per port basis in compliance with
the USB Battery Charging specification, version 1.1. The hub can be configured to individually enable
each downstream port for battery charging support either via pin strapping as illustrated in Figure 7.1
or by setting the corresponding configuration bits via EEPROM or SMBus.

3.3 V

5V

RSTRAP

USB Port Power
Controller
IN

PRTPWR[x]

USB251xB/xBi

OCS_N[x]

EN

VBUS

FLAG

Note: RSTRAP enables battery charging.
Figure 7.1 Battery Charging via External Power Supply

7.2

USB Battery Charging
A downstream port enabled for battery charging turns on port power as soon as the configuration
process has completed. The hub does not need to be enumerated nor does VBUS_DET need to be
asserted for the port power to be enabled. These conditions allow battery charging in S3, S4 and S5
system power states as well as in the fully operational state. The USB Battery Charging specification
does not interfere with standard USB operation, which allows a device to perform battery charging at
any time.
A port that supports battery charging must be able to support 1.5 amps of current on VBUS. Standard
USB port power controllers typically only allow for 0.8 amps of current before detecting an over-current
condition. Therefore, the 5 volt power supply, port power controller or over-current protection devices
must be chosen to handle the larger current demand compared to standard USB hub designs.

7.2.1

Special Behavior of PRTPWR Pins
The SMSC hub enables VBUS by asserting the port power (PRTPWR) pin as soon as the hardware
configuration process has completed. If the port detects an over-current condition, PRTPWR will be
turned off to protect the circuitry from overloading. If an over-current condition is detected when the
hub is not enumerated, PRTPWR can only be turned on from the host or if RESET_N is toggled. These

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behaviors provide battery charging even when the hub is not enumerated and protect the hub from
sustained short circuit conditions. If the short circuit condition persists when the hub is plugged into a
host system the user is notified that a port has an over-current condition. Otherwise the PRTPWR is
turned on by the host system and the port operates normally.

7.3

Battery Charging Configuration
Configuration of ports to support battery charging is done through a strap option on the corresponding
ports PRTPWR[x] / BC_EN[x] pin. see Chapter 5, Pin Descriptions, or through EEPROM or SMBus
configuration load.

7.3.1

Battery Charging enabled via EEPROM or SMBus
Register memory map location 0xD0 is allocated for battery charging support. The "Battery Charging"
register at location 0xD0 starting from Bit 1 enables battery charging for each downstream port when
asserted. Bit 1 represents port 1 and so on. Each port with battery charging enabled asserts the
corresponding PRTPWR[x:0] pin.

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Chapter 8 Configuration Options
8.1

Hub
SMSC’s USB 2.0 hub is fully specification compliant to the Universal Serial Bus specification, version
2.0, April 27, 2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 10 (Hub specification)
for general details regarding hub operation and functionality.
The hub provides 1 Transaction Translator (TT) that is shared by both downstream ports (defined as
Single-TT configuration), The TT contains 4 non-periodic buffers.

8.1.1

Hub Configuration Options
The SMSC hub supports a large number of features (some are mutually exclusive), and must be
configured in order to correctly function when attached to a USB host controller. There are three
principal ways to configure the hub: SMBus, EEPROM, or by internal default settings (with or without
configuration option over-rides). In all cases, the configuration method will be determined by the
CFG_SEL[2], CFG_SEL[1] and CFG_SEL[0] pins immediately after RESET_N negation. Please refer
to Table 8.1, "Hub Configuration Options" for more information.

8.1.2

SMBus or EEPROM Interface

Table 8.1 Hub Configuration Options
CFG_SEL[2]

CFG_SEL[1]

CFG_SEL[0]

0

0

0

Internal Default Configuration without any over-rides
„ Strap options enabled
„ Self-powered operation enabled
„ LED mode = Speed (when available on package)
„ Individual power switching
„ Individual over-current sensing

0

0

1

Configured as an SMBus slave for external download of
user-defined descriptors
„ Strap options disabled
„ All settings are controlled by registers as set by the user

0

1

0

Internal Default Configuration
„ Strap options enabled
„ Bus-powered operation
„ LED mode = USB (when available on package)
„ Individual power switching
„ Individual over-current sensing

0

1

1

2-Wire I2C EEPROMS are supported
„ Strap options disabled
„ All settings are controlled by registers as set by the user

SMSC USB251x

DESCRIPTION

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Table 8.1 Hub Configuration Options (continued)
CFG_SEL[2]

CFG_SEL[1]

CFG_SEL[0]

DESCRIPTION

1

0

0

Internal Default Configuration with the following over-rides
„ Dynamic power-switching enabled
„ Strap options disabled
„ LED mode = Speed (when available on package)
„ Individual power switching
„ Individual over-current sensing

1

0

1

Internal Default Configuration with the following over-rides
„ Dynamic setting enabled
„ Strap options disabled
„ LED mode = USB (when available on package)
„ Individual power switching
„ Individual over-current sensing

1

1

0

Internal Default Configuration with the following over-rides
„ Strap options disabled
„ LED mode = Speed (when available on package)
„ Individual power switching
„ Individual over-current sensing

1

1

1

Internal Default Configuration with the following over-rides
„ Strap options disabled
„ LED mode = USB (when available on package)
„ Ganged port power switching
„ Ganged over-current sensing

Note: When the CFG_SEL[2] pin is unavailable, then the logic is internally tied to ‘0’.

8.1.2.1

Power Switching Polarity
When the PRTPWR_POL pin is unavailable (3 and 4 port, 48-pin packages only), the hub only
supports “active high” port power controllers.

8.1.3

VBus Detect
According to Section 7.2.1 of the USB 2.0 specification, a downstream port can never provide power
to its D+ or D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state.
The VBUS_DET pin on the hub monitors the state of the upstream VBUS signal and will not pull-up
the D+ resistor if VBUS is not active. If VBUS goes from an active to an inactive state (Not Powered),
the hub will remove power from the D+ pull-up resistor within 10 seconds.

8.2

EEPROM Interface
The SMSC hub can be configured via a 2-wire (I2C) EEPROM (256x8). (Please see Table 8.1, "Hub
Configuration Options" for specific details on how to enable configuration via an I2C EEPROM).
The internal state-machine will (when configured for EEPROM support) read the external EEPROM for
configuration data. The hub will then “attach” to the upstream USB host.
Note: The hub does not have the capacity to write, or “Program,” an external EEPROM. The hub
only has the capability to read external EEPROMs. The external eeprom will be read (even if
it is blank or non-populated), and the hub will be “configured” with the values that are read.

Revision 1.0 (3-11-09)

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USB 2.0 Hi-Speed Hub Controller
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Please see the Internal Register Set (Common to EEPROM and SMBus) for a list of the available data
fields. Please visit www.smsc.com/ftpdocs/usb.html to locate the configuration utility for the hub
EEPROM data. Select the “e2prommap.msi” link to download the tool.
Each register has R/W capability. SMBUS and EEPROM Reset Values are 0x00. Reserved registers
should be written to ‘0’ unless otherwise specified. Contents read should be ignored (such as the case
of ‘R’ in the table below).

8.2.1

Internal Register Set (Common to EEPROM and SMBus)
Table 8.2 Internal Default, EEPROM and SMBus Register Memory Map

USB2513B/13Bi

USB2514B/14Bi

USB2517/17i

USB2512B/12Bi

USB2514/14i

USB2513/13i

USB2512/12i

USB2512A/12Ai

DEFAULT ROM VALUES (HEXIDECIMAL)

13

14

17

ADDRESS

REGISTER NAME

00h

Vendor ID LSB

24

01h

Vendor ID MSB

04

02h

Product ID LSB

03h

Product ID MSB

04h

Device ID LSB

00

A0

00

A0

00

05h

Device ID MSB

00

0A

00

0B

00

06h

Configuration Data Byte 1

07h

Configuration Data Byte 2

20

08h

Configuration Data Byte 3

02

09h

Non-Removable Devices

00

0Ah

Port Disable (Self)

08

00

0Bh

Port Disable (Bus)

08

00

0Ch

Max Power (Self)

01

0Dh

Max Power (Bus)

32

0Eh

Hub Controller Max Current (Self)

01

0Fh

Hub Controller Max Current (Bus)

32

10h

Power-on Time

32

11h

Language ID High

00

12h

Language ID Low

R

00

13h

Manufacturer String Length

R

00

14h

Product String Length

R

00

15h

Serial String Length

R

00

16h-53h

Manufacturer String

R

00

SMSC USB251x

12

13

14

12
25

8B

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Table 8.2 Internal Default, EEPROM and SMBus Register Memory Map (continued)

USB2517/17i

USB2514B/14Bi

USB2513B/13Bi

USB2512B/12Bi

USB2514/14i

USB2513/13i

USB2512/12i

USB2512A/12Ai

DEFAULT ROM VALUES (HEXIDECIMAL)

ADDRESS

REGISTER NAME

54h-91h

Product String

R

00

92h-CFh

Serial String

R

00

D0h

Battery Charging Enable

E0h

Reserved

F5h

Reserved

F6h

Boost_Up

F7h

Boost_7:5

F8h

Boost_x:0

00

F9h

Reserved

00

FAh

Port Swap

00

FBh

Port Map 12

00

FCh

Port Map 34

FDh

Port Map 56

R

00

FEh

Port Map 7

R

00

FFh

Status/Command
Note: SMBus register only

8.2.1.1

R

00
00

R

00

R

00

R

00

00
00

R

00

R

00

00

Register 00h: Vendor ID (LSB)

BIT
NUMBER

BIT NAME

DESCRIPTION

7:0

VID_LSB

Least Significant Byte of the Vendor ID. This is a 16-bit value that uniquely
identifies the Vendor of the user device (assigned by USB-Interface Forum).
This field is set by the OEM using either the SMBus or EEPROM interface
options.

8.2.1.2

Register 01h: Vendor ID (MSB)

BIT
NUMBER

BIT NAME

DESCRIPTION

7:0

VID_MSB

Most Significant Byte of the Vendor ID. This is a 16-bit value that uniquely
identifies the Vendor of the user device (assigned by USB-Interface Forum).
This field is set by the OEM using either the SMBus or EEPROM interface
options.

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8.2.1.3

Register 02h: Product ID (LSB)

BIT
NUMBER

BIT NAME

DESCRIPTION

7:0

PID_LSB

Least Significant Byte of the Product ID. This is a 16-bit value that the Vendor
can assign that uniquely identifies this particular product (assigned by OEM).
This field is set by the OEM using either the SMBus or EEPROM interface
options.

8.2.1.4

Register 03h: Product ID (MSB)

BIT
NUMBER

BIT NAME

DESCRIPTION

7:0

PID_MSB

Most Significant Byte of the Product ID. This is a 16-bit value that the Vendor
can assign that uniquely identifies this particular product (assigned by OEM).
This field is set by the OEM using either the SMBus or EEPROM interface
options.

8.2.1.5

Register 04h: Device ID (LSB)

BIT
NUMBER

BIT NAME

7:0

DID_LSB

8.2.1.6

DESCRIPTION
Least Significant Byte of the Device ID. This is a 16-bit device release
number in BCD format (assigned by OEM). This field is set by the OEM
using either the SMBus or EEPROM interface options.

Register 05h: Device ID (MSB)

BIT
NUMBER

BIT NAME

7:0

DID_MSB

SMSC USB251x

DESCRIPTION
Most Significant Byte of the Device ID. This is a 16-bit device release
number in BCD format (assigned by OEM). This field is set by the OEM
using either the SMBus or EEPROM interface options.

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8.2.1.7

Register 06h: CONFIG_BYTE_1

BIT
NUMBER

BIT NAME

7

SELF_BUS_PWR

DESCRIPTION
Self or Bus Power: Selects between Self- and Bus-Powered operation.
The hub is either self-powered (draws less than 2 mA of upstream bus
power) or bus-powered (limited to a 100 mA maximum of upstream power
prior to being configured by the host controller).
When configured as a bus-powered device, the SMSC hub consumes less
than 100 mA of current prior to being configured. After configuration, the buspowered SMSC hub (along with all associated hub circuitry, any embedded
devices if part of a compound device, and 100 mA per externally available
downstream port) must consume no more than 500 mA of upstream VBUS
current. The current consumption is system dependent, and the OEM must
ensure that the USB 2.0 specifications are not violated.
When configured as a self-powered device, <1 mA of upstream VBUS
current is consumed and all ports are available, with each port being capable
of sourcing 500 mA of current.
This field is set by the OEM using either the SMBus or EEPROM interface
options.
Please see the description under dynamic power for the self-/bus- power
functionality when dynamic power switching is enabled.
'0' = Bus-powered operation
’1’ = Self-powered operation
If dynamic power switching is enabled, this bit is ignored and the
LOCAL_PWR pin is used to determine if the hub is operating from self or
bus power.

6

Reserved

5

HS_DISABLE

Reserved
Hi-speed Disable: Disables the capability to attach as either a Hi-/Full-Speed
device, and forces attachment as Full-Speed only (i.e. no Hi-Speed support).
'0' = Hi-/Full-speed
‘1’ = Full-speed-Only (Hi-speed disabled!)

4

MTT_ENABLE

Multi-TT enable: Enables one transaction translator per port operation.
(Not available on the USB2512A/12Ai.)
Selects between a mode where only one transaction translator is available
for all ports (Single-TT), or each port gets a dedicated transaction translator
(Multi-TT).
'0' = Single TT for all ports
‘1’ = One TT per port (when multiple TT's are supported)

3

EOP_DISABLE

EOP Disable: Disables EOP generation at EOF1 when in Full-Speed mode.
During FS operation only, this permits the hub to send EOP if no
downstream traffic is detected at EOF1. See Section 11.3.1 of the USB 2.0
specification for additional details.
'0' = EOP generation is normal
‘1’ = EOP generation is disabled

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BIT
NUMBER

BIT NAME

2:1

CURRENT_SNS

DESCRIPTION
Over-Current Sense: Selects current sensing on a port-by-port basis, all
ports ganged, or none (only for bus-powered hubs). The ability to support
current sensing on a port or ganged basis is hardware implementation
dependent.
‘00’ = Ganged sensing (all ports together)
‘01’ = Individual (port-by-port)
‘1x’ = Over-current sensing not supported (must only be used with buspowered configurations!)

0

PORT_PWR

Port Power Switching: Enables power switching on all ports simultaneously
(ganged), or port power is individually switched on and off on a port- by-port
basis (individual). The ability to support power enabling on a port or ganged
basis is hardware implementation dependent.
‘0’ = Ganged switching (all ports together)
‘1’ = Individual port-by-port switching

8.2.1.8

Register 07h: Configuration Data Byte 2

BIT
NUMBER

BIT NAME

7

DYNAMIC

DESCRIPTION
Dynamic Power Enable: Controls the ability of the hub to automatically
change from self-powered operation to bus-powered operation if the local
power source is removed or is unavailable (and from bus-powered to selfpowered if the local power source is restored).
When dynamic power switching is enabled, the hub detects the availability
of a local power source by monitoring the external LOCAL_PWR pin. If the
hub detects a change in power source availability, the hub immediately
disconnects and removes power from all downstream devices and
disconnects the upstream port. The hub will then re-attach to the upstream
port as either a bus-powered hub (if local-power is unavailable) or a selfpowered hub (if local power is available).
‘0’ = No dynamic auto-switching
‘1’ = Dynamic auto-switching capable

6

Reserved

5:4

OC_TIMER

Reserved
OverCurrent Timer: Over-current Timer delay.
‘00’ = 0.1 ms
‘01’ = 4.0 ms
‘10’ = 8.0 ms
‘11’ = 16.0 ms

3

COMPOUND

Compound Device: Allows OEM to indicate that the hub is part of a
compound (see the USB specification for definition) device. The applicable
port(s) must also be defined as having a "Non-Removable Device".
Note:

When configured via strapping options, declaring a port as nonremovable automatically causes the hub controller to report that it
is part of a compound device.

‘0’ = No
‘1’ = Yes, The hub is part of a compound device
2:0

SMSC USB251x

Reserved

Reserved

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8.2.1.9

Register 08h: Configuration Data Byte 3

BIT
NUMBER

BIT NAME

7:4

Reserved

3

PRTMAP_EN

DESCRIPTION
Reserved
Port mapping enable: Selects the method used by the hub to assign port
numbers and disable ports.
‘0’ = Standard mode
‘1’ = Port mapping mode

2:1

LED_MODE

LED Mode Selection: The LED_A[x:1]_N and LED_B[x:1]_N pins support
several different modes of operation (depending upon OEM implementation
of the LED circuit).
‘00' = USB Mode
‘01’ = Speed Indication Mode
‘10’ = Same as ‘00’, USB Mode
‘11’ = Same as ‘00’, USB Mode
Warning: Do not enable an LED mode that requires LED pins that are not
available in the specific package being used in the implementation.
Note:

0

STRING_EN

The hub will only report that it supports LED's to the host when
USB mode is selected. All other modes will be reported as No LED
Support.

Enables String Descriptor Support
‘0’ = String support disabled
‘1’ = String support enabled

8.2.1.10

Register 09h: Non-Removable Device

BIT
NUMBER

BIT NAME

7:0

NR_DEVICE

DESCRIPTION
Non-removable Device: Indicates which port(s) include non-removable
devices.
‘0’ = port is removable
‘1’ = port is non-removable
Informs the host if one of the active ports has a permanent device that is
undetachable from the hub. (Note: The device must provide its own
descriptor data.)
When using the internal default option, the NON_REM[1:0] pins will
designate the appropriate ports as being non- removable.
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit

Revision 1.0 (3-11-09)

7=
6=
5=
4=
3=
2=
1=
0=

Controls Port
Controls Port
Controls Port
Controls Port
Controls Port
Controls Port
Controls Port
Reserved

7
6
5
4
3
2
1

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8.2.1.11

Register 0Ah: Port Disable For Self-Powered Operation

BIT
NUMBER

BIT NAME

7:0

PORT_DIS_SP

DESCRIPTION
Port Disable Self-Powered: Disables 1 or more ports.
0 = Port is available
1 = Port is disabled
During self-powered operation when mapping mode is disabled
(PRTMAP_EN='0'), this selects the ports which will be permanently disabled,
and are not available to be enabled or enumerated by a host controller. The
ports can be disabled in any order, the internal logic will automatically report
the correct number of enabled ports to the USB host, and will reorder the
active ports in order to ensure proper function.
When using the internal default option, the PRT_DIS_P[x:1] and
PRT_DIS_M[x:1] pins will disable the appropriate ports.
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit

8.2.1.12

7=
6=
5=
4=
3=
2=
1=
0=

Controls Port 7
Controls Port 6
Controls Port 5
Controls Port 4
Controls Port 3
Controls Port 2
Controls Port 1
Reserved, always = ‘0’

Register 0Bh: Port Disable For Bus-Powered Operation

BIT
NUMBER

BIT NAME

7:0

PORT_DIS_BP

DESCRIPTION
Port Disable Bus-Powered: Disables 1 or more ports.
0 = Port is available
1 = Port is disabled
During self-powered operation when mapping mode is disabled
(PRTMAP_EN='0'), this selects the ports which will be permanently disabled,
and are not available to be enabled or enumerated by a host Controller. The
ports can be disabled in any order, the internal logic will automatically report
the correct number of enabled ports to the USB host, and will reorder the
active ports in order to ensure proper function.
When using the internal default option, the PRT_DIS_P[x:1] and
PRT_DIS_M[x:1] pins will disable the appropriate ports.
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit

SMSC USB251x

7= Controls Port 7
6= Controls Port 6
5= Controls Port 5
4= Controls Port 4
3= Controls Port 3
2= Controls Port 2
1= Controls Port 1
0 is Reserved, always = ‘0’

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8.2.1.13

Register 0Ch: Max Power For Self-Powered Operation

BIT
NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_SP

Max Power Self_Powered: Value in 2 mA increments that the hub consumes
from an upstream port (VBUS) when operating as a self-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports 0
mA in its descriptors.
Note:

8.2.1.14

The USB 2.0 specification does not permit this value to exceed 100
mA

Register 0Dh: Max Power For Bus-Powered Operation

BIT
NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_BP

Max Power Bus_Powered: Value in 2 mA increments that the hub consumes
from an upstream port (VBUS) when operating as a bus-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports 0
mA in its descriptors.

8.2.1.15

Register 0Eh: Hub Controller Max Current For Self-Powered Operation

BIT
NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_SP

Hub Controller Max Current Self-Powered: Value in 2 mA increments that the
hub consumes from an upstream port (VBUS) when operating as a selfpowered hub. This value includes the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
Note:

The USB 2.0 specification does not permit this value to exceed 100
mA

A value of 50 (decimal) indicates 100 mA, which is the default value.

Revision 1.0 (3-11-09)

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8.2.1.16

Register 0Fh: Hub Controller Max Current For Bus-Powered Operation

BIT
NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_BP

Hub Controller Max Current Bus-Powered: Value in 2 mA increments that the
hub consumes from an upstream port (VBUS) when operating as a buspowered hub. This value will include the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value will NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
A value of 50 (decimal) would indicate 100 mA, which is the default value.

8.2.1.17

Register 10h: Power-On Time

BIT
NUMBER

BIT NAME

DESCRIPTION

7:0

POWER_ON_TIME

Power-On Time: The length of time that it takes (in 2 ms intervals) from the
time the host initiated power-on sequence begins on a port until power is
adequate on that port.

8.2.1.18

Register 11h: Language ID High

BIT
NUMBER

BIT NAME

7:0

LANG_ID_H

8.2.1.19

USB Language ID (Upper 8 bits of a 16-bit ID field)

Register 12h: Language ID Low

BIT
NUMBER

BIT NAME

7:0

LANG_ID_L

8.2.1.20

DESCRIPTION

DESCRIPTION
USB Language ID (Lower 8 bits of a 16-bit ID field)

Register 13h: Manufacturer String Length

BIT
NUMBER

BIT NAME

7:0

MFR_STR_LEN

DESCRIPTION
Manufacturer String Length
When supported, the maximum string length is 31 characters.

8.2.1.21

Register 14h: Product String Length

BIT
NUMBER

BIT NAME

7:0

PRD_STR_LEN

DESCRIPTION
Product String Length
When supported, the maximum string length is 31 characters.

SMSC USB251x

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8.2.1.22

Register 15h: Serial String Length

BIT
NUMBER

BIT NAME

7:0

SER_STR_LEN

DESCRIPTION
Serial String Length
When supported, the maximum string length is 31 characters.

8.2.1.23

Register 16h-53h: Manufacturer String

BIT
NUMBER

BIT NAME

7:0

MFR_STR

DESCRIPTION
Manufacturer String, UNICODE UTF-16LE per USB 2.0 specification
When supported, the maximum string length is 31 characters (62 bytes).
Note:

8.2.1.24

The string consists of individual 16-bit UNICODE UTF-16LE
characters. The Characters will be stored starting with the LSB at
the least significant address and the MSB at the next 8-bit location
(subsequent characters must be stored in sequential contiguous
address in the same LSB, MSB manner). Some EEPROM
programmers may transpose the MSB and LSB, thus reversing the
Byte order. Please pay careful attention to the Byte ordering or
your selected programming tools.

Register 54h-91h: Product String

BIT
NUMBER

BIT NAME

7:0

PRD_STR

DESCRIPTION
Product String, UNICODE UTF-16LE per USB 2.0 specification
When supported, the maximum string length is 31 characters (62 bytes).
Note:

Revision 1.0 (3-11-09)

The string consists of individual 16-bit UNICODE UTF-16LE
characters. The Characters will be stored starting with the LSB at
the least significant address and the MSB at the next 8-bit location
(subsequent characters must be stored in sequential contiguous
address in the same LSB, MSB manner). Some EEPROM
programmers may transpose the MSB and LSB, thus reversing the
Byte order. Please pay careful attention to the Byte ordering or
your selected programming tools.

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8.2.1.25

Register 92h-CFh: Serial String

BIT
NUMBER

BIT NAME

7:0

SER_STR

DESCRIPTION
Serial String, UNICODE UTF-16LE per USB 2.0 specification
When supported, the maximum string length is 31 characters (62 bytes).
Note:

8.2.1.26

The string consists of individual 16-bit UNICODE UTF-16LE
characters. The Characters will be stored starting with the LSB at
the least significant address and the MSB at the next 8-bit location
(subsequent characters must be stored in sequential contiguous
address in the same LSB, MSB manner). Some EEPROM
programmers may transpose the MSB and LSB, thus reversing the
Byte order. Please pay careful attention to the Byte ordering or
your selected programming tools.

Register D0h: Battery Charging Enable

BIT
NUMBER

BIT NAME

7:0

BC_EN

DESCRIPTION
Only available in USB251xB/Bi hub family products.
Battery Charging Enable: Enables the battery charging feature for the
corresponding port.
'0' = Battery Charging support is not enabled
'1' = Battery charging support is enabled
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit

8.2.1.27

7=
6=
5=
4=
3=
2=
1=
0=

Reserved
Reserved
Reserved
Controls Port
Controls Port
Controls Port
Controls Port
Reserved

4
3
2
1

Register F6h: Boost_Up

BIT
NUMBER

BIT NAME

7:2

Reserved

1:0

BOOST_IOUT

DESCRIPTION
Reserved
USB electrical signaling drive strength Boost Bit for the Upstream Port.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (~ 4% boost)
‘10’ = Elevated electrical drive strength = Medium (~ 8% boost)
‘11’ = Elevated electrical drive strength = High (~12% boost)
Note:

SMSC USB251x

“Boost” could result in non-USB Compliant parameters, OEM
should use a ‘00’ value unless specific implementation issues
require additional signal boosting to correct for degraded USB
signalling levels.

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8.2.1.28

Register F7h: Boost_7:5

BIT
NUMBER

BIT NAME

7:6

Reserved

5:4

BOOST_IOUT_7

DESCRIPTION
Reserved
USB electrical signaling drive strength Boost Bit for Downstream Port ‘7’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (~4% boost)
‘10’ = Elevated electrical drive strength = Medium (~ 8% boost)
‘11’ = Elevated electrical drive strength = High (~12% boost)

3:2

BOOST_IOUT_6

USB electrical signaling drive strength Boost Bit for Downstream Port ‘6’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (~4% boost)
‘10’ = Elevated electrical drive strength = Medium (~ 8% boost)
‘11’ = Elevated electrical drive strength = High (~12% boost)

1:0

BOOST_IOUT_5

USB electrical signaling drive strength Boost Bit for Downstream Port ‘5’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (~4% boost)
‘10’ = Elevated electrical drive strength = Medium (~ 8% boost)
‘11’ = Elevated electrical drive strength = High (~12% boost)

Note: “Boost” could result in non-USB Compliant parameters, OEM should use a ‘00’ value unless
specific implementation issues require additional signal boosting to correct for degraded USB
signalling levels.

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8.2.1.29

Register F8h: Boost_4:0

BIT
NUMBER

BIT NAME

7:6

BOOST_IOUT_4

DESCRIPTION
USB electrical signaling drive strength Boost Bit for Downstream Port ‘4’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (~4% boost)
‘10’ = Elevated electrical drive strength = Medium (~ 8% boost)
‘11’ = Elevated electrical drive strength = High (~12% boost)

5:4

BOOST_IOUT_3

USB electrical signaling drive strength Boost Bit for Downstream Port ‘3’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (~4% boost)
‘10’ = Elevated electrical drive strength = Medium (~ 8% boost)
‘11’ = Elevated electrical drive strength = High (~12% boost)

3:2

BOOST_IOUT_2

USB electrical signaling drive strength Boost Bit for Downstream Port ‘2’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (~4% boost)
‘10’ = Elevated electrical drive strength = Medium (~ 8% boost)
‘11’ = Elevated electrical drive strength = High (~12% boost)

1:0

BOOST_IOUT_1

USB electrical signaling drive strength Boost Bit for Downstream Port ‘1’.
‘00’ = Normal electrical drive strength = No boost
‘01’ = Elevated electrical drive strength = Low (~4% boost)
‘10’ = Elevated electrical drive strength = Medium (~ 8% boost)
‘11’ = Elevated electrical drive strength = High (~12% boost)

Note: “Boost” could result in non-USB Compliant parameters, OEM should use a ‘00’ value unless
specific implementation issues require additional signal boosting to correct for degraded USB
signalling levels.

8.2.1.30

Register FAh: Port Swap

BIT
NUMBER

BIT NAME

DESCRIPTION

7:0

PRTSP

Port Swap: Swaps the Upstream and Downstream USB DP and DM Pins for
ease of board routing to devices and connectors.
‘0’ = USB D+ functionality is associated with the DP pin and D- functionality
is associated with the DM pin.
‘1’ = USB D+ functionality is associated with the DM pin and D- functionality
is associated with the DP pin.
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit

SMSC USB251x

7=
6=
5=
4=
3=
2=
1=
0=

Controls Port
Controls Port
Controls Port
Controls Port
Controls Port
Controls Port
Controls Port
When this bit

7
6
5
4
3
2
1
is ‘1’, the upstream port DP/DM is swapped.

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8.2.1.31

Register FBh: PortMap 12

BIT
NUMBER

BIT NAME

7:0

PRTR12

DESCRIPTION
PortMap register for ports 1 & 2.
When a hub is enumerated by a USB host controller, the hub is only
permitted to report how many ports it has; the hub is not permitted to select
a numerical range or assignment. The host controller will number the
downstream ports of the hub starting with the number '1', up to the number
of ports that the hub reported having.
The host's port number is referred to as "Logical Port Number" and the
physical port on the hub is the “Physical Port Number". When mapping mode
is enabled (see PRTMAP_EN in Register 08h: Configuration Data Byte 3)
the hub's downstream port numbers can be mapped to different logical port
numbers (assigned by the host).
Note:

OEM must ensure that contiguous logical port numbers are used,
starting from #1 up to the maximum number of enabled ports; this
ensures that the hub's ports are numbered in accordance with the
way a host will communicate with the ports.
Table 8.3 PortMap Register for Ports 1 & 2
Bit [7:4]

Bit [3:0]

Revision 1.0 (3-11-09)

‘0000’

Physical Port 2 is Disabled

‘0001’

Physical Port 2 is mapped to Logical Port 1

‘0010’

Physical Port 2 is mapped to Logical Port 2

‘0011’

Physical Port 2 is mapped to Logical Port 3

‘0100’

Physical Port 2 is mapped to Logical Port 4

‘0101’

Physical Port 2 is mapped to Logical Port 5

‘0100’

Physical Port 2 is mapped to Logical Port 6

‘0111’

Physical Port 2 is mapped to Logical Port 7

‘1000’
to
‘1111’

Reserved, will default to ‘0000’ value

‘0000’

Physical Port 1 is Disabled

‘0001’

Physical Port 1 is mapped to Logical Port 1

‘0010’

Physical Port 1 is mapped to Logical Port 2

‘0011’

Physical Port 1 is mapped to Logical Port 3

‘0100’

Physical Port 1 is mapped to Logical Port 4

‘0101’

Physical Port 1 is mapped to Logical Port 5

‘0110’

Physical Port 1 is mapped to Logical Port 6

‘0111’

Physical Port 1 is mapped to Logical Port 7

‘1000’
to
‘1111’

Reserved, will default to ‘0000’ value

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8.2.1.32

Register FCh: PortMap 34

BIT
NUMBER

BIT NAME

7:0

PRTR34

DESCRIPTION
PortMap register for ports 3 & 4.
When a hub is enumerated by a USB host controller, the hub is only
permitted to report how many ports it has; the hub is not permitted to select
a numerical range or assignment. The host controller will number the
downstream ports of the hub starting with the number '1', up to the number
of ports that the hub reported having.
The host's port number is referred to as "Logical Port Number" and the
physical port on the hub is the “Physical Port Number". When mapping mode
is enabled (see PRTMAP_EN in Register 08h: Configuration Data Byte 3)
the hub's downstream port numbers can be mapped to different logical port
numbers (assigned by the host).
Note:

OEM must ensure that contiguous logical port numbers are used,
starting from #1 up to the maximum number of enabled ports; this
ensures that the hub's ports are numbered in accordance with the
way a host will communicate with the ports.
Table 8.4 PortMap Register for Ports 3 & 4
Bit [7:4]

Bit [3:0]

SMSC USB251x

‘0000’

Physical Port 4 is Disabled

‘0001’

Physical Port 4 is mapped to Logical Port 1

‘0010’

Physical Port 4 is mapped to Logical Port 2

‘0011’

Physical Port 4 is mapped to Logical Port 3

‘0100’

Physical Port 4 is mapped to Logical Port 4

‘0101’

Physical Port 4 is mapped to Logical Port 5

‘0100’

Physical Port 4 is mapped to Logical Port 6

‘0111’

Physical Port 4 is mapped to Logical Port 7

‘1000’
to
‘1111’

Reserved, will default to ‘0000’ value

‘0000’

Physical Port 3 is Disabled

‘0001’

Physical Port 3 is mapped to Logical Port 1

‘0010’

Physical Port 3 is mapped to Logical Port 2

‘0011’

Physical Port 3 is mapped to Logical Port 3

‘0100’

Physical Port 3 is mapped to Logical Port 4

‘0101’

Physical Port 3 is mapped to Logical Port 5

‘0110’

Physical Port 3 is mapped to Logical Port 6

‘0111’

Physical Port 3 is mapped to Logical Port 7

‘1000’
to
‘1111’

Reserved, will default to ‘0000’ value

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8.2.1.33

Register FDh: PortMap 56

BIT
NUMBER

BIT NAME

7:0

PRTR56

DESCRIPTION
PortMap register for ports 5 & 6.
When a hub is enumerated by a USB host controller, the hub is only
permitted to report how many ports it has; the hub is not permitted to select
a numerical range or assignment. The host controller will number the
downstream ports of the hub starting with the number '1', up to the number
of ports that the hub reported having.
The host's port number is referred to as "Logical Port Number" and the
physical port on the hub is the “Physical Port Number". When mapping mode
is enabled (see PRTMAP_EN in Register 08h: Configuration Data Byte 3)
the hub's downstream port numbers can be mapped to different logical port
numbers (assigned by the host).
Note:

OEM must ensure that contiguous logical port numbers are used,
starting from #1 up to the maximum number of enabled ports; this
ensures that the hub's ports are numbered in accordance with the
way a host will communicate with the ports.
Table 8.5 PortMap Register for Ports 5 & 6
Bit [7:4]

Bit [3:0]

Revision 1.0 (3-11-09)

‘0000’

Physical Port 6 is Disabled

‘0001’

Physical Port 6 is mapped to Logical Port 1

‘0010’

Physical Port 6 is mapped to Logical Port 2

‘0011’

Physical Port 6 is mapped to Logical Port 3

‘0100’

Physical Port 6 is mapped to Logical Port 4

‘0101’

Physical Port 6 is mapped to Logical Port 5

‘0100’

Physical Port 6 is mapped to Logical Port 6

‘0111’

Physical Port 6 is mapped to Logical Port 7

‘1000’
to
‘1111’

Reserved, will default to ‘0000’ value

‘0000’

Physical Port 5 is Disabled

‘0001’

Physical Port 5 is mapped to Logical Port 1

‘0010’

Physical Port 5 is mapped to Logical Port 2

‘0011’

Physical Port 5 is mapped to Logical Port 3

‘0100’

Physical Port 5 is mapped to Logical Port 4

‘0101’

Physical Port 5 is mapped to Logical Port 5

‘0110’

Physical Port 5 is mapped to Logical Port 6

‘0111’

Physical Port 5 is mapped to Logical Port 7

‘1000’
to
‘1111’

Reserved, will default to ‘0000’ value

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8.2.1.34

Register FEh: PortMap 7

BIT
NUMBER

BIT NAME

7:0

PRTR7

DESCRIPTION
PortMap register for port 7.
When a hub is enumerated by a USB host controller, the hub is only
permitted to report how many ports it has; the hub is not permitted to select
a numerical range or assignment. The host controller will number the
downstream ports of the hub starting with the number '1', up to the number
of ports that the hub reported having.
The host's port number is referred to as "Logical Port Number" and the
physical port on the hub is the “Physical Port Number". When mapping mode
is enabled (see PRTMAP_EN in Register 08h: Configuration Data Byte 3)
the hub's downstream port numbers can be mapped to different logical port
numbers (assigned by the host).
Note:

OEM must ensure that contiguous logical port numbers are used,
starting from #1 up to the maximum number of enabled ports; this
ensures that the hub's ports are numbered in accordance with the
way a host will communicate with the ports.
Table 8.6 PortMap Register for Port 7

SMSC USB251x

Bit [7:4]

‘0000’
to
‘1111’

Reserved

Bit [3:0]

‘0000’

Physical Port 7 is Disabled

‘0001’

Physical Port 7 is mapped to Logical Port 1

‘0010’

Physical Port 7 is mapped to Logical Port 2

‘0011’

Physical Port 7 is mapped to Logical Port 3

‘0100’

Physical Port 7 is mapped to Logical Port 4

‘0101’

Physical Port 7 is mapped to Logical Port 5

‘0110’

Physical Port 7 is mapped to Logical Port 6

‘0111’

Physical Port 7 is mapped to Logical Port 7

‘1000’
to
‘1111’

Reserved, will default to ‘0000’ value

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8.2.1.35

Register FFh: Status/Command

BIT
NUMBER

BIT NAME

7:3

Reserved

2

INTF_PW_DN

DESCRIPTION
Reserved
SMBus Interface Power Down
‘0’ = Interface is active
‘1’ = Interface power down after ACK has completed

1

RESET

Reset the SMBus Interface and internal memory back to RESET_N
assertion default settings.
‘0’ = Normal Run/Idle State
‘1’ = Force a reset of registers to their default state

0

USB_ATTACH

USB Attach (and write protect)
‘0’ = SMBus slave interface is active
‘1’ = The hub will signal a USB attach event to an upstream device, and the
internal memory (address range 00h-FEh) is “write-protected” to prevent
unintentional data corruption.

8.2.2

I2C EEPROM
The I2C EEPROM interface implements a subset of the I2C Master specification (Please refer to the
Philips Semiconductor Standard I2C-Bus specification for details on I2C bus protocols). The SMSC
hub’s I2C EEPROM interface is designed to attach to a single “dedicated” I2C EEPROM, and it
conforms to the Standard-mode I2C specification (100 kbit/s transfer rate and 7-bit addressing) for
protocol and electrical compatibility.
Note: Extensions to the I2C specification are not supported.
The hub acts as the master and generates the serial clock SCL, controls the bus access (determines
which device acts as the transmitter and which device acts as the receiver), and generates the START
and STOP conditions.

8.2.2.1

Implementation Characteristics
The hub will only access an EEPROM using the sequential read protocol.

8.2.2.2

Pull-Up Resistor
The circuit board designer is required to place external pull-up resistors (10 kΩ recommended) on the
SDA / SMBDATA & SCL / SMBCLK / CFG_SEL[0] lines (per SMBus 1.0 specification, and EEPROM
manufacturer guidelines) to VDD33 in order to assure proper operation.

8.2.2.3

I2C EEPROM Slave Address
The slave address is 1010000.
Note: 10-bit addressing is NOT supported.

8.2.3

In-Circuit EEPROM Programming
The EEPROM can be programmed via ATE (automatic test equipment) by pulling RESET_N low
(which tri-states the hub’s EEPROM interface and allows an external source to program the EEPROM).

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8.3

SMBus Slave Interface
Instead of loading User-Defined Descriptor data from an external EEPROM, the SMSC hub can be
configured to receive a code load from an external processor via an SMBus interface. The SMBus
interface shares the same pins as the EEPROM interface; if CFG_SEL[1] & CFG_SEL[0] activate the
SMBus interface, external EEPROM support is no longer available (and the user-defined descriptor
data must be downloaded via the SMBus). The SMSC hub waits indefinitely for the SMBus code load
to complete and only “appears” as a newly connected device on USB after the code load is complete.
The hub’s SMBus implementation is a slave-only SMBus device. The implementation only supports
read block and write block protocols. The hub responds to other protocols as described in Section
8.3.3, "Invalid Protocol Response Behavior," on page 54. Reference the System Management Bus
specification, Rev 1.0.
The SMBus interface is used to read and write the registers in the device. The register set is shown
in Section 8.2.1, "Internal Register Set (Common to EEPROM and SMBus)," on page 35.

8.3.1

SMBus Slave Addresses
The SMBus slave address is 58h (01011000b).

8.3.2

Bus Protocols
Typical Write Block and Read Block protocols are shown below. Register accesses are performed
using 7-bit slave addressing, an 8-bit register address field, and an 8-bit data field. The shading
indicates the hub driving data on the SMBDATA line; otherwise, host data is on the SDA/SMBDATA
line.
The slave address is the unique SMBus Interface Address for the hub that identifies it on SMBus. The
register address field is the internal address of the register to be accessed. The register data field is
the data that the host is attempting to write to the register or the contents of the register that the host
is attempting to read.
Note: Data bytes are transferred MSB first.

8.3.2.1

Block Read/Write
The block write begins with a slave address and a write condition. After the command code, the host
issues a byte count which describes how many more bytes will follow in the message. If a slave had
20 bytes to send, the first byte would be the number 20 (14h), followed by the 20 bytes of data. The
byte count may not be 0. A block read or write is allowed to transfer a maximum of 32 data bytes.
Note: For the following SMBus tables:

D e n o te s M a s te r-to -S la v e

D e n o te s S la v e -to -M a s te r

1

7

1

1

S

Slave Address

Wr

A

8

1

Register Address

A

...

8

1

8

1

8

1

8

1

1

Byte Count = N

A

Data byte 1

A

Data byte 2

A

Data byte N

A

P

Block Write
Figure 8.1 Block Write

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8.3.2.2

Block Read
A block read differs from a block write in that the repeated start condition exists to satisfy the I2C
specification’s requirement for a change in the transfer direction.

1
S

7
Slave Address

1

1

8

1

1

7

1

1

Wr

A

Register Address

A

S

Slave Address

Rd

A

...

8

1

8

1

8

1

8

1

1

Byte Count = N

A

Data byte 1

A

Data byte 2

A

Data byte N

A

P

Block Read

Figure 8.2 Block Read

8.3.3

Invalid Protocol Response Behavior
Registers that are accessed with an invalid protocol are not updated. A register is only updated
following a valid protocol. The only valid protocols are write block and read block, which are described
above. The hub only responds to the hardware selected Slave Address (0101100x).
Attempting to communicate with the hub over SMBus with an invalid slave address or invalid protocol
results in no response, and the SMBus Slave Interface returns to the idle state.
The only valid registers that are accessible by the SMBus slave address are the registers defined in
the Registers Section. The hub does not respond to undefined registers.

8.3.4

General Call Address Response
The hub does not respond to a general call address of 0000_000b.

8.3.5

Slave Device Time-Out
According to the SMBus specification, version 1.0 devices in a transfer can abort the transfer in
progress and release the bus when any single clock low interval exceeds 25 ms (TTIMEOUT, MIN).
Devices that have detected this condition must reset their communication and be able to receive a new
START condition no later than 35 ms (TTIMEOUT, MAX).
Note: Some simple devices do not contain a clock low drive circuit; this simple kind of device typically
resets its communications port after a start or stop condition. The slave device time-out must
be implemented.

8.3.6

Stretching the SCLK Signal
The hub supports stretching of the SCLK by other devices on the SMBus. The hub does not stretch
the SCLK.

8.3.7

SMBus Timing
The SMBus Slave Interface complies with the SMBus AC Timing specification. See the SMBus timing
in the “Timing Diagram” section.

8.3.8

Bus Reset Sequence
The SMBus slave interface resets and returns to the idle state upon a START field followed
immediately by a STOP field.

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8.3.9

SMBus Alert Response Address
The SMBALERT# signal is not supported by the hub.

8.3.9.1

Undefined Registers
The registers shown in Table 8.2 are the defined registers in the hub. Reads to undefined registers
return 00h. Writes to undefined registers have no effect and do not return an error.

8.3.9.2

Reserved Registers
Reserved registers should be written to ‘0’ unless otherwise specified. Contents read should be
ignored.

8.4

Default Configuration Option:
To configure the SMSC hub in its default configuration, strap CFG_SEL[2:0] to 00h. This procedure
configures the hub to the internal defaults and enables the strapping options. Please see Section 8.2.1,
"Internal Register Set (Common to EEPROM and SMBus)" for the list of the default values. For specific
pin strapping options, please see Chapter 5, Pin Descriptions for instructions on how to modify the
default values. Options include port disable and non-removable pin strapping.

8.5

Default Strapping Options:
The USB251x can be configured via a combination of internal default values and pin strap options.
Please see Table 8.2 for specific details on how to enable the default/pin-strap configuration option.
The strapping option pins only cover a limited sub-set of the configuration options. The internal default
values will be used for the bits & registers that are not controlled by a strapping option pin. Please
refer to Table 8.2 for the internal default values that are loaded when this option is selected.

8.6

Reset
There are two different resets that the hub experiences. One is a hardware reset via the RESET_N
pin and the second is a USB Bus Reset.

8.6.1

External Hardware RESET_N
A valid hardware reset is defined as assertion of RESET_N for a minimum of 1 μs after all power
supplies are within operating range. While reset is asserted, the hub (and its associated external
circuitry) consumes less than 500 μA of current from the upstream USB power source.
Assertion of RESET_N (external pin) causes the following:
1. All downstream ports are disabled, and PRTPWR power to downstream devices is removed (unless
BC_EN is enabled).
2. The PHYs are disabled, and the differential pairs will be in a high-impedance state.
3. All transactions immediately terminate; no states are saved.
4. All internal registers return to the default state (in most cases, 00(h)).
5. The external crystal oscillator is halted.
6. The PLL is halted.
The hub is “operational” 500 μs after RESET_N is negated. Once operational, the hub immediately
reads OEM-specific data from the external EEPROM (if the SMBus option is not disabled).

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8.6.1.1

RESET_N for Strapping Option Configuration
Hardware
reset
asserted

Drive Strap
Outputs to
inactive
levels

Read Strap
Options

t1

Attach
USB
Upstream

USB Reset
recovery

t7

t6

t5

Start
completion
request
response

Idle

t8

t2
t3

RESET_N

VSS

t4

Strap Pins
Don’t Care

Valid

Driven by Hub if strap is an output.

Don’t Care

VSS

Figure 8.3 Reset_N Timing for Default/Strap Option Mode
Table 8.7 Reset_N Timing for Default/Strap Option Mode
NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

1

μsec

Strap Setup Time

16.7

nsec

t3

Strap Hold Time.

16.7

t4

hub outputs driven to inactive logic states

t5

USB Attach (See Note).

t6

Host acknowledges attach and signals USB
Reset.

t7

USB Idle.

t8

Completion time for requests (with or without data
stage).

t1

RESET_N Asserted.

t2

1.5

1400

nsec

2

μsec

100

msec

100

msec
undefined

msec
5

msec

Notes:
„

When in bus-powered mode, the hub and its associated circuitry must not consume more than 100
mA from the upstream USB power source during t1+t5.

„

All power supplies must have reached the operating levels mandated in Chapter 9, DC Parameters,
prior to (or coincident with) the assertion of RESET_N.

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8.6.1.2

RESET_N for EEPROM Configuration
Hardware
reset
asserted

Read Strap
Options

Read EEPROM
+
Set Options

Attach
USB
Upstream

USB Reset
recovery

Start
completion
request
response

Idle

t4
t1

t2

t6

t5

t3

t7

RESET_N

VSS

Figure 8.4 Reset_N Timing for EEPROM Mode
Table 8.8 Reset_N Timing for EEPROM Mode
NAME

DESCRIPTION

MIN

t1

RESET_N Asserted.

t2

Hub Recovery/Stabilization.

t3

EEPROM Read / Hub Config.

t4

USB Attach (See Note).

t5

Host acknowledges attach and signals USB
Reset.

t6

USB Idle.

t7

Completion time for requests (with or without data
stage).

TYP

MAX

UNITS
μsec

1

2.0

500

μsec

99.5

msec

100

msec

100

msec
undefined

msec
5

msec

Notes:
„

When in bus-powered mode, the hub and its associated circuitry must not consume more than 100
mA from the upstream USB power source during t4+t5+t6+t7.

„

All power supplies must have reached the operating levels mandated in Chapter 9, DC Parameters,
prior to (or coincident with) the assertion of RESET_N.

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RESET_N for SMBus Slave Configuration

8.6.1.3

Hardware
reset
asserted

Reset
Negation

SMBus Code
Hub PHY
Load
Stabilization

t1

t2

Attach
USB
Upstream

USB Reset
recovery

t6

t5

t4

t3

Start
completion
request
response

Idle

t7

RESET_N

VSS

Figure 8.5 Reset_N Timing for SMBus Mode
Table 8.9 Reset_N Timing for SMBus Mode
NAME

DESCRIPTION

MIN

t1

RESET_N Asserted.

t2

Hub Recovery/Stabilization.

t3

SMBus Code Load (See Note).

t4

Hub Configuration and USB Attach.

t5

Host acknowledges attach and signals USB
Reset.

t6

USB Idle.

t7

Completion time for requests (with or without data
stage).

TYP

MAX

UNITS
μsec

1

250

500

μsec

300

msec

100

msec

100

msec
Undefined

msec
5

msec

Notes:

8.6.2

„

For bus-powered configurations, the 99.5 ms (MAX) is required, and the hub and its associated
circuitry must not consume more than 100 mA from the upstream USB power source during
t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load
the configuration is determined by the external SMBus host.

„

All power supplies must have reached the operating levels mandated in Chapter 9, DC Parameters,
prior to (or coincident with) the assertion of RESET_N.

USB Bus Reset
In response to the upstream port signaling a reset to the hub, the hub does the following:
Note: The hub does not propagate the upstream USB reset to downstream devices.
1. Sets default address to 0.
2. Sets configuration to: Unconfigured.
3. Negates PRTPWR[x:1] to all downstream ports unless battery charging (BC_EN) is enabled.
4. Clears all TT buffers.
5. Moves device from suspended to active (if suspended).

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6. Complies with Section 11.10 of the USB 2.0 specification for behavior after completion of the reset
sequence. The host then configures the hub and the hub’s downstream port devices in accordance
with the USB specification.
Note: The hub does not propagate the upstream USB reset to downstream devices.

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Datasheet

Chapter 9 DC Parameters
9.1

Maximum Guaranteed Ratings

PARAMETER

SYMBOL

MIN

MAX

UNITS

Storage
Temperature

TSTOR

-55

150

°C

Lead
Temperature
3.3 V supply
voltage

Refer to JEDEC Specification J-STD020D.
VDD33
PLLFILT
CRFILT

4.6

V

Voltage on any
I/O pin

-0.5

5.5

V

Voltage on
XTALIN

-0.5

4.0

V

Voltage on
XTALOUT

-0.5

2.5

V

9.2

COMMENTS

Applies to all parts.

Note 9.1

Stresses above the specified parameters could cause permanent damage to the device.
This is a stress rating only and functional operation of the device at any condition above
those indicated in the operation sections of this specification is not implied.

Note 9.2

When powering this device from laboratory or system power supplies, it is important that
the absolute maximum ratings not be exceeded or device failure can result. Some power
supplies exhibit voltage spikes on their outputs when the AC power is switched on or off.
In addition, voltage transients on the AC power line may appear on the DC output. When
this possibility exists, it is suggested that a clamp circuit be used.

Operating Conditions

PARAMETER

SYMBOL

MIN

MAX

UNITS

COMMENTS

Commercial
Operating
Temperature

TA

0

70

°C

Ambient temperature in still air.
Only applies to USB251x, USB251xA,
and USB251xB products.

Industrial
Operating
Temperature

TAI

-40

85

°C

Ambient temperature in still air.
Only applies to USB251xi,
USB251xAi, and USB251xBi
products.

3.3 V supply voltage

VDD33

3.0

3.6

V

Applies to all parts.

3.3 V supply rise
time

tRT

0

400

μs

See Figure 9.1

-0.3

5.5

V

If any 3.3 V supply voltage drops
below 3.0 V, then the MAX becomes:

Voltage on any I/O
pin

(3.3 V supply voltage) + 0.5
Voltage on XTALIN
Revision 1.0 (3-11-09)

-0.3

VDD33
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DATASHEET

V
SMSC USB251x

USB 2.0 Hi-Speed Hub Controller
Datasheet

Voltage

tRT

VDD33

3.3 V

100%

90%

VSS

10%

t90%

t10%

Time

Figure 9.1 Supply Rise Time Model
Table 9.1 DC Electrical Characteristics
PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

0.8

V

COMMENTS

I, IS Type Input Buffer
Low Input Level

VILI

High Input Level

VIHI

2.0

IIL

-10

+10

μA

VHYSI

250

350

mV

0.8

V

Input Leakage
Hysteresis (‘IS’ Only)

TTL Levels

V
VIN = 0 to VDD33

Input Buffer with Pull-Up (IPU)
Low Input Level
High Input Level
Low Input Leakage
High Input Leakage

VILI

TTL Levels

VIHI

2.0

V

IILL

+35

+90

μA

VIN = 0

IIHL

-10

+10

μA

VIN = VDD33

0.8

V

TTL Levels

Input Buffer with Pull-Down (IPD)
Low Input Level
High Input Level
Low Input Leakage
High Input Leakage

VILI
VIHI

2.0

V

IILL

+10

-10

μA

VIN = 0

IIHL

-35

-90

μA

VIN = VDD33

0.5

V

ICLK Input Buffer
Low Input Level

VILCK

High Input Level

VIHCK

1.4

IIL

-10

Input Leakage

SMSC USB251x

61

DATASHEET

V
+10

μA

VIN = 0 to VDD33

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USB 2.0 Hi-Speed Hub Controller
Datasheet

Table 9.1 DC Electrical Characteristics (continued)
PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

0.4

V

COMMENTS

O12, I/O12 &I/OSD12 Type Buffer
Low Output Level
High Output Level
Output Leakage
Hysteresis (‘SD’ pad only)

VOL

V

IOL = 12 mA @
VDD33 = 3.3 V

VOH

2.4

IOL

-10

+10

μA

IOH = -12 mA @
VDD33 = 3.3 V

VHYSC

250

350

mV

VIN = 0 to VDD33
(Note 9.1)

IO-U
(Note 2)
Supply Current Unconfigured
Hi-Speed Host

USB2512/12A/12B

ICCINTHS

90

95

mA

USB2512i/12Ai/12Bi

ICCINTHS

90

95

mA

USB2513/13B

ICCINTHS

95

105

mA

USB2513i/13Bi

ICCINTHS

95

105

mA

USB2514/14B

ICCINTHS

95

105

mA

USB2514i/14Bi

ICCINTHS

95

105

mA

USB2517

ICCINTHS

120

130

mA

USB2517i

ICCINTHS

120

130

mA

USB2512/12A/12B

ICCINITFS

80

85

mA

USB2512i/12Ai/12Bi

ICCINITFS

80

85

mA

USB2513/13B

ICCINITFS

80

90

mA

USB2513i/13Bi

ICCINITFS

80

90

mA

USB2514/14B

ICCINITFS

80

90

mA

USB2514i/14Bi

ICCINITFS

80

90

mA

USB2517

ICCINITFS

105

115

mA

USB2517i

ICCINITFS

105

115

mA

Supply Current Unconfigured
Full-Speed Host

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USB 2.0 Hi-Speed Hub Controller
Datasheet

Table 9.1 DC Electrical Characteristics (continued)
PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

COMMENTS

Supply Current Configured

Hi-Speed Host, 1 downstream port

USB2512/12A/12B

IHCH1

130

155

mA

USB2512i/12Ai/12Bi

IHCH1

130

160

mA

USB2513/13B

IHCH1

150

180

mA

USB2513i/13Bi

IHCH1

150

185

mA

USB2514/14B

IHCH1

155

200

mA

USB2514i/14Bi

IHCH1

155

205

mA

USB2517

IHCH1

240

275

mA

USB2517i

IHCH1

240

280

mA

1 port
base

1 port
base

+

+

15 mA

40 mA

Supply Current Configured

Hi-Speed Host, each additional
downstream port

mA

Supply Current Configured

Full-Speed Host, 1 downstream port

USB2512/12A/12B

IFCC1

105

125

mA

USB2512i/12Ai/12Bi

IFCC1

105

135

mA

USB2513/13B

IFCC1

125

135

mA

USB2513i/13Bi

IFCC1

125

140

mA

USB2514/14B

IFCC1

140

150

mA

USB2514i/14Bi

IFCC1

140

155

mA

USB2517

IFCC1

215

220

mA

USB2517i

IFCC1

215

225

mA

1 port
base

1 port
base

+

+

0 mA

0 mA

Supply Current Configured

Full-Speed Host, each additional
downstream port

SMSC USB251x

63

DATASHEET

mA

There is no
additional current for
additional ports.

Revision 1.0 (3-11-09)

USB 2.0 Hi-Speed Hub Controller
Datasheet

Table 9.1 DC Electrical Characteristics (continued)
PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

Supply Current Suspend
USB2512/12A/12B

ICSBY

310

420

μA

USB2512i/12Ai/12Bi

ICSBY

310

600

μA

USB2513/13B

ICSBY

310

420

μA

USB2513i/13Bi

ICSBY

310

550

μA

USB2514/14B

ICSBY

310

420

μA

USB2514i/14Bi

ICSBY

310

600

μA

USB2517

ICSBY

310

610

μA

USB2517i

ICSBY

310

800

μA

USB2512/12A/12B

ICRST

105

275

μA

USB2512i/12Ai/12Bi

ICRST

105

400

μA

USB2513/13B

ICRST

100

230

μA

USB2513i/13Bi

ICRST

100

350

μA

USB2514/14B

ICRST

100

275

μA

USB2514i/14Bi

ICRST

100

400

μA

USB2517

ICRST

115

320

μA

USB2517i

ICRST

115

600

μA

Supply Current Reset

COMMENTS
All supplies
combined

All supplies
combined

Note 9.3

Output leakage is measured with the current pins in high impedance.

Note 9.4

See USB 2.0 specification for USB DC electrical characteristics.

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USB 2.0 Hi-Speed Hub Controller
Datasheet

Table 9.2 Pin Capacitance
LIMITS
PARAMETER
Clock Input
Capacitance
Input Capacitance
Output Capacitance
Note 9.5

SMSC USB251x

SYMBOL

MIN

TYP

MAX

UNIT

TEST CONDITION

CXTAL

2

pF

All pins except USB pins and the pins
under the test tied to AC ground.

CIN

10

pF

(See Note 9.5)

COUT

20

pF

Capacitance TA = 25°C; fc = 1 MHz; VDD33 = 3.3 V

65

DATASHEET

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Datasheet

Chapter 10 AC Specifications
10.1

Oscillator/Clock
Crystal: Parallel Resonant, Fundamental Mode, 24/481 MHz ±350 ppm.
External Clock: 50% Duty cycle ± 10%, 24/48 MHz ± 350 ppm, Jitter < 100 ps rms.

XTAL1
(CS1 = CB + CXTAL )

C1

Crystal

1 Meg

CL

C2

XTAL2
(CS2 = CB + CXTAL )
Figure 10.1 Typical Crystal Circuit

Note: CB equals total board/trace capacitance.

(C1 + CS1) x (C2 + CS2)
CL =

(C1 + CS1 + C2 + CS2)

Figure 10.2 Formula to Find the Value of C1 and C2

C = (2 x CL) - Cs
Figure 10.3 Simplified Form of the Capacitance Formula

10.1.1

SMBus Interface:
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the SMBus 1.0 specification for Slave-Only devices (except as noted in Section 8.3).

10.1.2

I2C EEPROM:
Clock frequency is fixed at 60 KHz ± 20%.

10.1.3

USB 2.0
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the USB 2.0 specification. Please refer to the USB 2.0 specification for more information.

1.Only when SEL48 is available and supported.

Revision 1.0 (3-11-09)

66

DATASHEET

SMSC USB251x

USB 2.0 High-Speed 2-Port Hub Controller

67

DATASHEET

SMSC USB251x

Figure 11.1 36-Pin QFN, 6x6 mm Body, 0.5 mm Pitch

Datasheet

Revision 1.0 (3-11-09)

Chapter 11 Package Outlines

USB 2.0 High-Speed 2-Port Hub Controller
Datasheet

Revision 1.0 (3-11-09)

68

DATASHEET

SMSC USB251x

Figure 11.2 48-Pin QFN, 7x7 mm Body, 0.5 mm Pitch

USB 2.0 High-Speed 2-Port Hub Controller
Datasheet

Revision 1.0 (3-11-09)

69

DATASHEET

SMSC USB251x

Figure 11.3 64-Pin QFN, 9x9 mm Body, 0.5 mm Pitch

USB 2.0 Hi-Speed Hub Controller

Datasheet

11.1

Tape and Reel Specifications

Figure 11.4 36-Pin Package Tape Specifications

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SMSC USB251x

USB 2.0 Hi-Speed Hub Controller

Datasheet

Figure 11.5 48-Pin Package Tape Specifications

SMSC USB251x

71

DATASHEET

Revision 1.0 (3-11-09)

USB 2.0 Hi-Speed Hub Controller

Datasheet

Figure 11.6 36-Pin and 48-Pin Package Reel Specifications

Revision 1.0 (3-11-09)

72

DATASHEET

SMSC USB251x



---

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Format                          : application/pdf
Creator                         : .
Title                           : USB2512/USB2512A/USB2512B, USB2513/USB2513B, USB2514/USB2514B, USB2517 USB 2.0 Hi-Speed Hub Controller - SMSC
Description                     : USB251x Hub Family
Document ID                     : uuid:da23307b-0e63-4968-abb8-d67bb93f84e3
Instance ID                     : uuid:fa378247-d9f0-4952-abb0-83ffe80d9e45
Page Count                      : 72
Subject                         : USB251x Hub Family

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