SMSC USB2513 User Manual
USB2512/12A/12B
USB2513/13B
USB2514/14B
USB2517
USB 2.0 Hi-Speed
Hub Controller
PRODUCT FEATURES
General Description
The SMSC USB251x hub is a family of low-power, OEM
configurable, MTT (multi transaction translator)
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 I
SMBus slave port
MultiTRAK
— High-performance multiple transaction translator which
PortMap
— Flexible port mapping and disable sequencing
PortSwap
— Programmable USB differential-pair pin locations ease
PHYBoost
— Programmable USB signal drive strength for recovering
TM
provides one transaction translator per port
PCB design by aligning USB signal lines directly to
connectors
signal integrity using 4-level driving strength resolution
2C®
EEPROM, or
1
hub
Datasheet
Features
Full power management with individual or ganged
power control of each downstream port
Fully integrated USB termination and pull-up/pull-
down 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
USB251xB
2
and USB251xBi products support the
USB Battery Charging specification
Lead-free RoHS compliant packages:
— 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
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
1.USB2512A/Ai only uses a single transaction translator.
SMSC USB251x Hub Family DATASHEET Revision 1.0 (3-11-09)
serves as a preliminary product preview.
ORDER NUMBERS
ORDER NUMBERS:
LEAD-FREE
ROHS COMPLIANT
PACKAGE PACKAGE SIZE
USB 2.0 Hi-Speed Hub Controller
Datasheet
TEMPERATURE
RANGE
USB2512-AEZG
USB2512A-AEZG
USB2512B-AEZG
USB2513-AEZG
USB2513B-AEZG
USB2514-AEZG
USB2514B-AEZG
USB2512i-AEZG
USB2512Ai-AEZG
USB2512Bi-AEZG
USB2513i-AEZG
USB2513Bi-AEZG
USB2514i-AEZG
USB2514Bi-AEZG
USB2513-HZH
USB2514-HZH
USB2517-JZX
USB2517i-JZX
Note: USB251xB/USB251xBi products have not yet been released. They
36QFN 6 x 6 x 0.5 mm 0ºC to 70ºC
36QFN 6 x 6 x 0.5 mm -40ºC to 85ºC
48QFN 7 x 7 x 0.5 mm 0ºC to 70ºC
64QFN 9 x 9 x 0.5 mm 0ºC to 70ºC
64QFN 9 x 9 x 0.5 mm -40ºC to 85ºC
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 SMSC USB251x
DATASHEET
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 Pin Configurations and Lists (Organized by Package Type) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 USB251x Pin Descriptions (Grouped by Function). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3 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 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.2 USB Battery Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.2.1 Special Behavior of PRTPWR Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.3 Battery Charging Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.3.1 Battery Charging enabled via EEPROM or SMBus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Chapter 8 Configuration Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.1 Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.1.1 Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.1.2 SMBus or EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.1.3 VBus Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.2 EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.2.1 Internal Register Set (Common to EEPROM and SMBus) . . . . . . . . . . . . . . . . . . . . . . . 35
8.2.2 I
8.2.3 In-Circuit EEPROM Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8.3 SMBus Slave Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.3.1 SMBus Slave Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.3.2 Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.3.3 Invalid Protocol Response Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.3.4 General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.3.5 Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.3.6 Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.3.7 SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.3.8 Bus Reset Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.3.9 SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8.4 Default Configuration Option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8.5 Default Strapping Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8.6 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8.6.1 External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8.6.2 USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
2
C EEPROM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Chapter 9 DC Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
SMSC USB251x 3 Revision 1.0 (3-11-09)
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
9.1 Maximum Guaranteed Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.2 Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Chapter 10 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.1 Oscillator/Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.1.1 SMBus Interface: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.1.2 I
2
C EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.1.3 USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Chapter 11 Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
11.1 Tape and Reel Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Revision 1.0 (3-11-09) 4 SMSC USB251x
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
List of Tables
Table 1.1 36-pin QFN (6x6x0.5 mm) RoHS Compliant Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 1.2 48-pin QFN (7x7x0.5 mm) RoHS Compliant Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 1.3 64-pin QFN (9x9x0.5 mm) RoHS Compliant Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5.1 Pin List in Alphabetical Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 5.2 USB251x Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 5.3 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 8.1 Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 8.2 Internal Default, EEPROM and SMBus Register Memory Map . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 8.3 PortMap Register for Ports 1 & 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 8.4 PortMap Register for Ports 3 & 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 8.5 PortMap Register for Ports 5 & 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 8.6 PortMap Register for Port 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 8.7 Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 8.8 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 8.9 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Table 9.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Table 9.2 Pin Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
SMSC USB251x 5 Revision 1.0 (3-11-09)
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
List of Figures
Figure 4.1 USB251x Hub Family Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5.1 2-Port 36-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5.2 3-Port 36-pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 5.3 4-Port 36-pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 5.4 3-Port 48-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 5.5 4-Port 48-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 5.6 7-Port 64-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 6.1 Dual Color LED Implementation Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 7.1 Battery Charging via External Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 8.1 Block Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 8.2 Block Read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 8.3 Reset_N Timing for Default/Strap Option Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 8.4 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 8.5 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Figure 9.1 Supply Rise Time Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 10.1 Typical Crystal Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 10.2 Formula to Find the Value of C1 and C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 10.3 Simplified Form of the Capacitance Formula . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 11.1 36-Pin QFN, 6x6 mm Body, 0.5 mm Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Figure 11.2 48-Pin QFN, 7x7 mm Body, 0.5 mm Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 11.3 64-Pin QFN, 9x9 mm Body, 0.5 mm Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Figure 11.4 36-Pin Package Tape Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Figure 11.5 48-Pin Package Tape Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Figure 11.6 36-Pin and 48-Pin Package Reel Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Revision 1.0 (3-11-09) 6 SMSC USB251x
DATASHEET
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
USB2512
USB2512A
USB2512B
USB2512i
USB2512Bi
USB2512Ai
USB2513
USB2513B
USB2513i
USB2513Bi
USB2514
USB2514B
USB2514i
USB2514Bi
Downstream
ports
Table 1.2 48-pin QFN (7x7x0.5 mm) RoHS Compliant Part Numbers
Part
Number
USB2513 3
Downstream
ports
2
2
3
3
4
4
Default TTTru e
multi**
multi**
multi
multi
multi
multi
Default TTTru e
multi
Speed
Speed
3324/48 3
Battery
Charging
3*
3*
3*
3*
3*
3*
Battery
Charging
LED Port
Indicators
LED Port
Indicators
Clock
(MHz)
24
24
24
24
24
24
Clock
(MHz)
0ºC
to
70ºC
3
3
3
0ºC
70ºC
to
-40ºC
to
85ºC
3
3
3
-40ºC
to
85ºC
USB2514 4
multi
3324/48 3
Table 1.3 64-pin QFN (9x9x0.5 mm) RoHS Compliant Part Numbers
Part
Number
USB2517 7
USB2517i
Down-
stream
ports
7
Default TTTrue
multi
multi
Speed
3324 3
3324 3
Battery
Charging
LED Port
Indicators
Clock
(MHz)
0ºC
to
70ºC
Note 1.1 *Battery charging enable is only available on USB251x/xBi products.
Note 1.2 **USB2512A/Ai only uses a single transaction translator.
-40ºC
to
85ºC
SMSC USB251x 7 Revision 1.0 (3-11-09)
DATASHEET
Chapter 2 General Description
USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
The SMSC USB251x hub family is a group of low-power, OEM configurable, MTT (multi
transaction translator)
SMSC USB251x hub family is fully compliant with the USB 2.0 specification. Each of the
The
1
hub controller IC’s with downstream ports for embedded USB solutions.
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:
MultiTRAK
speed data throughput regardless of the number of active downstream connections. MultiTRAK
TM
Technology which utilizes a dedicated TT per port to maintain consistent full-
TM
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 I
2
C 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.
Revision 1.0 (3-11-09) 8 SMSC USB251x
DATASHEET
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 9 Revision 1.0 (3-11-09)
DATASHEET
Chapter 3 Acronyms
USB 2.0 Hi-Speed Hub Controller
Datasheet
I2C®: Inter-Integrated Circuit
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
2
1.I
C is a registered trademark of Philips Corporation.
Revision 1.0 (3-11-09) 10 SMSC USB251x
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 4 Block Diagram
To Upstream
V
BUS
Upstream
USB Data
3.3 V
24 MHz
Crystal
To EEPROM or
SMBus Master
SCK
SDA
3.3 V
Bus-
Power
Detect/
Pulse
V
bus
Regulator
CRFILT
Upstream
Regulator
PHY
Serial
Repeater
Interface
Engine
TT
#1
Routing & Port Re-Ordering Logic
Port #1
PHY#1
OC Sense
Switch Driver/
LED Drivers
...
PLL
...
PHY#x
Serial
Interface
Controller
TT
Controller
#x
Port #x
OC Sense
Switch Driver/
LED Drivers
Port
USB Data
Downstream
OC
Sense
Switch/
LED
Drivers
Port
Power
USB Data
Downstream
OC
Sense
Switch/
LED
Drivers
Port
Power
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 11 Revision 1.0 (3-11-09)
DATASHEET
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.
5.1 Pin Configurations and Lists (Organized by Package Type)
SUSP_IND / LOCAL_PWR / NON_REM[0]
VDD33
USBDM_UP
USBDP_UP
XTALOUT
XTALIN / CLKIN
PLLFILT
RBIAS
VDD33
RESET_N24HS_IND / CFG_SEL[1]23SCL / SMBCLK / CFG_SEL[0]
VBUS_DET
26
27
28
29
30
31
USB2512/12A/12B
32
USB2512i/12Ai/12Bi
33
(Top View QFN-36)
34
35
(must be connected to VSS)
36
1
2
USBDP_DN[1]
USBDM_DN[1]
VDD33
25
SMSC
Ground Pad
3
4
5NC6NC7NC8NC9
VDD33
USBDP_DN[2]
USBDM_DN[2]
SDA / SMBDATA / NON_REM[1]21NC20NC
22
NC
19
18
17
16
15
14
13
12
11
10
Indicates pins on the bottom of the device.
NC
OCS_N[2]
PRTPWR[2] / BC_EN[2]*
VDD33
CRFILT
OCS_N[1]
PRTPWR[1] / BC_EN[1]*
TEST
VDD33
Figure 5.1 2-Port 36-Pin QFN
Note: *Battery charging enable (BC_EN) is only available in the USB251xB/Bi.
Revision 1.0 (3-11-09) 12 SMSC USB251x
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
SUSP_IND / LOCAL_PWR / NON_REM[0]
VDD33
USBDM_UP
USBDP_UP
XTALOUT
XTALIN / CLKIN
PLLFILT
RBIAS
VDD33
RESET_N24HS_IND / CFG_SEL[1]23SCL / SMBCLK / CFG_SEL[0]
VBUS_DET
26
27
25
28
29
30
31
32
33
(Top View QFN-36)
34
35
(must be connected to VSS)
SMSC
USB2513/13i
USB2513B/13Bi
Ground Pad
36
1
2
3
4
VDD33
SDA / SMBDATA / NON_REM[1]21NC20NC
22
5
6
VDD33
7NC8NC9
OCS_N[3]
19
18
17
16
15
14
13
12
11
10
PRTPW R[3] / BC_EN[3]*
OCS_N[2]
PRTPW R[2] / BC_EN[2]*
VDD33
CRFILT
OCS_N[1]
PRTPW R[1] / BC_EN[1]*
TEST
VDD33
USBDP_DN[1] / PRT_DIS_P[1]
USBDM_DN[1] / PRT_DIS_M[1]
USBDM_DN[2] / PRT_DIS_M[2]
USBDP_DN[2] / PRT_DIS_P[2]
USBDM_DN[3] / PRT_DIS_M[3]
USBDP_DN[3] / PRT_DIS_P[3]
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 Revision 1.0 (3-11-09)
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
SUSP_IND / LOCAL_PWR / NON_REM[0]
VDD33
USBDM_UP
USBDP_UP
XTALOUT
XTALIN / CLKIN
PLLFILT
RBIAS
VDD33
RESET_N24HS_IND / CFG_SEL[1]23SCL / SMBCLK / CFG_SEL[0]
VBUS_DET
26
25
27
28
29
30
31
32
33
(Top View QFN-36)
34
35
(must be connected to VSS)
SMSC
USB2514/14i
USB2514B/14Bi
Ground Pad
36
1
2
3
4
VDD33
5
VDD33
SDA / SMBDATA / NON_REM[1]21OCS_N[4]20PRTPWR[4] / BC_EN[4]*
22
6
7
OCS_N[3]
19
18
17
16
15
14
13
12
11
10
8
9
PRTPWR[3] / BC_EN[3]*
OCS_N[2]
PRTPWR[2] / BC_EN[2]*
VDD33
CRFILT
OCS_N[1]
PRTPWR[1] / BC_EN[1]*
TEST
VDD33
USBDP_DN[1] / PRT_DIS_P[1]
USBDM_DN[1] / PRT_DIS_M[1]
USBDM_DN[2] / PRT_DIS_M[2]
USBDP_DN[2] / PRT_DIS_P[2]
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]
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) 14 SMSC USB251x
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
LED_A_N[1] / PRTSWP[1]
PRTPWR_POL
SUSP_IND / LOCAL_PWR / NON_REM[0]
SEL48
VDD33
USBDM_UP
USBDP_UP
XTALOUT
XTALIN / CLKIN
PLLFILT
RBIAS
VDD33
37
38
39
40
41
42
43
44
45
46
47
48
LED_B_N[1] / BOOST[0]34VBUS_DET33RESET_N
35
36
HS_IND / CFG_SEL[1]31SCL / SMBCLK / CFG_SEL[0]30VDD3329SDA / SMBDATA / NON_REM[1]28NC
CFG_SEL[2]
32
SMSC
USB2513
(Top View QFN-48)
Ground Pad
(must be connected to VSS)
1
2
3
4
5
VDD33
6
7NC8NC9NC10NC11
OCS_N[3]25LED_A_N[2] / PRTSWP[2]
27NC26
VDD33
12
24
23
22
21
20
19
18
17
16
15
14
13
LED_B_N[2] / BOOST[1]
LED_A_N[3] / PRTSWP[3]
LED_B_N[3] / GANG_EN
PRTPWR[3]
OCS_N[2]
PRTPWR[2]
VDD33
CRFILT
OCS_N[1]
PRTPWR[1]
TEST
NC
USBDP_DN[1] / PRT_DIS_P[1]
USBDM_DN[1] / PRT_DIS_M[1]
USBDP_DN[2] / PRT_DIS_P[2]
USBDM_DN[2] / PRT_DIS_M[2]
USBDP_DN[3] / PRT_DIS_P[3]
USBDM_DN[3] / PRT_DIS_M[3]
Indicates pins on the bottom of the device.
Figure 5.4 3-Port 48-Pin QFN
SMSC USB251x 15 Revision 1.0 (3-11-09)
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
LED_A_N[1] / PRTSWP[1]
PRTPWR_POL
SUSP_IND / LOCAL_PWR / NON_REM[0]
SEL48
VDD33
USBDM_UP
USBDP_UP
XTALOUT
XTALIN / CLKIN
PLLFILT
RBIAS
VDD33
37
38
39
40
41
42
43
44
45
46
47
48
LED_B_N[1] / BOOST[0]34VBUS_DET33RESET_N
35
36
HS_IND / CFG_SEL[1]31SCL / SMBCLK / CFG_SEL[0]30VDD3329SDA / SMBDATA / NON_REM[1]28OCS_N[4]
CFG_SEL[2]
32
SMSC
USB2514
(Top View QFN-48)
Ground Pad
(must be connected to VSS)
1
2
3
4
5
VDD33
PRTPWR[4]26OCS_N[3]25LED_A_N[2] / PRTSWP[2]
27
24
23
22
21
20
19
18
17
16
15
14
13
6
7
8
9
10NC11
12
VDD33
LED_B_N[4]
LED_B_N[2] / BOOST[1]
LED_A_N[3] / PRTSWP[3]
LED_B_N[3] / GANG_EN
PRTPWR[3]
OCS_N[2]
PRTPWR[2]
VDD33
CRFILT
OCS_N[1]
PRTPWR[1]
TEST
LED_A_N[4] / PRTSWP[4]
USBDP_DN[1] / PRT_DIS_P[1]
USBDM_DN[1] / PRT_DIS_M[1]
USBDP_DN[2] / PRT_DIS_P[2]
USBDM_DN[2] / PRT_DIS_M[2]
USBDP_DN[3] / PRT_DIS_P[3]
USBDM_DN[3] / PRT_DIS_M[3]
USBDP_DN[4] / PRT_DIS_P[4]
USBDM_DN[4] / PRT_DIS_M[4]
Indicates pins on the bottom of the device.
Figure 5.5 4-Port 48-Pin QFN
Revision 1.0 (3-11-09) 16 SMSC USB251x
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
LED_A_N[2] / PRTSWP[2]
LED_B_N[1] / BOOST[0]
LED_A_N[1] / PRTSWP[1]
VDD33
USBDM_DN[6] / PRT_DIS_M[6]
USBDP_DN[6] / PRT_DIS_P[6]
USBDM_DN[7] / PRT_DIS_M[7]
USBDP_DN[7] / PRT_DIS_P[7]
VDD33
USBDM_UP
USBDP_UP
XTALOUT
XTALIN / CLKIN
PLLFILT
RBIAS
VDD33
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
VDD3344SUSP_IND / LOCAL_PWR / NON_REM[0]43VBUS_DET42HS_IND / CFG_SEL[1]41SCL / SMBCLK / CFG_SEL[0]40SDA / SMBDATA / NON_REM[1]39PRTPWR[6]38OCS_N[6]
LED_B_N[2] / BOOST[1]
LED_A_N[3] / PRTSWP[3]
46
47
48
RESET_N
45
USB2517/17i
(Top View QFN-64)
(must be connected to VSS)
1
2
3
4
5
6
SMSC
Ground Pad
7
8
9
10
11
OCS_N[7]36PRTPWR[7]35OCS_N[5]
37
12
13
14
LED_B_N[3] / GANG_EN
34
15
LED_A_N[4] / PRTSWP[4]
33
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
LED_B_N[4]
LED_A_N[5] / PRTSWP[5]
PRTPWR[5]
PRTPWR[1]
OCS_N[1]
OCS_N[2]
PRTPWR[2]
CRFILT
VDD33
PRTPWR[3]
OCS_N[3]
OCS_N[4]
PRTPWR[4]
TEST
LED_B_N[5]
LED_A_N[6] / PRTSWP[6]
VDD33
USBDP_DN[1] / PRT_DIS_P[1]
USBDM_DN[1] / PRT_DIS_M[1]
USBDP_DN[2] / PRT_DIS_P[2]
USBDM_DN[2] / PRT_DIS_M[2]
USBDP_DN[3] / PRT_DIS_P[3]
USBDM_DN[3] / PRT_DIS_M[3]
VDD33
LED_B_N[6]
LED_B_N[7]
CFG_SEL[2]
LED_A_N[7] / PRTSWP[7]
USBDP_DN[4] / PRT_DIS_P[4]
USBDM_DN[4] / PRT_DIS_M[4]
USBDP_DN[5] / PRT_DIS_P[5]
USBDM_DN[5] / PRT_DIS_M[5]
Indicates pins on the bottom of the device.
Figure 5.6 7-Port 64-Pin QFN
SMSC USB251x 17 Revision 1.0 (3-11-09)
DATASHEET
Table 5.1 Pin List in Alphabetical Order
PIN NUMBERS
36 QFN 48QFN 64 QFN
USB 2.0 Hi-Speed Hub Controller
Datasheet
SYMBOL NAME
BC_EN[1] Battery
BC_EN[2] - 16 - 16 - 16 -
Charging Strap
Option
USB2512
USB2512i
USB2512A
USB2512Ai
USB2512B
USB2512Bi
USB2513
USB2513i
USB2513B
USB2513Bi
USB2514
USB2514i
USB2514B
USB2514Bi
USB2513
USB2514
-12-12-12 -
BC_EN[3] - 18 - 18 -
BC_EN[4] - 20 -
BOOST[0] PHY Boost
BOOST[1] - 24 48
Strapping
Option
CFG_SEL[0] Configuration
CFG_SEL[1] 25 32 42
Programming
Selection
-3650
24 31 41
CFG_SEL[2] - 33 13
CLKIN External Clock
33 45 61
Input
CRFILT Core Regulator
14 17 25
Filter Capacitor
GANG_EN Ganged Port
-2234
Power Strap
Option
Ground Pad Exposed Pad
ePad
Tied to Ground
(VSS)
HS_IND Hi-Speed
25 32 42
Upstream Port
Indicator
LED_A_N[1] Port LED
LED_A_N[2] - 25 49
Indicator
-3751
LED_A_N[3] - 23 47
LED_A_N[4] - 13 33
LED_A_N[5] - 31
LED_A_N[6] - 17
LED_A_N[7] - 15
LED_B_N[1] Enhanced
LED_B_N[2] - 24 48
Indicator
Port LED
-3650
LED_B_N[3] - 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 Local Power
28 39 45
Detection
USB2517
USB2517i
Revision 1.0 (3-11-09) 18 SMSC USB251x
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
Table 5.1 Pin List in Alphabetical Order (continued)
PIN NUMBERS
36 QFN 48QFN 64 QFN
SYMBOL NAME
USB2512
USB2512i
USB2512A
USB2512Ai
USB2512B
USB2512Bi
USB2513
USB2513i
USB2513B
USB2513Bi
USB2514
USB2514i
USB2514B
USB2514Bi
USB2513
USB2514
NC No Connect 6 - 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-
NON_REM[1] 22 29 40
Removable
Port Strap
28 39 45
Option
OCS_N[1] Over-Current
OCS_N[2] 17 20 27
Sense
13 16 28
OCS_N[3] - 19 26 22
OCS_N[4] - 21 - 28 21
OCS_N[5] - 35
OCS_N[6] - 38
OCS_N[7] - 37
PLLFILT PLL Regulator
34 46 62
Filter Capacitor
PRT_DIS_M[1] Downstream
PRT_DIS_M[2] - 3
Port Disable
Strap Option
-1
PRT_DIS_M[3] - 6
PRT_DIS_M[4] - 8 - 8
PRT_DIS_M[5] - 11
PRT_DIS_M[6] - 53
PRT_DIS_M[7] - 55
PRT_DIS_P[1] Port Disable - 2
PRT_DIS_P[2] - 4
PRT_DIS_P[3] - 7
PRT_DIS_P[4] - 9 - 9
PRT_DIS_P[5] - 12
PRT_DIS_P[6] - 54
PRT_DIS_P[7] - 56
USB2517
USB2517i
SMSC USB251x 19 Revision 1.0 (3-11-09)
DATASHEET
Table 5.1 Pin List in Alphabetical Order (continued)
PIN NUMBERS
36 QFN 48QFN 64 QFN
USB 2.0 Hi-Speed Hub Controller
Datasheet
SYMBOL NAME
PRTPWR[1] USB Port
PRTPWR[2] 16 19 26
Power Enable
USB2512
USB2512i
USB2512A
USB2512Ai
USB2512B
USB2512Bi
USB2513
USB2513i
USB2513B
USB2513Bi
USB2514
USB2514i
USB2514B
USB2514Bi
USB2513
USB2514
12 15 29
PRTPWR[3] - 18 21 23
PRTPWR[4] - 20 - 27 20
PRTPWR[5] - 30
PRTPWR[6] - 39
PRTPWR[7] - 36
PRTPWR_POL Port Power
-38-
Polarity
Strapping
PRTSWP[1] Port Swap
PRTSWP[2] - 25 49
Strapping
Option
-3751
PRTSWP[3] - 23 47
PRTSWP[4] - 13 33
PRTSWP[5] - 31
PRTSWP[6] - 17
PRTSWP[7] - 15
RBIAS USB
35 47 63
Transceiver
Bias
RESET_N Reset Input 26 34 43
SCL Serial Clock 24 31 41
SDA Serial Data
22 29 40
Signal
SEL48
Clock Input
SMBCLK System
Select 48 MHz
-40-
24 31 41
Management
Bus Clock
SMBDATA Server
22 29 40
Message Block
Data Signal
SUSP_IND Active/Suspend
28 39 45
Status Indicator
TEST Test Pin 11 14 19
USBDM_UP USB Bus Data 30 42 58
USBDP_UP 31 43 59
USB2517
USB2517i
Revision 1.0 (3-11-09) 20 SMSC USB251x
DATASHEET
USB 2.0 Hi-Speed Hub Controller
Datasheet
Table 5.1 Pin List in Alphabetical Order (continued)
PIN NUMBERS
36 QFN 48QFN 64 QFN
SYMBOL NAME
USBDM_DN[1] Hi-Speed USB
USBDM_DN[2] 3
Data
USB2512
USB2512i
USB2512A
USB2512Ai
USB2512B
USB2512Bi
USB2513
USB2513i
USB2513B
USB2513Bi
USB2514
USB2514i
USB2514B
USB2514Bi
USB2513
USB2514
1
USBDM_DN[3] - 6
USBDM_DN[4] - 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] - 7
USBDP_DN[4] - 9 - 9
USBDP_DN[5] - 12
USBDP_DN[6] - 54
USBDP_DN[7] - 56
VBUS_DET Upstream
27 35 44
VBUS Power
Detection
VDD33 3.3 V Power 5
VDD33 10
VDD33 15 18 24
VDD33 23 30 46
VDD33 29 41 52
VDD33 36 48 57
VDD33 - 64
XTALIN Crystal Input 33 45 61
XTALOUT Crystal Output 32 44 60
USB2517
USB2517i
SMSC USB251x 21 Revision 1.0 (3-11-09)
DATASHEET
USB 2.0 Hi-Speed Hub Controller
5.2 USB251x Pin Descriptions (Grouped by Function)
Table 5.2 USB251x Pin Descriptions
BUFFER
SYMBOL
TYPE DESCRIPTION
UPSTREAM USB 2.0 INTERFACES
Datasheet
USBDM_UP
USBDP_UP
VBUS_DET I/O12 Detect Upstream VBUS Power
USBDP_DN[x:1]/
PRT_DIS_P[x:1]
USBDM_DN[x:1]/
PRT_DIS_M[x:1]
IO-U USB Data
These pins connect to the upstream USB bus data signals (host, port, or
upstream hub).
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
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.
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] /
BC_EN[x]
Revision 1.0 (3-11-09) 22 SMSC USB251x
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.
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
DATASHEET
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