SMSC USB2513B User Manual

SMSC USB251x Hub Family

Revision 1.0 (3-11-09) 

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 hi-

speed hub) downstream devices on all of the enabled

downstream ports. 

For a summary of the products documented in this

datasheet, please refer to the 

.

„

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

2

C

®

 EEPROM, or 

SMBus slave port

„

— High-performance multiple transaction translator which 

provides one transaction translator per port

„

— Flexible port mapping and disable sequencing

„

— Programmable USB differential-pair pin locations ease 

PCB design by aligning USB signal lines directly to 
connectors

„

— 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/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 

„

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

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

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