SMSC MultiTRAK™ Technology

MultiTRAK utilizes a dedicated TT per port to maintain consistent Full-Speed data throughput regardless of the number of active downstream connections. MultiTRAK outperforms conventional USB 2.0 hubs with a single TT in USB Full-Speed data transfers by up to 100%*, effectively doubling the amount of data throughput for every downstream port.

*with a minimum of four Full-Speed bulk mass storage devices on a 4-port hub

Throughput (KB per sec)

Single-TT Hub

 

Multi-TT Hub

700

600

500

400

300

200

100

0

2

3

4

1

Number of downstream Full-Speed connections

PortMap provides flexible port mapping and disable sequences. The downstream ports of USB251x hubs can be reordered or disabled in any sequence to support single-platform, multiple-SKU systems in managing component population options. For any port that is disabled, the USB251x automatically reorders the remaining ports to match the USB host controller’s port numbering scheme.

 

Logical

 

 

 

Physical

 

Connection

 

 

 

Connection

 

 

 

 

 

 

 

 

 

P1: Connected

 

P1

 

 

Disabled

 

 

 

P2: Connected

P0

P2

 

 

Connected

 

 

P3: Disabled

P3

 

 

Disabled

 

 

P4: Disabled

 

P4

 

 

Connected

 

 

 

 

 

 

 

 

 

 

 

 

USB PORT VIRTUALIZATION

PortSwap adds per-port programmability to USB differential-pair pin loca- tions. PortSwap allows direct alignment of USB signals (D+/D-) to connectors avoiding uneven trace length or crossing of the USB differential signals on the PCB.

Chip

D+

D-

C26

J2

 

C25

 

USB

Chip

Connector

D-

D-

 

D+

D+

 

+

C31 J2

USB

Connector

D-

D+

C28

TrueSpeed is a USB host/device port status indicator to provide visual feedback on connection speed. Per-port, three-color LED drivers indicate the speed of connected USB host and devices – Hi-Speed (480 Mbps), Full- Speed (12 Mbps) and Low-Speed (1.5 Mbps).

LED High-Speed

Full-Speed

D+ Low-Speed

D-

SMSC Literature #CP-HUB-037-12/07-1

PHYBoost enables programmable four-level USB signal drive strengths in downstream port transceivers. PHYBoost attempts to restore USB signal integrity that has been compromised by system level variables such as poor PCB layout, long cables, etc. The graphics at the right show an example of Hi-Speed USB eye diagrams before (PHYBoost at 0%) and after (PHYBoost at 12%) signal integrity restoration in a compromised system environment.

Which USB251x Family Member Is Right For Your Design?

USB2512
USB2512i
USB2513
USB2513i
USB2514

USB2514i

# Downstream Ports

MultiTRAK Technology

PortMap

PortSwap

TrueSpeed

PHYBoost

I2C/SMBus

-40° to 85°C

36QFN (6x6x0.9 mm)

48QFN (7x7x0.85mm)

RoHS compliant

For more information visit www.smsc.com or call 1.800.443.SEMI

SMSC 80 Arkay Drive, Hauppauge, NY 11788

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Before Boost
After Boost

Copyright ©2007 SMSC or its subsidiaries. All rights reserved. Although the information in this document has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to product descriptions and specifications 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 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. Products may contain design defects or errors known as anomalies which may cause a 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 cus- tomer. 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 and the SMSC logo are registered trademarks and MultiTRAK is a trademark of Standard Microsystems Corporation (“SMSC”). Other names mentioned may be trademarks of their respective holders. All claims made herein speak as of the date of this material. The company does not undertake to update such statements. (6/07)

For RoHS compliance and environmental information, please visit www.smsc.com/rohs