SMSC USB2514i User Manual

MultiTRAK Technology

PortMap

PortSwap

TrueSpeed

PHYBoost

Footprint compatibility

On-chip Power-on reset (POR)

Integrated 3.3V to 1.8V regulator

Extended operating temperature

Dedicated transaction translator (TT) for EVERY downstream port provides best-in-class performance

Flexible port mapping and port disable sequence supports multiple-SKU platform designs

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

USB host/device connection speed indicator provides visual feedback on USB Hi/Full/Low-Speed connectivity

Programmable USB transceiver drive strength for recovering signal integrity due to compromised system environment

Common pin-out 2/3/4-port hubs in a 36QFN package enables flexible port expansion options without PCB redesign

Provides proper power-on reset and saves BOM cost

Only a single 3.3V supply required

Available industrial-temp grade SKUs to support systems requiring extended operating temperature of -40° to 85°C

FEATUR ES BENE F ITS

USB251x Family

High-Performance, Low-Power, Small Footprint USB 2.0 Hub Controller Family for
PC, Embedded and Consumer Applications

SMSC’s USB251x is a family of versatile, cost-effective and power-efficient USB 2.0 hub

controllers. Leveraging SMSC’s innovative MultiTRAK™ technology that delivers industry-

leading data throughput in mixed-speed USB environments, the USB251x family is designed

for applications that demand low power and a small footprint without compromising on

performance. Well-suited for consumer and mobile applications, all members of the USB251x

family are available in space-saving packages. The common 36-pin package shared among

all USB251x controllers measures only 6x6mm and provides an ultra small footprint for

space-constrained designs while allowing scalable port expansion from two to four ports.

Over 30 programmable features, including SMSC’s unique PortMap, PortSwap, TrueSpeed

and PHYBoost are designed to aid system designers in simplifying PCB layout and optimizing

bill-of-material cost.

Highlights

n Up to 60% space savings compared to

previously available devices

n 40% savings in power consumption vs.

prior SMSC devices

n On-chip ±8KV HBM ESD protection for

reducing BOM and cost

n Enhanced OEM configuration - 30+

programmable options via 12C EEPROM
or SMBUS

n Designed to meet -40º to 85ºC industrial-

temp requirements

n Available in 2/3/4-port versions to serve a

wide range of applications

Target Applications

Mobile PC Docking Stations

n

LCD Monitors/TVs

n

PC Motherboards

n

Gaming Consoles

n

Multi-function Printers

n

Cable/DSL Modems

n

Set-top Boxes

n

DVD/CD-ROM/DVR

n

Features and Benefits

HDD Enclosures

n

Keyboards

n

KVM Switches

n

Server Front Panels

n

Point-of-Sale (POS) Terminals

n

IP Telephony

n

Automobile/Home Audio Systems

n

Industrial

n

SMSC MultiTRAK™ Technology

700

600

500

400

300

200

100

0

Throughput (KB per sec)

Number of downstream Full-Speed connections

1 2 3 4

Single-TT Hub Multi-TT Hub

P1: Connected
P2: Connected
P3: Disabled
P4: Disabled

Disabled
Connected
Disabled
Connected

P1
P2
P3
P4

P0

Logical

Connection

USB PORT VIRTUALIZATION

Physical

Connection

High-Speed
Full-Speed
Low-Speed

LED

D+
D-

Chip
D-

D+

C31 J2

+

D­ D+

USB

Connector

C28

Chip
D+

D-

D­D+

C25 C26

J2

USB

Connector

Before Boost After Boost

# Downstream Ports

MultiTRAK Technology

PortMap

PortSwap

TrueSpeed

PHYBoost

I2C/SMBus

-40° to 85°C

36QFN (6x6x0.9 mm)

48QFN (7x7x0.85mm)

RoHS compliant

USB2512 USB2512 i USB 2513 U SB2513i USB2514 USB2514i

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

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.

PortSwap adds per-port programmability to USB differential-pair pin loca­tions. 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.

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), Full­Speed (12 Mbps) and Low-Speed (1.5 Mbps).

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?

SMSC L iterature # CP-HUB-037- 12/07-1

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

SMSC 80 Arkay Drive, Hauppauge, NY 11788

Fo r Ro HS co mpli ance and env ironm enta l in form ation , pl ease vis it w ww. sms c.co m/roh s

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 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 and the SMSC logo are regi stered tradema rks
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)