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
n Enhanced OEM configuration - 30+
programmable options via 12C EEPROM
or SMBUS
previously available devices
n 40% savings in power consumption vs.
prior SMSC devices
n Designed to meet -40º to 85ºC industrial-
temp requirements
n On-chip 8KV HBM ESD protection for
reducing BOM and cost
n Available in 2/3/4-port versions to serve a
wide range of applications
Target Applications
n Mobile PC Docking Stations
n LCD Monitors/TVs
n PC Motherboards
n HDD Enclosures
n Keyboards
n KVM Switches
n Gaming Consoles
n Server Front Panels
n Point-of-Sale (POS) Terminals
n IP Telephony
n Multi-function Printers
n Cable/DSL Modems
n Set-top Boxes
n Automobile/Home Audio Systems
n Industrial
n DVD/CD-ROM/DVR
Features and Benefits
FEATURES
BENEFITS
MultiTRAK Technology
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
PortMap
PortSwap
TrueSpeed
PHYBoost
Footprint compatibility
On-chip Power-on reset (POR)
Integrated 3.3V to 1.8V regulator
Extended operating temperature
Only a single 3.3V supply required
Available industrial-temp grade SKUs to support systems requiring extended operating temperature of -40° to 85°C
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