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
nUp to 60% space savings compared to previously available devices
n40% savings in power consumption vs. prior SMSC devices
nOn-chip ±8KV HBM ESD protection for reducing BOM and cost
nEnhanced OEM configuration - 30+ programmable options via 12C EEPROM or SMBUS
nDesigned to meet -40º to 85ºC industrial- temp requirements
nAvailable in 2/3/4-port versions to serve a wide range of applications
Target Applications
n Mobile PC Docking Stations | n HDD Enclosures |
n LCD Monitors/TVs | n Keyboards |
n PC Motherboards | n KVM Switches |
n Gaming Consoles | n Server Front Panels |
n Multi-function Printers | n Point-of-Sale (POS) Terminals |
n Cable/DSL Modems | n IP Telephony |
n Set-top Boxes | n Automobile/Home Audio Systems |
n DVD/CD-ROM/DVR | n Industrial |
Features and Benefits
| FEATURES | BENEFITS | |
| MultiTRAK Technology | Dedicated transaction translator (TT) for EVERY downstream port provides best-in-class performance | |
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| PortMap | Flexible port mapping and port disable sequence supports multiple-SKU platform designs | |
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| PortSwap | Programmable USB differential-pair pin locations ease PCB design by aligning USB signal traces directly to connectors | |
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| TrueSpeed | USB host/device connection speed indicator provides visual feedback on USB Hi/Full/Low-Speed connectivity | |
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| PHYBoost | Programmable USB transceiver drive strength for recovering signal integrity due to compromised system environment | |
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| Footprint compatibility | Common pin-out 2/3/4-port hubs in a 36QFN package enables flexible port expansion options without PCB redesign | |
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| On-chip Power-on reset (POR) | Provides proper power-on reset and saves BOM cost | |
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| Integrated 3.3V to 1.8V regulator | Only a single 3.3V supply required | |
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| Extended operating temperature | Available industrial-temp grade SKUs to support systems requiring extended operating temperature of -40° to 85°C | |
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