[SMSC]

General Description
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 hispeed hub) downstream devices on all of the enabled downstream ports.

FEATUREs
■ USB251xB/xBi products are fully footprint compatible with USB251x/xi/xA/xAi products as direct drop-in replacements
    — Cost savings include using the same PCB components and application of USB-IF Compliance by Similarity
■ Full power management with individual or ganged power control of each downstream port
■ Fully integrated USB termination and pull-up/pulldown resistors
■ Supports a single external 3.3 V supply source; internal regulators provide 1.2 V or 1.8 V internal core voltage
■ Onboard 24 MHz crystal driver, ceramic resonator, or external 24/48 MHz clock input
■ Customizable vendor ID, product ID, and device ID
■ 4 kilovolts of HBM JESD22-A114F ESD protection (powered and unpowered)
■ Supports self- or bus-powered operation
■ USB251xB and USB251xBi products support the USB Battery Charging specification Rev. 1.1 for Charging Downstream Ports (CDP)
■ 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
■ USB251xB products support the extended commercial temperature range of 0ºC to +85ºC

APPLICATIONs
■ 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