General Description
The SMSC USB251xB/xBi hub is a family of low-power, configurable, MTT (multi transaction translator) hub controller IC products for embedded USB solutions. The x in the part number indicates the number of downstream ports available, while the B indicates battery charging support. The SMSC hub supports low speed, full-speed, and hi-speed (if operating as a hi speed hub) downstream devices on all of the enabled downstream ports.
Features
â USB251xB/xBi products are fully footprint compatible with USB251x/xi/xA/xAi products as direct drop-in replacements
â Cost savings include using the same PCB components and application of USB-IF Compliance by Similarity
â Full power management with individual or ganged power control of each downstream port
â Fully integrated USB termination and pull-up/pull down resistors
â Supports a single external 3.3 V supply source; internal regulators provide 1.2 V internal core voltage
â Onboard 24 MHz crystal driver or external 24 MHz clock input
â Customizable vendor ID, product ID, and device ID
â 4 kilovolts of HBM JESD22-A114F ESD protection (powered and unpowered)
â Supports self- or bus-powered operation
â Supports the USB Battery Charging specification Rev. 1.1 for Charging Downstream Ports (CDP)
â The USB251xB/xBi offers the following package:
â 36-pin QFN (6x6 mm) lead-free RoHS compliant package
â USB251xBi products support the industrial temperature range of -40ºC to +85ºC
â USB251xB products support the extended commercial temperature range of 0ºC to +85ºC
Applications
â LCD monitors and TVs
â Multi-function USB peripherals
â PC motherboards
â Set-top boxes, DVD players, DVR/PVR
â Printers and scanners
â PC media drive bay
â Portable hub boxes
â Mobile PC docking
â Embedded systems
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