General Description
The Microchip 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 Microchip 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
• 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 internal core voltage
• Onboard 24 MHz crystal driver or external 24 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
• Supports the USB Battery Charging specification Rev. 1.1 for Charging Downstream Ports (CDP)
• The USB251xB/xBi offers the following packages: - 36-pin SQFN (6x6 mm) (Preferred) - 36-pin QFN (6x6 mm) (Legacy)
• 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