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