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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