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General Description

The Microchip USB251xB/xBi hub is a family of lowpower,

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 lowspeed,

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 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