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AU6254
AU6254 - USB2.0 Hub Controller  

AU6254 is a fully compliant with the USB 2.0 hub specification and is designed to work with USB
host as a high-speed hub. Its built-in TT (Transaction Translator) allows system to benefit
combinational performance under the unbalanced traffic condition.

AU6254 supports four USB downstream ports and one upstream port. Each downstream port could
be a device of high-speed, full-speed or low-speed traffic, while the upstream port supports both
high-speed and full-speed traffic. For each downstream port it has individual power switch control
built-in as over-current sensing control.

In addition to the application as a stand-alone hub, AU6254 is also very suitable for using in
notebook and motherboard design to provide additional USB port. All these product advantages
should be attributed to its compliance to standards, performance and low power consumption.

  
Feature :
Fully compliant with USB Hub Specification version 2.0 and is also backward compatible with USB
Hub specification 1.1.  
Single chip USB 2.0 hub controller.  
Supports four bus-powered/self-powered downstream ports.  
Supports automatic switching between bus- and self-powered modes.  
Cost effective design using one transaction translator for all downstream ports.  
Two-color LED controls available for each downstream port to indicate the status of each device
port.  
Extra low power consumption.  
On chip internal pull-up and meets USB bus power regain emend pull down resistors for all data
line.  
Built-in USB 2.0 transceiver.  
Supports individual and gang modes of power management.  
Built-in power switch control for over current sensing control.  
Built-in 1.8V regulator for core logic.  
Embedded in PLL (Phase Lock Loop) circuit for 12MHz operation precision  
Supports external EEPROM interface for customized PID and VID  
Available in two different form factors: 48-pin LQFP package and 64-pin LQFP package.