TUSB2077APTR Circuit Board Chips 7 Port Hub For Universal Serial Bus

►Universal Serial Bus (USB) Version 1.1 Compliant

►Integrated USB Transceivers

►3.3-V Low Power ASIC Logic

►Two Power Source Modes

– Self-powered Mode Supporting Seven Downstream Ports

– Bus-powered Mode Supporting Four Downstream Ports

► All Downstream Ports Support Full-Speed and Low-Speed Operations

►Power Switching and Overcurrent Reporting is Provided Per Port or Ganged

►Supports Suspend and Resume Operations

►Suspend Status Terminal Avaliable for External Logic Power Down

►Supports Custom Vendor ID and Product ID With External Serial EEPROM

►3-State EEPROM Interface to Allow EEPROM Sharing

description

The TUSB2077A hub is a 3.3-V CMOS device that provides up to seven down stream ports in compliance with the USB version 1.1 specification. Because this device is implemented with a digital state machine instead of a microcontroller, no software programming is required. Fully compliant USB transceivers are integrated into the ASIC for all upstream and downstream ports. The downstream ports support both full-speed and low-speed devices by automatically setting the slew rate according to the speed of the device attached to the ports. The configuration of the BUSPWR terminal selects either the bus-powered or the self-powered mode. The introduction of the DP0 pull-up resistor disable pin, DP0PUR, makes it much easier to implement an on-board bus/self-power dynamic-switching circuitry. The three LED indicator control output pins also enable the implementation of visualized status monitoring of the hub and its downstream ports. With these new function pins, the end equipment vendor can considerably reduce the total board cost while adding additional product value.

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