Hot-selling and scarce TUSB2077APTR 7-Port Hub for the Universal Serial Bus With Optional Serial EEPROM Interface QFP

Product Descriptions

The TUSB2077A hub is a 3.3-V CMOS device that provides up to seven downstream ports in compliance with the USB 2.0 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 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 self-powered mode.

The introduction of the DP0 pull-up resistor disable terminal, DP0PUR, makes it much easier to implement an onboard 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.

Product Features

• Fully Compliant With the USB Specification as a Full-Speed Hub: TID #20240226

• 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 Ganged or Per Port

• Supports Suspend and Resume Operations

• Suspend Status Pin Available for External Logic Power Down

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

• 3-State EEPROM Interface Allows EEPROM Sharing

• Push-Pull Outputs for PWRON Eliminate the Need for External Pullup Resistors

• Noise Filtering on OVRCUR Provides Immunity to Voltage Spikes

• Supports 6-MHz Operation Through a Crystal Input or a 48-MHz Input Clock

• New Functional Pins Introduced to Reduce the Board Material Cost

Product Applications

• Computer Systems

• Docking Stations

Product Specification

Product Photos

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