1 Features

1• 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

– 3 LED Indicator Control Outputs Enable

Visualized Monitoring of 6 Different Hub/Port

Status (HUBCFG, PORTPWR, PORTDIS)

– Output Pin Available to Disable External Pullup

Resistor on DP0 for 15 ms After Reset or After

Change on BUSPWR and Enable Easy

Implementation of Onboard Bus/Self-Power

Dynamic Switching Circuitry

• No Special Driver Requirements; Works

Seamlessly With Any Operating System With USB

Stack Support

• Available in 48-Pin LQFP Package

• JEDEC Descriptor S−PQFP−G for Low-Profile

Quad Flatpack (LQFP).

2 Applications

• Computer Systems

• Docking Stations

3 Description

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.