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.