TUSB2077A_17 Datasheet, PDF (1/26 Pages) Texas Instruments – 7-Port Hub for the Universal Serial Bus With Optional Serial EEPROM Interface

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TUSB2077A
SLLS414F – MARCH 2000 – REVISED AUGUST 2015
TUSB2077A 7-Port Hub for the Universal Serial Bus With Optional
Serial EEPROM Interface
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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TUSB2077A
LQFP (48)
7.00 mm × 7.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
USB-Tiered Configuration Example
Personal
Computer
Monitor with
TUSB2077A
7-Port Hub
Printer with
TUSB2077A
7-Port Hub
Modem
Keyboard with
TUSB2077A
7-Port Hub
Digital Scanner
Scanner
Right Speaker
Mouse
Left Speaker
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.