(1) JEDEC descriptor S-PQFP-G for low-profile quad flatpack
(LQFP).
1 Features
1• Fully Compliant With the USB Specification as a
Full-Speed Hub: TID #30220231
• 32-Pin LQFP (1) Package With a 0.8-mm Terminal
Pitch or QFN Package With a 0.5-mm Pin Pitch
• 3.3-V Low-Power ASIC Logic
• Integrated USB Transceivers
• State Machine Implementation Requires No
Firmware Programming
• One Upstream Port and Four Downstream Ports
• All Downstream Ports Support Full-Speed and
Low-Speed Operations
• Two Power Source Modes
– Self-Powered Mode
– Bus-Powered Mode
• Power Switching and Overcurrent Reporting Is
Provided Ganged or Per Port
• Supports Suspend and Resume Operations
• Supports Programmable 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
• Package Pinout Allows 2-Layer PCB
• Low EMI Emission Achieved by a 6-MHz Crystal
Input
• Migrated From Proven TUSB2040 Hub
• Lower Cost Than the TUSB2040 Hub
• Enhanced System ESD Performance
• No Special Driver Requirements; Works
Seamlessly With Any Operating System With USB
Stack Support
• Supports 6-MHz Operation Through a Crystal
Input or a 48-MHz Input Clock

2 Applications
• Computer Systems
• Docking Stations

3 Description
The TUSB2046x is a 3.3-V CMOS hub device that
provides one upstream port and four downstream
ports in compliance with the Universal Serial Bus
(USB) specification as a full-speed hub. Because this
device is implemented with a digital state machine
instead of a microcontroller, no firmware
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 pin selects either the
bus-powered or the self-powered mode.
Configuring the GANGED input determines the power
switching and overcurrent detection modes for the
downstream ports. If GANGED is high, all PWRON
outputs switch together and if any OVRCUR is
activated, all ports transition to the power-off state. If
GANGED is low, the PWRON outputs and OVRCUR
inputs operate on a per-port basis.