1 Features
• Four port USB 3.2 x1 Gen1 (5Gbps) hub
• USB 2.0 hub features
– Multiple transaction translator (MTT) hub: four
transaction translators
– Two asynchronous endpoint buffers per
transaction translator
• Supports battery charging:
– Supports D+/D– divider charging port (ACP1,
ACP2, and ACP3) when the upstream port is
unconnected or not configured
– Supports automatic mode for transition
between DCP or ACP modes when the
upstream port is unconnected
– Supports galaxy charging
– CDP mode (upstream port connected)
– DCP mode (upstream port unconnected)
– DCP mode complies with Chinese
telecommunications industry standard YD/T
1591-2009
• Supports operation as a USB 3.2 x1 Gen1 or USB
2.0 compound device
• Per port or ganged power switching and
overcurrent notification inputs
• Supports four external downstream ports
• Supports vendor requests to read and write I2C
and EEPROM read at 100k
• I2C controller supports clock stretching
• OTP ROM, Serial EEPROM or I2C/SMBus target
interface for custom configurations:
– VID and PID
– Port customizations
– Manufacturer and product strings (not by OTP
ROM)
– Serial number (not by OTP ROM)
• Application Feature selection using pin selection or
EEPROM or I2C/SMBus target interface
• Provides 128-bit Universally Unique Identifier
(UUID)
• Single clock input, 24MHz crystal or oscillator
• Downstream ports configurable to USB 2.0 only
• 64-pin QFN package (RGC)

2 Applications
• Computer systems
• Docking stations
• Monitors
• Set-top boxes

3 Description
The TUSB8042A is a four-port USB 3.2 x1 Gen1
(5Gbps) hub. The device provides simultaneous
SuperSpeed USB, high-speed, or full-speed
connections on the upstream port. The device
also provides SuperSpeed USB, high-speed, fullspeed,
or low-speed connections on the downstream
port. When the upstream port is connected to an
electrical environment that only supports high-speed,
full-speed, or low-speed connections, SuperSpeed
USB connectivity is disabled on the downstream
ports.
When the upstream port is connected to an electrical
environment that only supports full-speed or lowspeed
connections, SuperSpeed USB and high-speed
connectivity are disabled on the downstream ports.
The TUSB8042A supports per port or ganged power
switching and overcurrent protection, and supports
battery charging applications.
An individually port power controlled hub switches
power on or off to each downstream port as requested
by the USB host. Also when an individually port power
controlled hub senses an overcurrent event, only
power to the affected downstream port is switched off.
A ganged hub switches on power for all the
downstream ports when power is required for any
port. The power to the downstream ports is not
switched off unless all ports are in a state that allows
power to be removed. Also when a ganged hub
senses an overcurrent event, power to all downstream
ports is switched off.