USB 2.0 4-Port Hub
XR22404
1/14
REV1A
FEATURES
USB 2.0 compliant interface
Compatible with Battery Charging
specification revision 1.1/1.2
LED indicators for port, hub or charging
activity
Ganged port power enable
Global overcurrent sensing
Single 5V or 3.3V power supply
Single 12MHz Crystal
APPLICATIONS
USB port expansion
Docking stations
POS terminals
Factory automation and process controls
Industrial applications
Description
The XR22404 is a USB 2.0 4-port hub with a Single Transaction
Translator (STT). It may be configured for downstream device charging
and is compatible with Battery Charging specification revision 1.1/1.2.
The upstream USB interface has an integrated USB 2.0 PHY and
device controller that is compliant with both hi-speed (480Mbps) and
full-speed (12Mbps) and downstream PHY supporting hi-speed, full-
speed and low-speed (1.5Mbps) on each of the 4 downstream ports.
The XR22404 provides ganged power control and global overcurrent
sensing for the downstream ports.
The XR22404 may be operated from either 5V or 3.3V. If powered
from 5V internal regulators provide 3.3V and 1.8V used internally by
the device. Port activity and overall hub activity indicators provide
status outputs for external LEDs. An external I
2
C EEPROM may be
used with the XR22404 to configure USB device descriptors.
Typical Application
Figure 1. Typical Application
XR22404
USB Host
Upstream Phy
Hub Controller
TT
Port Routing
Downstream Phy x4
Device #1 Device #2 Device #3 Device #4
