XR22404 Datasheet, PDF (1/14 Pages) Exar Corporation – USB 2.0 4-Port Hub

XR22404
USB 2.0 4-Port Hub
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 I²C EEPROM may be
used with the XR22404 to configure USB device descriptors.
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
Typical Application
USB Host
XR22404
Upstream Phy
Hub Controller
TT
Port Routing
Downstream Phy x4
Device #1 Device #2 Device #3 Device #4
Figure 1. Typical Application
REV1A
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