XR22417
XR22417 is USB 2.0 7-Port Hub manufactured by Exar.
Description
The XR22417 is a USB 2.0 7-port hub using Multiple Transaction Translators (MTT) for highest possible bandwidth capability. The upstream USB interface has an integrated USB 2.0 PHY and device controller that is pliant with both hi-speed (480 Mbps) and full-speed (12 Mbps). The downstream PHY supports hi-speed, full-speed and low-speed (1.5 Mbps) on each of the 7 downstream ports. Individual port activity and overall hub activity indicators provide status outputs to control external LEDs for each port. An external EEPROM may be used with the XR22417 to change selected USB descriptors including the USB vendor and product IDs, the number of downstream ports and device serial number. Overcurrent protection and power control for each downstream port is available in the LQFP-64 package. The XR22417 operates from a single 5V power input. Internal regulators provide a 3.3V output which may be connected to VCC33 power input pins. In turn a second internal regulator provides a 1.8V output from the 3.3V input. This 1.8V output may be connected to VCC18 power input pins.
Typical Application
FEATURES
- - USB 2.0 pliant interface
- - Multiple transaction translators (MTT)
- - Regulated +3.3V output power
- - Individual port and hub activity
LED indicators
- - Individual power enables (LQFP-64)
- - Individual overcurrent sensing (LQFP-64)
- - Single 5V power input
- - Single 12 MHz Crystal
APPLICATIONS
- - USB port expansion
- - Docking stations
- - POS terminals
- - Test instrumentation
- - Factory automation and process controls
- - Industrial applications
USB Host
Upstream Phy Hub Controller
Port Routing
Downstream Phy x7
Device #1 Device #2
...
Device #7
Figure 1. Typical Application
REV1A
1/17
Absolute Maximum Ratings
Stresses beyond the limits listed below may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
VCC5 supply voltage...
