XR22404 Datasheet, PDF (11/14 Pages) Exar Corporation – USB 2.0 4-Port Hub

Applications Information (Continued)
3.3V
XR22404
LED1/SCL
XR22404
LED2
LED_CTL/CHRGEN
Hub active
indicator
Figure 4. Joint Port and Hub Activity Indicators
External Crystal
A 12 MHz ± 50 PPM fundamental frequency external crystal must be connected between the XTALIN and XTALOUT pins
of the XR22404 device. The crystal should have a rated load capacitance of 16-20pF. However, note that both the load
capacitors and feedback resistance are internal to the XR22404 device as shown.
Y1
Figure 5. Typical Oscillator Connections
REV1A
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