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PI6C557-05Q

PCIe® 2.0 Clock Generator with 4 HCSL Outputs for Automotive Applications

www.pericom.com

PI6C557-05Q

Rev B

05/05/14

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Recomended Crystal Specification

Pericom recommends:

a) FL2500184Q, SMD 3.2x2.5(4P), 25M, CL=20pF, Frequency Tolerance ±15ppm, Stability ±20ppm

(http://www.pericom.com/pdf/datasheets/se/FL.pdfb)

C1

27pF

25M Crystal�

(C

C2

27pF

Xin

Xout

Optional

360Ω

Recommended Crystal Circuit

The following diagram shows PI6C557-05Q crystal circuit connection with a parallel crystal. For the C L=20pF

parallel crystal, it is suggested to use C1=27 pF, C2=27 pF in general. C1 and C2 can be adjusted to fine tune to the

target ppm of crystal oscillation according to different board layouts. R1=360 ohm is recommended in layout for

smaller size crystal drive level adjustment.

14-0063