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www.pericom.com

P-0.1

02/29/12

PI6C49015

Embedded Clock Generator

C1

18pF

Crystal�(C

C2

18pF

XTAL_IN

XTAL_OUT

Application Notes

Crystal circuit connection

The following diagram shows PI6C49015 crystal circuit connection with a parallel crystal. For the CL=18pF

crystal, it is suggested to use C1= 18pF, C2= 18pF. C1 and C2 can be adjusted to fine tune to the target ppm of

crystal oscillator according to different board layouts.

Crystal Oscillator Circuit

3.3V ±10%

15pF

GND

3.3V ±10%

10Ω

LVCMOS Test Circuit

Recommended Crystal Specification

Pericom recommends:

a) GC2500003 XTAL 49S/SMD(4.0 mm), 25M, CL=18pF, +/-30ppm, http://www.pericom.com/pdf/datasheets/se/GC_GF.pdf

b) FY2500081, SMD 5x3.2(4P), 25M, CL=18pF, +/-30ppm, http://www.pericom.com/pdf/datasheets/se/FY_F9.pdf

c) FL2500047, SMD 3.2x2.5(4P), 25M, CL=18pF, +/-20ppm, http://www.pericom.com/pdf/datasheets/se/FL.pdf

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