S5PV210_HARDWARE DESING GUIDE REV 1.0
84
Aging:
±
3.0ppm/year max.
Note) External capacitance calculation
External capacitor C1,2 can be calculated by following equation.
CL
≒
{ (C1 + C
IC_IN
) (C2 + C
IC_OUT
) / (C
IC_IN
+ C1 + C2 + C
IC_OUT
) } + pcb strays (
assumed to
1~3pF)
i) Load capacitance (CL) is specified when ordering crystal.
ii) Pin capacitance
C
IC_IN
1.8 pF
Pin capacitance for
X-tal main,usb,hdmi
C
IC_OUT
2.5 pF
C
IC_IN
1.2 pF
Pin capacitance for
X-tal rtc
C
IC_OUT
2.5 pF
EX) If Crystal has CL=14pF , then C1,C2 are around 22pF.