Samsung S5PV210 Hardware Design Manual page 84

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