Intel J1850 FH8065301455200 User Manual

Datasheet

89

1.

These are the specifications needed to select a crystal oscillator for the RTC circuit.

2.

Crystal tolerance impacts RTC time. A 10 ppm crystal is recommended for 1.7 s tolerance per day, RTC 

circuit itself contributes addition 10 ppm for a total of 20 ppm in this example.

1.

These are the specifications needed to select a crystal oscillator for the Integrated Clock circuit. Crystal 

must be AT cut, fundamental, parallel resonance.

F

ICLK

Frequency

-

25

-

MHz

1

T

PPM

Crystal frequency tolerance & 

stability

-

-

±30

ppm

1

P

DRIVE

Crystal drive load

-

-

100

uW

1

R

ESR

ESR

-

-

100

Ohm

1

C

LOAD

Crystal load capacitance

18

pF

C

SHUNT

Crystal shunt capacitance

-

-

6

pF

1

C

IN/OUT

Capacitance of oscillator pins 

pF

1