Intel SA-1100 User Manual

C-4

 SA-1100 

 Developer’s Manual

32.768–kHz Oscillator Specifications

The following values are not required for the crystal oscillator to function, but they directly affect 
the performance of the oscillator in the system because they determine the accuracy of the crystal 
itself.  The values given represent those seen on typical crystals used for timekeeping, and are 
provided for information only. 

Load capacitance (CL)

10

12.5

25

pF

Drive level

—

—

1

µ

W

Crystal type

Tuning fork (X+5

o

 or X+2

o

 cut)

Frequency tolerance

+/-5

+/-20

+/-30

ppm

Parabolic curvature

—

-0.042

-0.05

ppm/

 o

C

Turnover temperature

20

25

30

o

C

Temperature range

0

—

60

o

C

Aging

—

+/-3

+/-5

ppm/year