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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 µW
Crystal type Tuning fork (X+5
o
or X+2
o
cut)
Specification Minimum Typical Maximum Unit
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