NR8576AA Datasheet, PDF (7/10 Pages) Nippon Precision Circuits Inc – Real-time Clock Modules

FOUT
FOUT
NR8576 Series
tf2
10%
tH
90%
tr2
t
Disable/Enable
FOE
tZH
50%
tHZ
50%
50%
Duty=
tH
t
X
100(%)
FOUT
FOE
10%
tZL
50%
90%
tLZ
50%
FOUT
90%
10%
Note that FOE and FSEL do not have chatter elimination circuits. Consequently, switching either FOE or
FSEL during 32 kHz mode operation may generate chatter noise on the FOUT output. Also, note that the 1 Hz
and 32 kHz oscillators are not synchronized to each other, so switching intervals shortens the duty cycle.
Accordingly, a wait time (≥ chattering time + output frequency period) should be incorporated when switching
intervals.
NIPPON PRECISION CIRCUITS—7