HA16117F Datasheet, PDF (14/31 Pages) Hitachi Semiconductor – CMOS Watchdog Timer

HA16117F Series
7. When P-RUN frequency fluctuates (2)
If there is a double-pulse in P-RUN, RES will not be output as long as the ratio of P-RUN
pulse interval minimum value to maximum value is 3 or less. The timing chart for a P-RUN
minimum interval of 8 ms and maximum interval of 22 ms is shown below.
H
P-RUN
L
H
Q
L
H
Q
L
H
A
L
5V
3.6 V
C_F
0.9 V
0V
H
WD
L
5V
3.2 V
C_R
1.6 V
0V
H
B
L
H
C
L
H
RES
L
8 ms
22 ms
14