HA16117FPA RENESAS [Renesas Technology Corp], HA16117FPA Datasheet - Page 13

• Manufacturer Part Number: HA16117FPA
• Description: CMOS Watchdog Timer
• Manufacturer: RENESAS [Renesas Technology Corp]

HA16117F Series
6. When P-RUN frequency fluctuates (1)
Rev.3.00 Jun 15, 2005 page 13 of 30
P-RUN
RES
WD
C
C
Q
Q
C
A
B
R
F
3.6 V
0.9 V
3.2 V
1.6 V
If there is a double-pulse in P-RUN, the WD filter duty will be decreased and RES will be
output, as shown in the figure below, for example. In this case, the condition for non-output of
the RES signal is a value of 3 or less for the ratio of P-RUN pulse interval minimum value to
maximum value (when f
ratio is 3.
5 V
0 V
5 V
0 V
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
2 ms
28 ms
P-RUN
20 kHz). This is because the C
20 ms
R
pin charge/discharge current