HA16117FA HITACHI [Hitachi Semiconductor], HA16117FA Datasheet - Page 27

• Manufacturer Part Number: HA16117FA
• Description: CMOS Watchdog Timer
• Manufacturer: HITACHI [Hitachi Semiconductor]

P-RUN Input Frequency vs. K
P-RUN High Threshold Frequency vs. C
100 k
100 k
10 M
10 k
10 k
1 M
100
1 M
1 k
10
500 p
0.55
1
MPU system normal
MPU system abnormal
Ta = 25 C
MPU system normal
External capacitance C
0.6
1000 p
Tadj constant
MPU system abnormal
K=
0.7
Ta = 25 C
R
1
R
+ R
K
2
(Tadj
2
0.8
0.01
constant)
F
(F)
F
0.03
Capacitance
Notes: 1.
Notes: 1.
5V
0V
generator
2.
2.
duty 50%
5 V
generator
Pulse
0 V to 5 V duty 50%
Normal detection is assumed when RES is not output.
The figure at left is for a constant P-RUN frequency.
Normal detection is assumed when RES is not output.
The figure at left is for a constant P-RUN frequency.
0.01
Pulse
C
5 V
F
0.1
C
R
Test circuit
Test circuit
V
P-RUN ACC
C
C
V
P-RUN ACC
C
C
CC
CC
F
R
F
R
HA16117F Series
GND
GND
RES
RES
Tadj
Tadj
Oscilloscope
Oscilloscope
K =
R
R
1
R
1
R
+ R
2
510 k
750 k
2
2
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