MB3773
EXAMPLE 10 : Circuit for Monitoring Multiple Microcomputers
VCC (=5V)
FF1
D1
FF2
D2
FF3
D3
S
S
S
Q1
Q2
Q3
CK1 Q1
R
CK2 Q2
R
CK3 Q3
R
R2
R1
RESET
RESET
RESET
RESET
CK
RESET
CK
RESET
CK
GND
GND
GND
1
2
8
7
6
5
3
4
CT
MB3773
Figure 1
•
connects from FF1 and FF2 outputs Q1 and Q2 to the NOR input.
Depending on timing, these connections may not be necessary.
Example:R1 = R2 = 2.2kΩ
CT = 0.1µF
CK1
Q1
CK2
Q2
CK3
Q3
NOR
Output
Figure 2
19