MB3773 Datasheet, PDF (23/31 Pages) Fujitsu Component Limited. – Power Supply Monitor with Watch-Dog Timer

MB3773
EXAMPLE 10: Circuit for Monitoring Multiple Microprocessor
FF1
S
D₁ Q₁
CK Q₁
R
FF2
S
D₂ Q₂
CK₂ Q₂
R
FF3
S
D₃ Q₃
CK Q₃
R
R₂
R₁
*
*
*
RESET
RESET
RESET
RESET
CK
RESET
CK
RESET
CK
GND
GND
GND
*: Microprocessor
18
27
C_T
3
4
6
5
MB3773
Notes :
•
connects from FF1 and FF2 outputs Q₁ and Q₂ to the NOR input.
• Depending on timing, these connections may not be necessary.
•
Example
:
R₁
C_T


R₂  2.2
0.1 μF
kΩ
CK₁
Q₁
CK₂
Q₂
CK₃
Q₃
NOR
Output
Document Number: 002-08513 Rev. *A
V_CC (  5
Figure 1
Figure 2
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