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V
( 5 V)
CC
MB3773
1
2
C
T
3
4
(a) T
reduction method
PR
Notes :
RESET is the only output that can be used.
Standard T
Formulas: T
The above formulas become standard values in determining T
Reset hold time is compared below between the reduction circuit and the standard circuit.
C
0.1 F
T
T
: =
PR
T
: =
WD
T
: =
WR
EXAMPLE 9: Reducing Reset Hold Time
Logic circuit
8
RESET
7
RESET
6
CK
GND
5
, T
and T
value can be found using the following formulas.
PR
WD
WR
(ms) : = 100
C
( F)
T
PR
T
(ms) : = 100
C
( F)
T
WD
T
(ms) : = 16
C
( F)
T
WR
T
reduction circuit
PR
10 ms
10 ms
1.6 ms
V
(
5 V)
CC
MB3773
1
8
2
7
C
3
6
T
4
5
(b) Standard usage
PR
Standard circuit
100 ms
10 ms
2.0 ms
MB3773
Logic circuit
RESET
RESET
CK
GND
, T
and T
.
WD
WR
21
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