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