MC74HC4538A
TYPICAL APPLICATIONS
C
X
RISING−EDGE
TRIGGER
R
X
V
CC
Q
Q
RISING−EDGE
TRIGGER
C
X
R
X
V
CC
Q
Q
A
B
B = V
CC
RESET = V
CC
A
B
RESET = V
CC
C
X
R
X
V
CC
Q
FALLING−EDGE
TRIGGER
C
X
R
X
V
CC
Q
A = GND
A
B
Q
B
FALLING−EDGE
TRIGGER
RESET = V
CC
Q
RESET = V
CC
Figure 14. Retriggerable Monostable Circuitry
Figure 15. Non−retriggerable Monostable Circuitry
GND
A = GND
N/C
R
X
C
X
Q
V
CC
N/C
N/C
B
Q
RESET
Figure 16. Connection of Unused Section
ONE−SHOT SELECTION GUIDE
100 ns
MC14528B
MC14536B
MC14538B
MC14541B
HC4538A*
1
ms
10
ms
100
ms
1 ms 10 ms 100 ms 1 s
10 s
23 HR
5 MIN
*Limited operating voltage (2 −6 V)
TOTAL OUTPUT PULSE WIDTH RANGE
RECOMMENDED PULSE WIDTH RANGE
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