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