HD74HC4538
Dual Precision Retriggerable/Resettable Monostable
Multivibrators
Description
Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which
can be used as an inhibit input. Also included is a clear input that when taken low resets the one short. The
HD74HC4538 is retriggerable. That is, it may be triggered repeatedly while their outputs are generating a
pulse and the pulse will be extended.
Pulse width stability over a wide range of temperature. The output pulse equation is simply: t
w
= 0.7 (R)
(C).
Features
•
•
•
•
•
High Speed Operation: t
pd
(A or B to Y) = 22 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current
Function Table
Inputs
C
D
L
H
H
H
H
X :
Irrelevant
H
L
A
X
L
H
Not triggered
Not triggered
B
X
Outputs
Q
L
Q
H
HD74HC4538
Absolute Maximum Ratings
Item
Supply voltage range
Input voltage
Output voltage
DC input diode current
DC input diode current pin 2, 14
DC output diode current
DC current drain per pin
DC current drain per V
CC
, GND
Power dissipation per package
Storage temperature
Symbol
V
CC
Vin
Vout
I
IK
I
IK
I
OK
Iout
I
CC
, I
GND
P
T
Tstg
Rating
–0.5 to +7.0
–0.5 to V
CC
+ 0.5
–0.5 to V
CC
+ 0.5
±20
±30
±20
±25
±50
500
–65 to +150
Unit
V
V
V
mA
mA
mA
mA
mA
mW
°C
4
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