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HD74HC221 Datasheet

  • HD74HC221

  • Dual Monostable Multivibrators (with Schmitt Trigger Input)

  • 8頁

  • HITACHI

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HD74HC221
Dual Monostable Multivibrators (with Schmitt Trigger Input)
Description
Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which
can be used as an inhibit. Also included is a clear inpt that when taken low resets the one shot. The
HD74HC221 can be triggered on the positive transition of teh clear while A is held low and B is held high.
This device is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out.
The output pulse equation is simply:
t
W
= 0.7路(Rext)路(Cext)
Features
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High Speed Operation
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 碌A max
Low Quiescent Supply Current
Function Table
Inputs
Clear
L
X
X
H
H
L
A
X
H
X
L
H
H
B
X
X
L
Outputs
Q
L
L
L
Q
H
H
H

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