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MM54C221N Datasheet

  • MM54C221N

  • Dual Monostable Multivibrator

  • 150.78KB

  • 6頁

  • NSC

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MM54C221 MM74C221 Dual Monostable Multivibrator
February 1988
MM54C221 MM74C221 Dual Monostable Multivibrator
General Description
The MM54C221 MM74C221 dual monostable multivibrator
is a monolithic complementary MOS integrated circuit Each
multivibrator features a negative-transition-triggered input
and a positive-transition-triggered input either of which can
be used as an inhibit input and a clear input
Once fired the output pulses are independent of further
transitions of the A and B inputs and are a function of the
external timing components C
EXT
and R
EXT
The pulse
width is stable over a wide range of temperature and V
CC
Pulse stability will be limited by the accuracy of external
timing components The pulse width is approximately de-
fined by the relationship t
W(OUT)
C
EXT
R
EXT
For further
information and applications see AN-138
Features
Y
Y
Y
Y
Wide supply voltage range
Guaranteed noise margin
High noise immunity
Low power TTL compatibility
4 5V to 15V
1 0V
0 45 V
CC
(typ )
fan out of 2
driving 74L
Connection Diagrams
Timing Component
Dual-In-Line Package
TL F 5904 鈥?1
TL F 5904 鈥?2
Top View
Order Number MM54C221 or MM74C221
Truth Table
Inputs
Clear
L
X
X
H
H
A
X
H
X
L
B
X
X
L
Q
L
L
L
Outputs
Q
H
H
H
H
L
e
e
e
e
e
e
e
u
v
X
u
H
High level
Low level
Transition from low to high
Transition from high to low
One high level pulse
One low level pulse
Irrelevant
v
C
1995 National Semiconductor Corporation
TL F 5904
RRD-B30M105 Printed in U S A

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