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74MMC221N Datasheet

  • 74MMC221N

  • Dual Monostable Multivibrator

  • 6頁

  • FAIRCHILD

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MM74C221 Dual Monostable Multivibrator
November 1987
Revised January 1999
MM74C221
Dual Monostable Multivibrator
General Description
The MM74C221 dual monostable multivibrator is a mono-
lithic complementary MOS integrated circuit. Each multivi-
brator 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
defined by the relationship t
W(OUT)
鈮?/div>
C
EXT
R
EXT
. For fur-
ther information and applications, see AN-138.
Features
s
Wide supply voltage range:
s
Guaranteed noise margin:
s
High noise immunity:
4.5V to 15V
1.0V
0.45 V
CC
(typ.)
fan out of 2 driving 74L
s
Low power TTL compatibility:
Ordering Code:
Order Number
74MMC221N
Package Number
N16E
Package Description
16-Lead Plastic Dual-in-Line Package (PDIP), JEDEC MS-001, 0.300鈥?Wide
Connection Diagrams
Timing Component
Truth Table
Inputs
Clear
L
X
X
H
H
A
X
H
X
L
鈫?/div>
B
X
X
L
鈫?/div>
H
Outputs
Q
L
L
Q
H
H
Pin Assignments for DIP
H
=
HIGH Level
=
One HIGH level pulse
L
=
LOW Level
=
One LOW level pulse
鈫?=
Transition from LOW-to-HIGH
X= Irrelevant
鈫?=
Transition from HIGH-to-LOW

L
H
Top View
漏 1999 Fairchild Semiconductor Corporation
DS005904.prf
www.fairchildsemi.com

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    Dual Monostable Multivibrator
    FAIRCHILD
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