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參數(shù)資料
| 型號： | 74C221 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Dual Monostable Multivibrator |
| 中文描述： | 雙單穩(wěn)態(tài)觸發(fā)器 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 65K |
| 代理商： | 74C221 |
November 1987
Revised January 1999
M
1999 Fairchild Semiconductor Corporation
DS005904.prf
www.fairchildsemi.com
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)
≈
C
EXT
R
EXT
. For fur-
ther information and applications, see AN-138.
Features
I
Wide supply voltage range:
I
Guaranteed noise margin:
I
High noise immunity:
4.5V to 15V
1.0V
0.45 V
CC
(typ.)
fan out of 2 driving 74L
I
Low power TTL compatibility:
Ordering Code:
Connection Diagrams
Timing Component
Pin Assignments for DIP
Top View
Truth Table
H
=
HIGH Level
L
=
LOW Level
↑
=
Transition from LOW-to-HIGH
↓
=
Transition from HIGH-to-LOW
=
One HIGH level pulse
=
One LOW level pulse
X
=
Irrelevant
Order Number
74MMC221N
Package Number
N16E
Package Description
16-Lead Plastic Dual-in-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Inputs
Outputs
Q
L
L
L
Clear
L
X
X
H
H
A
X
H
X
L
↓
B
X
X
L
↑
H
Q
H
H
H
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