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參數(shù)資料
| 型號： | MM54HC123A |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Dual Retriggerable Monostable Multivibrator(雙通道可再觸發(fā)的單穩(wěn)態(tài)多諧振蕩器) |
| 中文描述： | 雙Retriggerable單穩(wěn)態(tài)觸發(fā)器（雙通道可再觸發(fā)的單穩(wěn)態(tài)多諧振蕩器） |
| 文件頁數(shù)： | 1/6頁 |
| 文件大小： | 198K |
| 代理商： | MM54HC123A |
TL/F/5206
M
January 1988
MM54HC123A/MM74HC123A
Dual Retriggerable Monostable Multivibrator
General Description
The MM54/74HC123A high speed monostable multivibra-
tors (one shots) utilize advanced silicon-gate CMOS tech-
nology. They feature speeds comparable to low power
Schottky TTL circuitry while retaining the low power and
high noise immunity characteristic of CMOS circuits.
Each multivibrator features both a negative, A, and a posi-
tive, 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 shot. The ’HC123 can be
triggered on the positive transition of the clear while A is
held low and B is held high.
The ’HC123A 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 and
supply is achieved using linear CMOS techniques. The out-
put pulse equation is simply: PW
e
(R
EXT
) (C
EXT
); where PW
is in seconds, R is in ohms, and C is in farads. All inputs are
protected from damage due to static discharge by diodes to
V
CC
and ground.
Features
Y
Typical propagation delay: 25 ns
Y
Wide power supply range: 2V–6V
Y
Low quiescent current: 80
m
A maximum (74HC Series)
Y
Low input current: 1
m
A maximum
Y
Fanout of 10 LS-TTL loads
Y
Simple pulse width formula T
e
RC
Y
Wide pulse range: 400 ns to
%
(typ)
Y
Part to part variation:
g
5% (typ)
Y
Schmitt Trigger A & B inputs enable infinite signal input
rise and fall times.
Connection Diagram
Dual-In-Line Package
TL/F/5206–1
Top View
Order Number MM54HC123A or MM74HC123A
Timing Component
TL/F/5206–2
Note:
Pin 6 and Pin 14 must be
hard-wired to GND.
Truth Table
Inputs
Outputs
Clear
A
B
Q
Q
L
X
X
H
H
u
X
H
X
L
v
L
X
X
L
u
H
H
L
L
L
H
H
H
é
é
é
H
e
High Level
e
Low Level
u
e
Transition from Low to High
v
e
Transition from High to Low
é
e
One High Level Pulse
e
One Low Level Pulse
X
e
Irrelevant
L
C
1995 National Semiconductor Corporation
RRD-B30M105/Printed in U. S. A.
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| MM74HC123A | Dual Retriggerable Monostable Multivibrator(雙通道可再觸發(fā)的單穩(wěn)態(tài)多諧振蕩器) |
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| MM54HC123AJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Retriggerable Monostable Multivibrator |
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