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參數資料
| 型號： | MM54HC4538J |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 諧振器 |
| 英文描述： | HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, CDIP16 |
| 封裝： | CERAMIC, DIP-16 |
| 文件頁數： | 1/10頁 |
| 文件大小： | 199K |
| 代理商： | MM54HC4538J |
MM74HC4538
Dual Retriggerable Monostable Multivibrator
General Description
The MM54HC4538/MM74HC4538 high speed monostable
multivibrators (one shots) are implemented in advanced
silicon-gate CMOS technology. They feature speeds compa-
rable 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 ’HC4538 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=0.7(R) (C) where PW is in
seconds, R is in ohms, and C is in farads. This device is pin
compatible with the CD4528, and the CD4538 one shots. All
inputs are protected from damage due to static discharge by
diodes to Vcc and ground.
Features
n
Schmitt trigger on A and B inputs
n
Wide power supply range: 2–6V
n
Typical trigger propagation delay: 32 ns
n
Fanout of 10 LS-TTL loads (74HC)
n
Low input current: 1 A max
Connection and Block Diagrams
Dual-In-Line Package
DS005217-1
Order Number MM54HC4538 or MM74HC4538
DS005217-2
Note: Pin 1 and Pin 15 must be hard-wired to GND.
April 1998
MM74HC4538
Dual
Retriggerable
Monostable
Multivibrator
1998 Fairchild Semiconductor Corporation
DS005217
www.fairchildsemi.com
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