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74HC4538

更新时间： 2024-11-28 22:53:15
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 振荡器
页数 文件大小 规格书
10页 121K
描述
Dual Retriggerable Monostable Multivibrator

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74HC4538 数据手册

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February 1984  
Revised August 2000  
MM74HC4538  
Dual Retriggerable Monostable Multivibrator  
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.  
General Description  
The MM74HC4538 high speed monostable multivibrator  
(one shots) is implemented in advanced silicon-gate  
CMOS technology. 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 MM74HC4538 is  
retriggerable. That is, it may be triggered repeatedly while  
their outputs are generating a pulse and the pulse will be  
extended.  
Features  
■ Schmitt trigger on A and B inputs  
■ Wide power supply range: 2–6V  
■ Typical trigger propagation delay: 32 ns  
■ Fanout of 10 LS-TTL loads  
■ Low input current: 1 µA max  
Ordering Code:  
Order Number  
MM74HC4538M  
MM74HC4538SJ  
MM74HC4538N  
Package Number  
M16A  
Package Description  
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow  
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide  
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide  
M16D  
N16E  
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.  
Connection Diagram  
Truth Table  
Inputs  
Outputs  
Clear  
A
X
H
X
L
B
X
X
L
Q
L
L
L
Q
H
H
H
L
X
X
H
H
↓
↑
H
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  
© 2000 Fairchild Semiconductor Corporation  
DS005217  
www.fairchildsemi.com  
1234567...10

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