74HC4538 View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
MFG CO.
74HC4538 Datasheet PDF : 10 Pages
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February 1984
Revised August 2000
MM74HC4538
Dual Retriggerable Monostable Multivibrator
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.
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
s Schmitt trigger on A and B inputs
s Wide power supply range: 2–6V
s Typical trigger propagation delay: 32 ns
s Fanout of 10 LS-TTL loads
s Low input current: 1 µA max
Ordering Code:
Order Number Package Number
Package Description
MM74HC4538M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
MM74HC4538SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC4538N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Truth Table
Inputs
Clear
A
B
L
X
X
X
H
X
X
X
L
H
L
↓
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
Outputs
Q
Q
L
H
L
H
L H
© 2000 Fairchild Semiconductor Corporation DS005217
www.fairchildsemi.com
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