MM74HC4538 Monostable Multivibrator Datasheet

MM74HC4538 Datasheet, PDF, Equivalent


Part Number

MM74HC4538

Description

Dual Retriggerable Monostable Multivibrator

Manufacture

Fairchild

Total Page 10 Pages
Datasheet
Download MM74HC4538 Datasheet


MM74HC4538
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 Xto the ordering code.
Connection Diagram
Truth Table
Inputs
Clear
A
LX
XH
XX
HL
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
B
X
X
L
H
Outputs
QQ
LH
LH
L H
© 2000 Fairchild Semiconductor Corporation DS005217
www.fairchildsemi.com

MM74HC4538
Block Diagrams
Note: Pin 1 and Pin 15 must be hard-wired to GND.
Logic Diagram
www.fairchildsemi.com
2


Features MM74HC4538 Dual Retriggerable Monostable Multivibrator February 1984 Revised A ugust 2000 MM74HC4538 Dual Retriggerab le Monostable Multivibrator General Des cription The MM74HC4538 high speed mono stable multivibrator (one shots) is imp lemented in advanced silicon-gate CMOS technology. They feature speeds compara ble to low power Schottky TTL circuitry while retaining the low power and high noise immunity characteristic of CMOS circuits. Each multivibrator features b oth a negative, A, and a positive, B, t ransition triggered input, either of wh ich can be used as an inhibit input. Al so included is a clear input that when taken low resets the one shot. The MM74 HC4538 is retriggerable. That is, it ma y be triggered repeatedly while their o utputs are generating a pulse and the p ulse will be extended. Pulse width stab ility over a wide range of temperature and supply is achieved using linear CMO S techniques. The output pulse equation is simply: PW = 0.7(R)(C) where PW is in seconds, R is in ohms.
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