M54HC4538
M74HC4538
October 1993
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
B1R
(Plastic Package)
ORDER CODES :
M54HC4538F1R M74HC4538M1R
M74HC4538B1R M74HC4538C1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
.HIGH SPEED
tPD = 25 ns (TYP.) AT VCC =5V
.LOW POWER DISSIPATION
STANDBY STATEI
CC
=4µA(MAX.)ATT
A
=25°C
ACTIVE STATE I
CC
=200µA(TYP.)ATV
CC
=5V
.HIGH NOISE IMMUNITY
VNIH =VNIL =28%VCC (MIN.)
.OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.BALANCED PROPAGATION DELAYS
tPLH =tPHL
.WIDE OUTPUT PULSE WIDTH RANGE
t
WOUT
= 120 ns ~ 60 s OVER AT V
CC
= 4.5 V
.OUTPUT PULSE WIDTH INDEPENDENT
FROM TRIGGER INPUT PULSE WIDTH
.PIN AND FUNCTION COMPATIBLE
WITH 4538B
The M54/74HC4538 is a high speed CMOS DUAL
MONOSTABLEMULTIVIBRATOR fabricated insili-
con gate C
2
MOS technology. It has the same high
speed performance of LSTTL combined with true
CMOS low power consumption. Each multivibrator
features both a negative, A, and a positive, B, edge
triggered input, either of which can be used as an in-
hibit input. Also included is a clear input that when
taken low resets the one shot. The monostable
multivibrators are retriggerable. That is,they may be
triggered reapeatedly while their outputs are gener-
ating 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 output pulse equation is simply :
PW = 0.7 (R)(C) where PW is in seconds, R in
Ohms, and C is in Farads.
All inputs are equipped with protection circuits
against static discharge and transient excess volt-
age.
DESCRIPTION
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