MM54HC253 MM74HC253 Dual 4-Channel TRI-STATE Multiplexer
January 1988
MM54HC253 MM74HC253
Dual 4-Channel TRI-STATE Multiplexer
General Description
The MM54HC253 MM74HC253 utilizes advanced silicon-
gate CMOS technology to achieve the low power consump-
tion and high noise immunity of standard CMOS integrated
circuits along with the capability to drive 10 LS-TTL loads
The large output drive and TRI-STATE features of this de-
vice make it ideally suited for interfacing with bus lines in
bus organized systems When the output control input is
taken high the multiplexer outputs are sent into a high im-
pedance state
When the output control is held low the associated multi-
plexer chooses the correct output channel for the given in-
put signals determined by the select A and B inputs
The 54HC 74HC logic family is functionally and pinout com-
patible with the standard 54LS 74LS logic family All inputs
are protected from damage due to static discharge by inter-
nal diode clamps to V
CC
and ground
Features
Y
Y
Y
Y
Y
Typical propagation delay 24 ns
Wide power supply range 2V 鈥?6V
Low quiescent current 80
mA
maximum (74HC Series)
Low input current 1
mA
maximum
Fanout of 10 LS-TTL loads
Connection Diagram
Dual-In-Line Package
TL F 5108 鈥?1
Order Number MM54HC253 or MM74HC253
Truth Table
Select
Inputs
B
X
L
L
L
L
H
H
H
H
A
X
L
L
H
H
L
L
H
H
C0
X
L
H
X
X
X
X
X
X
Data Inputs
C1
X
X
X
L
H
X
X
X
X
C2
X
X
X
X
X
L
H
X
X
C3
X
X
X
X
X
X
X
L
H
Output
Control
G
H
L
L
L
L
L
L
L
L
Output
Y
Z
L
H
L
H
L
H
L
H
Select inputs A and B are common to both sections
H
e
high level L
e
low level X
e
irrelevant Z
e
high impedance (off)
TRI-STATE is a registered trademark of National Semiconductor Corp
C
1995 National Semiconductor Corporation
TL F 5108
RRD-B30M105 Printed in U S A
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