MM54HCT151 MM74HCT151 8-Channel Digital Multiplexer
November 1995
MM54HCT151 MM74HCT151
8-Channel Digital Multiplexer
General Description
This high speed Digital multiplexer utilizes advanced silicon-
gate CMOS technology Along with the high noise immunity
and low power dissipation of standard CMOS integrated cir-
cuits it possesses the ability to drive 10 LS-TTL loads The
MM54HCT151 MM74HCT151 selects one of the 8 data
sources depending on the address presented on the A B
and C inputs It features both true (Y) and complement (W)
outputs The STROBE input must be at a low logic level to
enable this multiplexer A high logic level at the STROBE
forces the W output high and the Y output low
MM54HCT MM74HCT devices are intended to interface be-
tween TTL and NMOS components and standard CMOS
devices These parts are also plug-in replacements for LS-
TTL devices and can be used to reduce power consumption
in existing designs
Features
Y
Y
Y
Y
Y
Typical propagation delay 20 ns
Low quiescent supply current 40
mA
maximum
(74HCT Series)
Low input current 1
mA
maximum
Fanout of 10 LS-TTL loads
TTL input compatible
Connection and Logic Diagrams
Dual-In-Line Package
Truth Table
Inputs
C
X
L
L
L
L
H
H
H
H
Select
B
X
L
L
H
H
L
L
H
H
A
X
L
H
L
H
L
H
L
H
Strobe
S
H
L
L
L
L
L
L
L
L
Outputs
Y
L
D
D
D
D
D
D
D
D
W
H
D
D
D
D
D
D
D
D
TL F 9399 鈥?1
H
e
High Level L
e
Low Level X
e
Don鈥檛 Care
D0 D1 D7
e
the level of the respective D input
Top View
Order Number MM54HCT151 or MM74HCT151
TL F 9399 鈥?2
C
1995 National Semiconductor Corporation
TL F 9399
RRD-B30M115 Printed in U S A
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