Fairchild Semiconductor DM74LS154WMX, DM74LS154WM, DM74LS154N Datasheet

© 2000 Fairchild Semiconductor Corporation DS006394 www.fairchildsemi.com

August 1986
Revised March 2000

DM74LS154 4-Line to 16-Line Decoder/Demultiplexer

DM74LS154
4-Line to 16-Line Decoder/Demultiplexer

General Description

Each of these 4-line-to-16-line decoders utilize s TTL cir­cuitry to decode four bina ry-coded inputs into one of six­teen mutually exclusive outputs when both the strobe
inputs, G1 and G2, ar e LOW. The demultiplexing f unction
is performed by using the 4 input lines to address the out­put line, passing data from one of the strobe inputs with the
other strobe input LOW. When either strobe input i s HIGH,
all outputs are HIGH. These demultiplexers are ideally
suited for implementing hi gh-performan ce memory decod­ers. All inputs are buffer ed and input clamp ing diodes are
provided to minimiz e transmiss ion-line effects and th ereby
simplify system design.

Features

■ Decodes 4 binary-coded inp uts into one of 16 mutuall y
exclusive outputs

■ Performs the demultiplexing function by distributing data
from one input line to any one of 16 outputs

■ Input clamping diodes simplify system design

■ High fan-out, low-impedance, totem-pole outputs

■ Typical propagation delay

3 levels of logic 23 ns
Strobe 19 ns

■ Typical power dissipation 45 mW

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.

Connection Diagram Logic Diagram

Order Number Package Number Package Description

DM74LS154WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JED EC MS-013, 0.300 Wide
DM74LS154N N24A 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600 Wide

www.fairchildsemi.com 2

DM74LS154

Function Table

H = HIGH Level
L = Low Level
X = Don’t Care

Inputs Outputs

G1G2DCBA0123456789101112131415

L L L LL LLHHHHHHHHH H H H H H H
L L L LLHHLHHHHHHHH H H H H H H
L L L LHLHHLHHHHHHH H H H H H H
L L L LHHHHHLHHHHHH H H H H H H
L L LHLLHHHHLHHHHH H H H H H H
L L LHLHHHHHHLHHHH H H H H H H
L L LHHLHHHHHHLHHH H H H H H H
L L LHHHHHHHHHHLHH H H H H H H
L L HL LLHHHHHHHHLH H H H H H H
L L HL LHHHHHHHHHHL H H H H H H
L L HLHLHHHHHHHHHH L H H H H H
L L HLHHHHHHHHHHHH H L H H H H
L L HHL LHHHHHHHHHH H H L H H H
L L HHLHHHHHHHHHHH H H H L H H
L L HHHLHHHHHHHHHH H H H H L H
L L HHHHHHHHHHHHHH H H H H H L
L H XXXXHHHHHHHHHH H H H H H H
H L XXXXHHHHHHHHHH H H H H H H
H H XXXXHHHHHHHHHH H H H H H H