dm74ls156 National Semiconductor Corporation, dm74ls156 Datasheet

dm74ls156

Manufacturer Part Number

dm74ls156

Description

Dual 2-line To 4-line Decoders/demultiplexers

Manufacturer

National Semiconductor Corporation

Datasheet

1.DM74LS156.pdf (8 pages)

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C 1995 National Semiconductor Corporation

54LS155 DM54LS155 DM74LS155

54LS156 DM54LS156 DM74LS156

Dual 2-Line to 4-Line Decoders Demultiplexers

General Description

These TTL circuits feature dual 1-line-to-4-line demultiplex-

ers with individual strobes and common binary-address in-

puts in a single 16-pin package When both sections are

enabled by the strobes the common address inputs se-

quentially select and route associated input data to the ap-

propriate output of each section The individual strobes per-

mit activating or inhibiting each of the 4-bit sections as de-

sired Data applied to input C1 is inverted at its outputs and

data applied at C2 is true through its outputs The inverter

following the C1 data input permits use as a 3-to-8-line de-

coder or 1-to-8-line demultiplexer without external gating

Input clamping diodes are provided on these circuits to mini-

mize transmission-line effects and simplify system design

Connection Diagram and Function Tables

X X X

H L L

H L H

H H L

H H H

Select

L L L

L L H

L H L

L H H

B A

Inputs

Or Data

Strobe

1-Line-to-8-Line Demultiplexer

3-Line-to-8-Line Decoder or

Dual-In-Line Package

2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3

(0)

(1)

TL F 6395

(2)

Outputs

(3)

(4)

(5)

TL F 6395 – 1

(6)

(7)

Features

Select

Dual 2-to-4-line decoder

Dual 1-to-4-line demultiplexer

3-to-8-line decoder

1-to-8-line demultiplexer

Totem-pole (LS155)

Open-collector (LS156)

Applications

Individual strobes simplify cascading for decoding or

demultiplexing larger words

Input clamping diodes simplify system design

Choice of outputs

Alternate Military Aerospace device (54LS155 156) is

available Contact a National Semiconductor Sales Of-

fice Distributor for specifications

high level L

inputs C1 and C2 connected together

Order Number 54LS155DMQB 54LS155FMQB

inputs G1 and G2 connected together

DM74LS155M DM74LS155N 54LS156DMQB

54LS155LMQB DM54LS155J DM54LS155W

54LS156FMQB DM54LS156J DM54LS156W

See NS Package Number E20A J16A

Inputs

Strobe

1-Line-to-4-Line Demultiplexer

DM74LS156M or DM74LS156N

2-Line-to-4-Line Decoder or

low level X

M16A N16E or W16A

Data

don’t care

1Y0

2Y0

1Y1

2Y1

RRD-B30M105 Printed in U S A

Outputs

1Y2

2Y2

June 1989

1Y3

2Y3

Related parts for dm74ls156

dm74ls156 Summary of contents

Page 1

... Y available Contact a National Semiconductor Sales Of- fice Distributor for specifications Order Number 54LS155DMQB 54LS155FMQB 54LS155LMQB DM54LS155J DM54LS155W DM74LS155M DM74LS155N 54LS156DMQB 54LS156FMQB DM54LS156J DM54LS156W DM74LS156M or DM74LS156N See NS Package Number E20A J16A M16A N16E or W16A 2-Line-to-4-Line Decoder or 1-Line-to-4-Line Demultiplexer Inputs Select Strobe ...

Page 2

Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage Operating Free Air Temperature Range DM54LS and 54LS b DM74LS Storage Temperature Range b ...

Page 3

... Max (Note Units e L Min Max DM74LS156 Units Min Nom Max Typ Max Units (Note 100 ...

Page 4

Switching Characteristics and (See Section 1 for Test Waveforms and Output Load Symbol Parameter t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL ...

Page 5

5 ...

Page 6

Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS155DMQB 54LS156DMQB DM54LS155J or DM54LS156J Ceramic Leadless Chip Carrier (E) Order Number 54LS155LMQB NS Package Number E20A NS Package Number J16A 6 ...

Page 7

... Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) Order Number DM74LS155M or DM74LS156M 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS155N or DM74LS156N NS Package Number M16A NS Package Number N16E 7 ...

Page 8

Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS155FMQB 54LS156FMQB DM54LS155W or DM54LS156W LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN ...

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