dm74ls42 National Semiconductor Corporation, dm74ls42 Datasheet

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dm74ls42

Manufacturer Part Number
dm74ls42
Description
Bcd/decimal Decoders
Manufacturer
National Semiconductor Corporation
Datasheet
C 1995 National Semiconductor Corporation
54LS42 DM54LS42 DM74LS42 BCD Decimal Decoders
General Description
These BCD-to-decimal decoders consist of eight inverters
and ten four-input NAND gates The inverters are connect-
ed in pairs to make BCD input data available for decoding
by the NAND gates Full decoding of input logic ensures
that all outputs remain off for all invalid (10–15) input condi-
tions
Connection Diagram
Logic Diagram
DM54LS42J DM54LS42W DM74LS42M or DM74LS42N
See NS Package Number J16A M16A N16E or W16A
Order Number 54LS42DMQB 54LS42FMQB
Dual-In-Line Package
TL F 6365
TL F 6365 – 1
Features
Y
Y
Y
Y
Function Table
H
L
No
e
e
N
V
A
D
0
1
2
3
4
5
6
7
8
9
L
I
I
Diode clamped inputs
Also for applications as 4-line-to-16-line decoders 3-
line-to-8-line decoders
All outputs are high for invalid input conditions
Alternate Military Aerospace device (54LS42) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Low Level
High Level
D C B A
H
H
H H
H H
H H H
H H H H H H H H H H H H H H
H
H
L
L
L
L
L
L
L
L
BCD Inputs
H
H
H H
H H H H H H H H H H
L
L
L
L
L
L
L
L
H
H H H H H
H
H H H H H H H H H H H H
L
L
L
L
L
L
L
L
H H
H H H H H H
H H H H H H H H H H
H H H H H H H H H H H
L
L
L
L
L
L
L
L
H H
H H H H
H H H H H H
H H H H H H H H
H H H H H H H H H H
H H H H H H H H H H
H H H H H H H H H H
0
L
H H H H H H H H H
L
1
H H H H H H H H
2
L
Decimal Outputs
TL F 6365 – 2
H H H H H H H
3
L
H H H H H H
4
L
RRD-B30M105 Printed in U S A
H H H H H
5
L
H H H H
6
L
June 1989
H H H
7
L
H H
8
L
H
9
L

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dm74ls42 Summary of contents

Page 1

... DM54LS42 DM74LS42 BCD Decimal Decoders General Description These BCD-to-decimal decoders consist of eight inverters and ten four-input NAND gates The inverters are connect pairs to make BCD input data available for decoding by the NAND gates Full decoding of input logic ensures that all outputs remain off for all invalid (10– ...

Page 2

... Max Max Max DM54 (Note 2) DM74 b V Max (Note DM74LS42 Units Min Nom Max Typ Max Units (Note ...

Page 3

Switching Characteristics Symbol Parameter t Propagation Delay Time PHL High to Low Level Output t Propagation Delay Time PHL High to Low Level Output t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PLH Low ...

Page 4

Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS42DMQB or DM54LS42J NS Package Number J16A 4 ...

Page 5

... Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS42M NS Package Number M16A Order Number DM74LS42N NS Package Number N16E 5 ...

Page 6

Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS42FMQB or DM54LS42W LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF ...

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