dm74ls181 National Semiconductor Corporation, dm74ls181 Datasheet

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dm74ls181

Manufacturer Part Number
dm74ls181
Description
4-bit Arithmetic Logic Unit
Manufacturer
National Semiconductor Corporation
Datasheet
C 1995 National Semiconductor Corporation
DM54LS181 DM74LS181
4-Bit Arithmetic Logic Unit
General Description
The ’LS181 is a 4-bit Arithmetic Logic Unit (ALU) which can
perform all the possible 16 logic operations on two variables
and a variety of arithmetic operations
Connection Diagram
TL F 9821
Order Number DM54LS181J DM54LS181W or DM74LS181N
Pin Names
A0 – A3
B0 – B3
S0 – S3
M
C
F0 – F3
A
G
P
C
n
n
e
See NS Package Number J24A N24A or W24C
a
4
B
Dual-In-Line Package
Operand Inputs (Active LOW)
Operand Inputs (Active LOW)
Function Select Inputs
Mode Control Input
Carry Input
Function Outputs (Active LOW)
Comparator Output
Carry Generate Output (Active LOW)
Carry Propagate Output (Active LOW)
Carry Output
Features
Y
Y
Y
Description
Provides 16 arithmetic operations add subtract com-
pare double plus twelve other arithmetic operations
Provides all 16 logic operations of two variables exclu-
sive-OR compare AND NAND OR NOR plus ten
other logic operations
Full lookahead for high speed arithmetic operation on
long words
TL F 9821 – 1
RRD-B30M115 Printed in U S A
June 1992

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dm74ls181 Summary of contents

Page 1

... General Description The ’LS181 is a 4-bit Arithmetic Logic Unit (ALU) which can perform all the possible 16 logic operations on two variables and a variety of arithmetic operations Connection Diagram Order Number DM54LS181J DM54LS181W or DM74LS181N See NS Package Number J24A N24A or W24C Pin Names A0 – – – ...

Page 2

... Max CC Max B C GND DM54 DM74 DM74LS181 Units Nom Max Typ Min Max Units (Note ...

Page 3

Switching Characteristics Symbol Parameter t Propagation Delay PLH PHL Propagation Delay PLH PHL n t Propagation Delay PLH (Sum) PHL t ...

Page 4

Sum Mode Test Table I Input Symbol Under Apply Test PLH PHL t PLH PHL t PLH PHL t PLH PHL ...

Page 5

Logic Mode Test Table III Input Symbol Under Apply Test PLH PHL t PLH PHL Functional Description The ’LS181 is a 4-bit high speed parallel Arithmetic Logic Unit (ALU) Controlled by ...

Page 6

Logic Symbols Active High Operands TL F 9821 – 3 Active Low Operands TL F 9821 – Pin GND Pin ...

Page 7

Logic Diagram 7 ...

Page 8

8 ...

Page 9

... Physical Dimensions inches (millimeters) 24-Lead Molded Dual-In-Line Package (N) Package (J) Order Number DM54LS181J NS Package Number J24A Order Number DM74LS181N NS Package Number N24A 9 ...

Page 10

Physical Dimensions inches (millimeters) (Continued) 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 THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 ...

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