4-Bit Arithmetic Logic - National Semiconductor
Description
DM54LS181 DM74LS181 4-Bit Arithmetic Logic Unit
June 1992
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
Features
Y Y
Y
Provides 16 arithmetic operations add subtract compare double plus twelve other arithmetic operations Provides all 16 logic operations of two variables exclusive-OR compare AND NAND OR NOR plus ten other logic operations Full lookahead for high speed arithmetic operation on long words
Connection Diagram
Dual-In-Line Package
TL F 9821 – 1
Order Number DM54LS181J DM54LS181W or DM74LS181N See NS Package Number J24A N24A or W24C
Pin Names A0 – A3 B0 – B3 S0–S3 M Cn F0– F3 AeB G P Cn a 4
Description 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
C1995 National Semiconductor Corporation
TL F 9821
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings (Note)
Supply Voltage Input Voltage Operating Free Air Temperature Range DM74LS Storage Temperature Range 7V 7V 0 C to a 70 C
b 65 C to a 150 C
Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed The device should not be operated at these limits The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation
Recommended Operating Conditions
Symbol VCC VIH VIL IOH IOL TA Parameter Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature
b 55
DM54LS181 Min 45 2 07
b0 4
DM74LS181 Min 4 75 2 08
b0 4
Units Max 5 25 V ...
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