74LS181

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 define...