74F181

74F181 4-Bit Arithmetic Logic Unit April 1988 Revised July 1999 74F181 4-Bit Arithmetic Logic Unit General Description The 74F181 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. It is 40% faster than the Schottky ALU and only consumes 30% as much power. Features s Full lookahead for high-speed arithmetic operation on long words Ordering Code: Order Number 74F181SC 74F181PC 74F181SPC Package Number M24B N24A N24C Package Description 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600 Wide 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbols Active-HIGH Operands Connection Diagram Active-LOW Operands IEEE/IEC © 1999 Fairchild Semiconductor Corporation DS009491 www.fairchildsemi.com 74F181 Unit Loading/Fan Out U.L. Pin Names A0–A3 B0–B3 S0–S3 M Cn F0–F3 A=B G P Cn + 4 Note 1: OC-Open Collector Description HIGH/LOW A Operand Inputs (Active LOW) B 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 1.0/3.0 1.0/3.0 1.0/4.0 1.0/1.0 1.0/5.0 50/33.3 OC (Note 1)/33.3 50/33.3 50/33.3 50/33.3 ...