HD74AC283

HD74AC283/HD74ACT283 4-bit Binary Full Adder with Fast Carry Description The HD74AC283/HD74ACT283 high-speed 4-bit binary full adder with internal carry lookahead accepts two 4-bit binary works (A0 – A3, B0 – B 3) and a Carry input (C0). It generates the binary Sum outputs (S0 – S 3) and the Carry output (C4) from the most significant bit. The HD74AC283/HD74ACT283 will operate with either active High or active Low operands (positive or negative logic). Features Outputs Source/Sink 24 mA HD74ACT283 has TTL-Cmpatible Inputs Pin Arrangement S1 1 B1 2 A1 3 S0 4 A0 5 B0 6 C0 7 GND 8 (Top view) 16 VCC 15 B2 14 A2 13 S2 12 A3 11 B3 10 S3 9 C4 HD74AC283/HD74ACT283 Logic Symbol A0 B0 A1 B1 A2 B2 A3 B3 C0 C4 S0 S1 S2 S3 Pin Names A0 – A3 B0 – B3 C0 S0 – S3 C4 A Operand Inputs B Operand Inputs Carry Input Sum Outputs Carry Output Functional Description The HD74AC283/HD74ACT283 adds two 4-bit binary words (A plus B) plus the incoming Carry (C0). The binary sum appears on the Sum (S0 – S3) and outgoing carry (C4) outputs. The binary weight of the various inputs and outputs is indicated by the subscript numbers, representing powers of two. 20 (A0 + B0 + C0) + 21 (A1 + B1) + 22 (A2 + B2) + 23 (A3 + B3) = S0 + 2S1 + 4S2 + 8S3 + 16C4 Where (+) = plus Interchanging inputs of equal weight does not affect the operation. Thus C0, A0, B0 can be arbitrarily assigned to pins 5, 6 and 7 for DIPS. Due to the symmetry of the binary add function, the HD74AC283/HD74ACT283 can be used eit...