The SN74LS283N is a high-speed 4-Bit Binary Full Adder with internal carry lookahead. It accepts two 4-bit binary words (A1–A4, B1–B4) and a Carry Input (C0). It generates the binary Sum outputs (R1–R4) and the Carry
Output (C4) from the most significant bit. The SN74LS283N operates with either active HIGH or active LOW operands (positive or negative logic).
16 pin DIP. Manufactured by Motorola.