This part is a kind of semiconductor called 74LS83A.

Function of this product has 4-BIT BINARY FULL ADDER.

Manufacturers : Motorola

Image and pinout :

Some of the text within the PDF file :

4-BIT BINARY FULL ADDER WITH FAST CARRY The SN54 / 74LS83A 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 ∑1 – ∑4) and the Carry Output (C4) from the most significant bit. The LS83A operates with either active HIGH or active LOW operands (positive or negative logic). The SN54 / 74LS283 is recommended for new designs since it is identical in function with this device and features standard corner power pins. CONNECTION DIAGRAM DIP (TOP VIEW) B4 Σ4 C4 C0 GND B1 A1 Σ1 16 15 14 13 12 11 10 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 12 A4 Σ3 3 4 56 A3 B3 VCC Σ2 78 B2 A2 PIN NAMES LOADIN [ ... ]

74LS83A PDF Datasheet Download