This part is a kind of semiconductor called 74LS83.

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

Manufacturers : Motorola

Image and pinout :

Some of the text within the PDF file :

SN54/74LS83A 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, B 1 – 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 16 Σ4 15 C4 14 C0 13 GND 12 B1 11 A1 10 Σ1 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 4-BIT BINARY FULL ADDER WITH FAST CARRY LOW POW [ ... ]

74LS83 PDF Datasheet Download