This 74LS283 IC is a full adder that performs the addition of two 4-bit binary numbers. The sum (R) outputs are provided for each bit and the resultant carry (C4) is obtained from the fourth bit.
These adders feature a full internal look ahead across all four bits. This provides the system designer with partial lookahead performance at the economy and reduced package count of a ripple-carry implementation.
The adder logic, including the carry, is implemented in its
true form meaning that the end-around carry can be accomplished without the need for logic or level inversion.

Specification:

• Y Full-carry look-ahead across the four bits
• Y Systems achieve partial look-ahead performance with the economy of ripple carry
• Y Typical add times
  Two 8-bit words 25 ns
  Two 16-bit words 45 ns
• Y Typical power dissipation per 4-bit adder 95 mW
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Function: Binary Full Adder
• Mounting Style: Through Hole
• Number of Bits: 4
• Number of Channels: 1 Channel
• Supply Voltage - Max: 6 V
• Supply Voltage - Min: 2 V

To download the full datasheet of the 74LS83 Click Here