#74LS83

Description: 4-bit Full Adder

Datasheet: http://www.ti.com/lit/gpn/sn74LS83

Pinout:

    +-----------+
 A4 |[ 1]   [16]| B4
 S3 |[ 2]   [15]| S4
 A3 |[ 3]   [14]| C4
 B3 |[ 4]   [13]| C0
VCC |[ 5]   [12]| GND
 S2 |[ 6]   [11]| B1
 B2 |[ 7]   [10]| A1
 A2 |[ 8]    [9]| S1
    +-----------+