#74LS283

Description: 4-bit full Adder

Datasheet: http://www.ti.com/lit/gpn/sn74LS283

Pinout:

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