74283 4-bit binary full adder with fast carry. +----------+ S2 |1 +--+ 16| VCC S=A+B+CIN B2 |2 15| B3 A2 |3 14| A3 S1 |4 74 13| S3 A1 |5 283 12| A4 B1 |6 11| B4 CIN |7 10| S4 GND |8 9| COUT +----------+ [This information is part of the GIICM]