+---+--+---+ A3 |1 +--+ 16| VCC S=A+B+CIN B2 |2 15| B3 A2 |3 14| CO B1 |4 13| S3 A1 |5 4008 12| S2 B0 |6 11| S1 A0 |7 10| S0 GND |8 9| CI +----------+
+---+--+---+ A3 |1 +--+ 16| VCC S=A+B+CIN B2 |2 15| B3 A2 |3 14| CO B1 |4 13| S3 A1 |5 4008 12| S2 B0 |6 11| S1 A0 |7 10| S0 GND |8 9| CI +----------+