4038 Triple negative-edge-triggered serial adder. Each section can be used to add long binary words, one bit on each clock cycle. CRST resets the internal carry flip-flop after one clock delay. The INV inputs can be used to invert the sum output (giving a 1's-complemented result). +----------+ 3S |1 +--+ 16| VCC 3INV |2 15| 3A /CLK |3 14| 3B 2S |4 13| 2A 2INV |5 4038 12| 2B CRST |6 11| 1B 1INV |7 10| 1A GND |8 9| 1S +----------+ [This information is part of the GIICM]