7424 Quad 2-input NAND gates with schmitt-trigger line-receiver inputs. 0.8V typical input hysteresis at VCC=+5V. +----------+ +-----------+ __ 1A |1 +--+ 14| VCC | A | B |/Y | /Y = AB 1B |2 13| 4B |---+---+---| /1Y |3 12| 4A | 0 | 0 | 1 | 2A |4 7424 11| /4Y | 0 | 1 | 1 | 2B |5 10| 3B | 1 | 0 | 1 | /2Y |6 9| 3A | 1 | 1 | 0 | GND |7 8| /3Y +-----------+ +----------+ [This information is part of the GIICM]