7418 Dual 4-input NAND gates with schmitt-trigger inputs. 0.8V typical input hysteresis at VCC=+5V. +----------+ +-------------------+ ____ 1A |1 +--+ 14| VCC | A | B | C | D |/Y | /Y = ABCD 1B |2 13| 2D |---+---+---+---+---| |3 12| 2C | 0 | X | X | X | 1 | 1C |4 7418 11| | 1 | 0 | X | X | 1 | 1D |5 10| 2B | 1 | 1 | 0 | X | 1 | /1Y |6 9| 2A | 1 | 1 | 1 | 0 | 1 | GND |7 8| /2Y | 1 | 1 | 1 | 1 | 0 | +----------+ +-------------------+ [This information is part of the GIICM]