+---+--+---+ +---+---+---*---+ ___ 1A |1 +--+ 14| VCC | A | B | C |/Y | /Y = ABC 1B |2 13| 3C +===+===+===*===+ 2A |3 12| 3B | 0 | X | X | 1 | 2B |4 4023 11| 3A | 1 | 0 | X | 1 | 2C |5 10| /3Y | 1 | 1 | 0 | 1 | /2Y |6 9| /1Y | 1 | 1 | 1 | 0 | GND |7 8| 1C +---+---+---*---+ +----------+