+---+--+---+ +---+---+---+---*---+---+---+---+ Y4 |1 +--+ 16| VCC | S3| S2| S1| S0| Y0| Y1|...| Y9| Y2 |2 15| Y3 +===+===+===+===*===+===+===+===+ Y0 |3 14| Y1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | Y7 |4 13| S1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | Y9 |5 4028 12| S2 | . | . | . | . | 0 | 0 | . | 0 | Y5 |6 11| S3 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | Y6 |7 10| S0 | 1 | 0 | 1 | X | 0 | 0 | 0 | 0 | GND |8 9| Y8 | 1 | 1 | X | X | 0 | 0 | 0 | 0 | +----------+ +---+---+---+---*---+---+---+---+