Układy CMOS i TTL

4556 – Dwukrotne dekodery 1 z 4 z wyjściami aktywnymi w stanie niskim

1 Czas czytania (min)
     +---+--+---+            +---+---+---*---+---+---+---+
/1EN |1  +--+ 16| VCC        |/EN| S1| S0|/Y0|/Y1|/Y2|/Y3|
 1S0 |2       15| /2EN       +===+===+===*===+===+===+===+
 1S1 |3       14| 2S0        | 1 | X | X | 1 | 1 | 1 | 1 |
/1Y0 |4       13| 2S1        | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
/1Y1 |5  4556 12| /2Y0       | 0 | 0 | 1 | 1 | 0 | 1 | 1 |
/1Y2 |6       11| /2Y1       | 0 | 1 | 0 | 1 | 1 | 0 | 1 |
/1Y3 |7       10| /2Y2       | 0 | 1 | 1 | 1 | 1 | 1 | 0 |
 GND |8        9| /2Y3       +---+---+---*---+---+---+---+
     +----------+