Układy CMOS i TTL

4555 – Dwukrotne dekodery 1 z 4 z wyjściami aktywnymi w stanie wysokim

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 | 0 | 0 | 0 | 0 |
 1Y0 |4       13| 2S1        | 0 | 0 | 0 | 1 | 0 | 0 | 0 |
 1Y1 |5  4555 12| 2Y0        | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
 1Y2 |6       11| 2Y1        | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
 1Y3 |7       10| 2Y2        | 0 | 1 | 1 | 0 | 0 | 0 | 1 |
 GND |8        9| 2Y3        +---+---+---*---+---+---+---+
     +----------+