7403

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Quad 2-input open-collector NAND gates

    +---+--+---+             +---+---*---+           __
 1A |1  +--+ 14| VCC         | A | B |/Y |      /Y = AB
 1B |2       13| 4B          +===+===*===+
/1Y |3       12| 4A          | 0 | 0 | Z |
 2A |4  7403 11| /4Y         | 0 | 1 | Z |
 2B |5       10| 3B          | 1 | 0 | Z |
/2Y |6        9| 3A          | 1 | 1 | 0 |
GND |7        8| /3Y         +---+---*---+
    +----------+