7400

Quad 2-input NAND gates.

    +---+--+---+             +---+---*---+           __
 1A |1  +--+ 14| VCC         | A | B |/Y |      /Y = AB
 1B |2       13| 4B          +===+===*===+
/1Y |3       12| 4A          | 0 | 0 | 1 |
 2A |4  7400 11| /4Y         | 0 | 1 | 1 |
 2B |5       10| 3B          | 1 | 0 | 1 |
/2Y |6        9| 3A          | 1 | 1 | 0 |
GND |7        8| /3Y         +---+---*---+
    +----------+