4503 2/4-bit 3-state noninverting buffer/line driver. +----------+ +-----------+ /1OE |1 +--+ 16| VCC |/OE| A | Y | 1A1 |2 15| /2OE |---+---+---| 1Y1 |3 14| 2A2 | 1 | X | Z | 1A2 |4 13| 2Y2 | 0 | 0 | 0 | 1Y2 |5 4503 12| 2A1 | 0 | 1 | 1 | 1A3 |6 11| 2Y1 +-----------+ 1Y3 |7 10| 1A4 GND |8 9| 1Y4 +----------+ [This information is part of the GIICM]