74639 8-bit 3-state/open-collector noninverting bus transceiver. Enable and direction pins control output enables. +----------+ DIR |1 +--+ 20| VCC A1 |2 19| /OE A2 |3 18| B1 A3 |4 17| B2 A4 |5 74 16| B3 A5 |6 639 15| B4 A6 |7 14| B5 A7 |8 13| B6 A8 |9 12| B7 GND |10 11| B8 +----------+ [This information is part of the GIICM]