name: 74ALS1643 function: Octal Bus Transceiver, Non&Invert, 3-state package: DIP,20 manufacturer: TI added-by: Long john Silicon +--()--+ DIR | 1 20| VCC A1 | 2 19| G! A2 | 3 18| B1 A3 | 4 17| B2 A4 | 5 16| B3 A5 | 6 15| B4 A6 | 7 14| B5 A7 | 8 13| B6 A8 | 9 12| B7 GND |10 11| B8 +------+ This information was added by a third party and may be incorrect. This pinout came from the Chipdir: http://www.chipdir.org/