name: HT600 function: 3**18 Series of Encoders package: DIP/SOP20,20 manufacturer: Holte +--()--+ AD11 | 1 20| VDD AD12 | 2 19| A9 AD13 | 3 18| A8 AD14 | 4 17| A7 AD15 | 5 16| A6 DOUT | 6 15| A4 TE | 7 14| A3 OSC2 | 8 13| A2 OSC1 | 9 12| A1 VSS |10 11| A0 +------+ This pinout came from the Chipdir: http://www.chipdir.org/