name: HT604L function: 3**18 Series of Decoders package: DIP/SOP20,20 manufacturer: Holtek +--()--+ A11 | 1 20| VDD D12 | 2 19| A9 D13 | 3 18| A8 D14 | 4 17| A7 D15 | 5 16| A6 VT | 6 15| A4 DIN | 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/