name: HT93214CT function: 1-Memory Tone/Pulse Dialer package: DIP20,20 manufacturer: Holtek +--()--+ HKSB | 1 20| R4B MODE | 2 19| R3B X1 | 3 18| R2B X2 | 4 17| R1B VSS | 5 16| C3B VDD | 6 15| C2B DTMF | 7 14| C1B XMUTEB | 8 13| POB MODEOB | 9 12| KTB DOUT |10 11| CLOCK +------+ This pinout came from the Chipdir: http://www.chipdir.org/