name: HT93214BLT function: 1-Memory Tone/Pulse Dialer package: SKDIP22,22 manufacturer: Holtek +--()--+ LOCK | 1 22| NC HFO | 2 21| HFIB HKSB | 3 20| R4B MODE | 4 19| R3B X1 | 5 18| R2B X2 | 6 17| R1B VSS | 7 16| C3B VDD | 8 15| C2B DTMF | 9 14| C1B XMUTEB |10 13| POB MODEOB |11 12| KTB +------+ This pinout came from the Chipdir: http://www.chipdir.org/