name: HT9302B function: 1-Memory/2-Memory Tone/Pulse Dialer package: SKDIP22,22 manufacturer: Holtek +--()--+ HDIB | 1 22| HDO C1B | 2 21| R4B C2B | 3 20| R3B C3B | 4 19| R2B C4B | 5 18| R1B LOCK | 6 17| MODE X1 | 7 16| DTMF X2 | 8 15| POB XMUTEB | 9 14| HKSB VSS |10 13| VDD HFI |11 12| HFO +------+ This pinout came from the Chipdir: http://www.chipdir.org/