name: HT9302DT function: 1-Memory/2-Memory Tone/Pulse Dialer package: SKDIP24,24 manufacturer: Holtek +--()--+ HDIB | 1 24| HDO C1B | 2 23| R4B C2B | 3 22| R3B C3B | 4 21| R2B C4B | 5 20| R1B KT | 6 19| MODE X1 | 7 18| DTMF X1 | 8 17| POB XMUTEB | 9 16| HKSB VSS |10 15| VDD HFI |11 14| HFO DOUT |12 13| CLOCK +------+ This pinout came from the Chipdir: http://www.chipdir.org/