name: HT9305BR function: 5-Memory with ABR Tone/Pulse Dialer package: SKDIP28,28 manufacturer: Holtek +--()--+ LEDB | 1 28| ALARM RINGB | 2 27| AIN HDIB | 3 26| HDO C1B | 4 25| R4B C2B | 5 24| R3B C3B | 6 23| R2B C4B | 7 22| R1B C5B | 8 21| MODE X1 | 9 20| DTMF X2 |10 19| POB XMUTEB |11 18| HKSB VSS |12 17| VDD HFI |13 16| HFO LOCKB |14 15| HKOPT +------+ This pinout came from the Chipdir: http://www.chipdir.org/