name:         HT9302D
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
  LOCK | 6  19| MODE
    X1 | 7  18| DTMF
    X2 | 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/