name:         HT93215DL
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
  DOUT |11  12| CLOCK
       +------+


This pinout came from the Chipdir:
http://www.chipdir.org/