name:         HT93215AT
function:     1-Memory Tone/Pulse Dialer
package:      DIP18,18
manufacturer: Holtek

       +--()--+
  HKSB | 1  18| R4B
  MODE | 2  17| R3B
    X1 | 3  16| R2B
    X2 | 4  15| R1B
   VSS | 5  14| C3B
   VDD | 6  13| C2B
  DTMF | 7  12| C1B
XMUTEB | 8  11| POB
MODEOB | 9  10| KTB
       +------+


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