I use the TP5089N DTMF generator and I am using a Digitran KL0054 keypad.  It
works fine.  A word of caution, however, the TP5089N is being end of lifed
soon, if it hasn't already.  If you are designing a new product for
production, you may want to look for an alternative for the device.

Good luck,
Max Toole,
Electronic Innovations, Inc.