In SX Microcontrollers, SX/B Compiler and SX-Key Tool, johncouture wrote:

Another alternative to using an SX for DTMF is the TP5088 DTMF Generator Chip from National Semiconductor.  PDIP 14, about $4.  

Source:[url=http://wulfden.org/TheShoppe/misc.shtml]http://wulfden.org/TheShoppe/misc.shtml[/url]

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