M-991 Call Progress Tone Generator Features Generates standard call progress tones Digital input control Linear (analog) output Power output capable of driving standard line 14-pin DIP and 16-pin SOIC package types Single supply 5V CMOS (low power) Inexpensive 3.
58 MHz time base Temperature range from -25ºC to 70ºC (-01 version) • Temperature range from -40ºC to 85ºC (-02 version) • • • • • • • • Applications • • • • • Telephone systems Test equipment Callback Security systems Billing systems Description The M-991 is a call progress tone generator integrated circuit for use in telephone systems.
The circuit uses low-power CMOS techniques to generate tones which are digitally controlled and h...

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