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 highly linear. The M-991 is designed to permit operation with almost any system. The use of integrated circuit techniques allows the M-991 to incorporate the control, tone generating, and power output buffer into a single 14-pin DIP or a 16-pin SOIC. A 3.58-MHz (color burst) crystal-controlled time base guarantees accuracy and repeatability.
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
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