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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.
M-991 Maximum Ratings
Storage Temperature
-55 to 125
Operating Ambient Temperature
-25 to 70
Operating Ambient Temperature for the M-991-02SM
-40to 85
VDD
7.0V
Any Input Voltage
VSS -0.6 to VDD +0.6V
Note: 1. Exceeding these ratings may permanently damage the M-991.
M-991 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
M-991 Typical Application
• Telephone systems • Test equipment • Callback • Security systems • Billing systems