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M-991 Datasheet, PDF (1/6 Pages) Clare, Inc. – 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 ver-
sion)
• Temperature range from -40ºC to 85ºC (-02 ver-
sion)
Applications
• Telephone systems
• Test equipment
• Callback
• Security systems
• Billing systems
M-991
Call Progress Tone Generator
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.
Ordering Information
Part #
M-991
M-991-01SM
M-991-01SMTR
M-991-02SM
M-991-02SMTR
Description
14-pin plastic DIP
16-pin SOIC
16-pin SOIC Tape and Reel
16-pin SOIC, Extended
Temperature Range
16-pin SOIC, Extended
Temperature Range, Tape and
Reel
Pin Assignments
Block Diagram
DS-M991-R1
www.clare.com
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