Description
The M-984-02 Special Information Tone Detector is a monolithic integrated circuit designed to provide reliable detection of many common telephone network status signals. In particular, it detects the signals known as Special Information Tones (SITs) or error tones as defined by the CCITT, and single tones often used as dial tone, audible ringing, and other general progress indications.

Features
• Detects single-frequency tones used for error
   indication and call progress in telephone systems
• Provides detection windows for:
   400/425 Hz (Call Progress)
   950 Hz (Special and error indication)
   1400 Hz (Special and error indication)
   1800 Hz (Special and error indication)
• Separate tri-state outputs for each tone window
• Inexpensive 3.58 MHz crystal time base
• Auxiliary 3.58 MHz clock output
• 14-pin DIP package and 16-pin SOIC package
• Single supply 3 to 5 volt (low power CMOS)
• Wide dynamic range (30 dBm)

Applications
• Automatic dialers
• Modems
• Telecom test equipment
• Telephone traffic measurement,
• Service evaluation
• Billing equipment