Description
The M-985-01 is an integrated circuit precise tone detector for call progress and special information tones (SIT), as defined by CCITT.
The use of integrated circuit techniques allows the M-985-01 to pack the eight filters for call progress detection into a single 22-pin DIP or a 20-pin SOIC. A 3.58 MHz crystal-controlled time base guarantees accuracy and repeatability.

Features
• Precise detection of call progress tones
• Linear (analog) input
• Digital (CMOS compatible), tri-state outputs
• 22-pin DIP and 20-pin SOIC
• Single supply 3 to 5 volt (low power CMOS)
• Inexpensive 3.58 MHz crystal time base
• Wide dynamic range (30 dB)
• Lower power consumption (power-down mode)
• 425 Hz detection
• Special Information Tone (SIT) Detection

Applications
• Automatic dialers
• Dialing modems
• Traffic measurement equipment
• Test equipment
• Service evaluation
• Billing systems