The MX643 is a low power, low cost device that uses signal processing techniques to detect audible tone signals such as; Dial, Ring, Busy, Unobtainable, and other conditions found when placing a call throughout the world’s telecom systems. The detection of these Call Progress stages is essential to the proper operation and application of automatic calling products.

• International Special Information Tone Identification
• Worldwide Tone Compatibility • - 40°C to 85°C Operating Temp
• Single and Dual Tone Detected • Low Supply Current (0.3mA/0.5mA)
• U.S. Busy-Detect Output • Low Supply Voltage (3.3V/5.0V)
• Voice-Detect Output • Standard 3.58MHz Clock Input
• Wide Dynamic Range > 40dBm • Standard 8-pin DIP Package