Brief Description
The FX633 detects the audible tone signals used by most of the worlds Telecom Systems to indicate Dial, Ringing, Busy and other conditions found when placing a call. Detection of these call progress stages is essential to the proper operation of automatic calling products.

Features
• Worldwide Tone Compatibility
• Single and Dual Tones Detected
• Special US Busy-Detect Output
• Special Voice-Detect Output
• Wide Dynamic Signal Range
• Low Voltage Operation
• Standard 8-Pin DIP Package
• Standard 3.58MHz Xtal