FX623

the FX623 is a low-power decoding microcircuit that measures the frequency of telephone system call progress tones.

With progress signals input from the telephone line,FX623 single-chip product is programmed to recognize up to thirteen of the World's most commonly used call-progress frequencies, analyze signal quality and present the measured result as a 4-bit parallel data word at the tri-state Data Output.

Using the parallel information from the FX623, the host system suitably configured, can recognize such call progress information as: 'Dial', 'Busy', 'Number Unobtainable', 'Ringing' and Fax/Modem system signals.

This information can then be employed in telephone applications (simple or complex) to control telephone operations. The data output will require a suitable software format to analyze the frequency information from the FX623.

Requiring only a single 3.0_[MIN] volt power supply, the FX623 may be line-powered and will operate under simple logic or system Processor control using the 'Data-Change, 'Hold' and 'Chip-Select' functions.

The FX623, whose small size and low power consumption makes it ideal for remote applications,requires a 3.579545MHz telephone system clock or Xtal input, is available in a 16-pin plastic DIL package.