Features: • MX•COM MiXed Signal CMOS
• Custom Tone Decoder (13 Call-Progress Frequencies Recognized)
• Operates to a 3.579545MHz Telephone System Clock
• Operates Under Simple Logic or µProcessor System Control
• Measures Call Progress Tone Frequencies ('Busy', 'Dial', 'Fax-Tone' etc.)
• Telephone, PABX, Fax and Dial-Up Modem Applications
• Low-Power Requirement (600µA at 3.3 VoltsTYP) for Line-Powered ApplicationsSpecificationsExceeding the maximum rating can result in device damage. Operation of the device outside the operating limits is not implied.
Supply voltage............................................ -0.3 to 7.0V
Input voltage at any pin
(ref VSS = 0V).................................. -0.3 to (VDD + 0.3V)
Sink/source current
(supply pins).................................................... +/- 30mA
(other pins)...................................................... +/- 20mA
Total device dissipation
@ TAMB 25................................................ 800mW Max.
Derating ............................................................10mW/
Storage temperature range...................... -40 to +85DescriptionThe MX623 is a low-power decoding integrated circuit that measures the frequency of telephone system call progress tones.
With progress signals input from the telephone line, this 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 MX623, the host system, can recognize such call progress information as: 'Dial', Busy', 'Number Unobtainable', 'Ringing' and Fax/Modem system signals.
This information can then be used in simple or complex applications to control telephone operations. The data output will require a software format that can analyze the frequency information from the MX623.
Requiring only a single 3.0[MIN] volt power supply, the MX623 may be line-powered and will operate under simple logic or system mProcessor control using the 'Data-Change, 'Hold' and 'Chip-Select' functions.
The MX623, 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 PDIP.
MX623 Data Sheet
