The CMX602B is a low power CMOS device used for the reception of physical layer signals in Bellcore's Calling Identity Delivery (CID) and Calling Identity on Call Waiting (CIDCW) systems, British Telecom Calling Line Identification Service (CLIP), the Cable Communications Association's Caller Display Services (CDS), and similar evolving services.
This device includes a 'zero-power' ring or line polarity reversal detector, a dual-tone (2130Hz plus 2750Hz) internally timed CPE Alerting Signal (CAS) detector, and a 1200-baud FSK Bell202/V23 compatible asynchronous data demodulator with data retiming circuitry which removes the need for a UART in the associated µC.

FEATUREs
• Automatic CAS Dual Tone Detector
   High Sensitivity, Low Falsing
   Automatic CAS Duration Checking
• 1µA max. 'Zero-Power' Ring or Line Polarity Reversal Detector
• V23/Bell202 FSK Demodulator with Data Retiming facility
• µC Interrupt / Wake-up output to minimize system operating power
• Low Power Operation 0.5mA at 2.7VDD

APPLICATIONs
• Caller ID/Caller ID on Call Waiting
   Telephones
   Adjunct Boxes
• Bellcore, ETSI, British Telecom, and Mercury Systems
• Computer Telephone Integration
• Call Logging Systems
• Voice Mail Equipment