The CMX612 is a low power CMOS device used for the reception of physical layer signals in Bellcore's Calling Identity Delivery system (CID), British Telecom's Calling Line Identification Service (CLIP), the Cable Communications Association's Caller Display Services (CDS), and similar evolving systems. This device also meets the requirements of emerging Caller Identity with Call Waiting Services (CIDCW). Visual Message Waiting Indicator (VMWI) detection in both CLASS (FSK) and (SDT) Stuttered Dial Tone modes is provided by the CMX612. In addition, two different signal inputs are available to support Tip/Ring and Hybrid connectivity. This device includes a `zero-power' ring or line reversal detector, two dual-tone detectors and a 1200-baud FSK Bell 202/V.23 compatible asynchronous data demodulator. The dual-tone detectors are the Tone Alert Signal (2130Hz plus 2750Hz) detector and the stuttered dial tone (350Hz plus 440Hz) detector. The 1200-baud FSK Bell 202/V.23 compatible asynchronous data demodulator with data retiming circuitry removes the need for a UART in the associated PC. The CMX612 is suitable for use in systems using Bellcore specifications GR-30-CORE and SR-TSV-002476, British Telecom specifications SIN227 and SIN242, CCA TW/P&E/312, ETSI ETS 300 659 parts 1 and 2, ETS 300 778 parts 1 and 2, and Mercury Communications MNR 19. This device may be used with a 2.7V to 5.5V power supply and is available in the following packages: 20-pin TSSOP (CMX612E3) or 22-pin PDIP (CMX612P6). 1999 MX-COM, Inc.