GENERAL DESCRIPTION
The Winbond Caller Identification device W91031, is a low power CMOS integrated circuit used to receive physical layer signals transmitted according to Bellcore and British Telecom (BT) specifications. There are two types of Caller Identifications, the first type is on-hook calling with caller ID message and the second type is call on waiting. The W91031 device provides all the features and functions of the Caller Identification specification for both these types, including FSK demodulation, Tone Alert Signal detection and ring detection.

FEATURES AND APPLICATIONS
Features
• Compatible with Bellcore TR-NWT-000030 & SR-TSV-002476, British Telecom (BT) SIN227, U.K. Cable Communications Association (CCA) specification
• Ring and line reversal detection
• Bellcore CPE Alerting Signal (CAS) and BT idle State and Loop State Tone Alerting Signal detection use dual tone alerting signal detector
• BELL 202 and CCITT V.23 FSK demodulation with 1200 baud rate
• Use 3.579545 MHz crystal or ceramic resonator
• Low power CMOS technology with sleep mode
• High input sensitivity
• Variable gain input amplifier
• FSK carry detect output
• Two modes for 3-wire FSK data interface
• Packaged in 24-pin 0.6 inch (600 mil) plastic DIP and 24-pin 0.3 inch (300 mil) plastic SOP

Applications
• Bellcore Calling Identity Delivery (CID), and BT Calling Line Identity Presentation (CLIP), CCA CLIP systems
• Feature phones
• Phone set adjunct boxes
• FAX and answering machines
• Data base telephone system and Computer Telephony Integration (CTI) systems