MT88E45B

• Compatible with:
• Bellcore GR-30-CORE, SR-TSV-002476, ANSI/TIA/EIA-716, TIA/EIA-777;
• ETSI ETS 300 778-1 (FSK only variant) & -2;
• BT (British Telecom) SIN227 & SIN242
• Bellcore 'CPE Alerting Signal' (CAS), ETSI 'Dual Tone Alerting Signal' (DT-AS), BT Idle State and Loop State 'Tone Alert Signal' detection
• 1200 baud Bell 202 and CCITT V.23 FSK demodulation
• Separate differential input amplifiers with adjustable gain for Tip/Ring and telephone  hybrid or speech IC connections
• Selectable 3-wire FSK data interface (bit stream or 1 byte buffer)
• Facility to monitor the stop bit for framing error check
• FSK Carrier detect status output
• 3 to 5V +/- 10% supply voltage
• Uses 3.579545MHz crystal or ceramic resonator
• Low power CMOS with power down

• Bellcore CID (Calling Identity Delivery) and CIDCW (Calling Identity Delivery on Call Waiting) telephones and adjuncts
• ETSI, BT CLIP (Calling Line Identity Presentation) and CLIP with Call Waitingtelephones and adjuncts
• Fax and answering machines
• Computer Telephony Integration (CTI) systems

The MT88E45B is a low power CMOS integrated circuit suitable for receiving the physical layer signals used in North American (Bellcore) Calling Identity Delivery on Call Waiting (CIDCW) and Calling Identity Delivery (CID) services. It is also suitable for ETSI and BT Calling Line Identity Presentation (CLIP) and CLIP with Call Waiting services. The MT88E45B contains a 1200 baud Bell 202/ CCITT V.23 FSK demodulator and a CAS/DT-AS detector. Two input op-amps allow the MT88E45B to be connected to both Tip/Ring and the telephone hybrid or speech IC receive pair for optimal CIDCW telephone architectural implementation. FSK demodulation is always on Tip/Ring, while CAS detection can be on Tip/Ring or Hybrid Receive. Tip/ Ring CAS detection is required for the Bellcore/TIA Multiple Extension Interworking (MEI) and BT's onhook CLIP. A selectable FSK data interface allows the data to be processed as a bit stream or extracted from a 1 byte on chip buffer. Power management has been incorporated to power down the FSK or CAS section when not required. Full chip power down is also available. The MT88E45B is suitable for applications using a fixed power source (with a +/- 10% variation) between 3 and 5V.