MT88E43B

The MT88E43B Calling Number Identification Circuit 2 is a low power CMOS integrated circuit intended for receiving physical layer signals transmitted according to BT (British Telecom) SIN227 & SIN242, the U.K.'s CCA (Cable Communications Association) TW/P&E/312 and Bellcore GR-30-CORE & SR-TSV-002476 specifications. The MT88E43B is suitable for applications using a fixed voltage power source between 3 and 5V±10%. The MT88E43B contains a FSK demodulator and a CAS/Tone Alert Signal detector. The 1200 baud FSK demodulator is compatible with both Bell 202 and CCITT v.23 formats. To facilitate FSK data extraction, a dual mode 3-wire serial data interface is provided.

In one mode data transfer is initiated by the device. In the second mode, the microcontroller initiates the 8-bit data word extraction from the device. The MT88E43B also offers line reversal detection capability for BT's CLIP, ring burst detection for the U.K.'s CCA's CLIP, and ring detection for Bellcore's CID.