MT88E39

The MT88E39 Calling Number Identification Circuit (CNIC1.1) is a CMOS integrated circuit which provides an interface to calling line information delivery services that utilize 1200 baud Bell 202 or CCITT V.23 FSK data transmission schemes. The MT88E39 receives and demodulates the FSK signal and outputs the data into a simple dual mode 3-wire serial interface which eliminates the need for an UART. The MT88E39 is Bellcore, ETSI and NTT compatible and can operate in 3V and 5V applications. It is a pin to pin replacement of the MT8841 and MT88E41 by operating in the MT88E41 FSK interface mode (mode 0) when placed in a MT88E41 socket. New designs may also choose the MT88E43 compatible interface (mode 1) where the microcontroller reads the FSK byte from a 1 byte buffer.