The NTE6860 is a MOS subsystem in a 24Lead DIP type plastic package designed to be integrated into a wide range of equipment utilizing serial data communications. The modem provides the necessary modulation, demodulation and supervisory control functions to implement a serial data communications link, over a voice grade channel, utilizing frequency shift keying (FSK) at bit rates up to 600 bps. The NTE6860 can be implemented into a wide range of data handling systems, including stand alone modems, data storage devices, remote data communication terminals and I/O interfaces for minicomputers. Nchannel silicongate technology permits the NTE6860 to operate using a singlevoltage supply and be fully TTL compatible.