The MC145422 has been discontinued. Suggested replacement: MC145423.
The MC145422 and MC145426 UDLTs are high-speed data transceivers
that provide 80 kbps full-duplex data communication over 26 AWG and
larger twisted-pair cable up to two kilometers in distance. Intended
primarily for use in digital subscriber voice/data telephone systems,
these devices can also be used in remote data acquisition and control
systems. These devices utilize a 256 kilobaud modified differential
phase shift keying burst modulation technique for transmission to
minimize RFI/ EMI and crosstalk. Simultaneous power distribution and
duplex data communication can be obtained using a single twisted-pair
These devices are designed for compatibility with existing, as
well as evolving, telephone switching hardware and software
The UDLT chip-set consists of the MC145422 Leader UDLT for use at
the telephone switch linecard and the MC145426 Follower UDLT for use at
the remote digital telset and/or data terminal.
The devices employ CMOS technology in order to take advantage of
their reliable low-power operation and proven capability for complex
analog/digital LSI functions.