Hot-selling and scarce MTC-20278PQ-I ISDN Controller QFP80 spot stock

Product Descriptions

The MTC-20278/9 chip contains all the functions necessary to make 4 ‘U’ interfaces in an ISDN Line Termination card. It comprises 4, fully integrated echo-canceling ‘U’ interfaces, conformant to the ‘Uk0’ interface point, plus the necessary support and test functions. The general block diagram is shown in Figure 1. Two versions of the device are available - the MTC-20278 offering the 2B1Q line code, and the MTC-20279 which has 4B3T line coding. Both devices are pin compatible, and are fully compliant with the relevant parts of ETSI, FTZ and ITU requirements for ISDN connection.

The MTC-20278/9 devices offer a user transport rate of 144kbit/s full duplex (2B + D) per channel, as well as fully automatic control of activate/deactivate protocols and line supply, and full support of the maintenance channel.

The MTC-20278 offers facilities required for the synchronisation of DECT base stations (“heart beat” and loop length estimation)

The digital interface on the ‘exchange’ side uses the industry-standard GCI interface in 2 Mbit burst mode. This mode allows for 8 channels to be multiplexed onto the same interface. The MTC-20278/9 can be set to respond to either the first 4 or the last 4 timeslots in the GCI frame. This allows two devices, totalling 8 ISDN lines, to be multiplexed onto the same GCI interface.

The MTC-20278/9 takes all timing information from the GCI clocks, and so does not require a separate clock oscillator.

Product Features

▼ Quad ISDN LT ‘U’ interface functions in a single monolithic integrated circuit

▼ Pin compatible 2B1Q and 4B3T line code versions

* MTC-20278 ILTQ for 2B1Q

* MTC-20279 ILTT for 4B3T

▼ Full compliance with theapplicable ETSI, ITU and FTZ requirements

▼ DECT support (2B1Q)

▼ Digital interface bus using industry-standard GCI

▼ Minimal external components

▼ 3.3V operating voltage for low power operation

▼ Advanced 0.5µ CMOS mixed analog/digital process technol ogy

▼ 80 pin Plastic Quad Flat Pack package

Product Photos

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