Exar Adds Innovative 16-channel T1/E1/J1 Line Interface Unit (LIU) to Industry's Most Extensive T/E Portfolio

Device Provides Up to 40% Board Space Savings When Compared to Offerings with Same Port Count Capabilities

Fremont, California, July 9, 2007 -- Exar Corporation, a leading provider of high-performance, mixed-signal silicon solutions for the worldwide communications infrastructure added to its already extensive portfolio of T/E product solutions a 16-channel T1/E1/J1 LIU. The XRT83VSH316 is optimized for high-density applications where board space is a premium such as multi-service provisioning platforms, routers, optical, and wireless transport equipment.

"Responding to market requirements for a feature-rich, high-density 16-channel T1/E1/J1 LIU in a very small package -- (21mm x 21mm), Exar has extended its lead over the competition with the XRT83VSH316," said John Demiray director of marketing, Network and Transmission Products. "The XRT83VSH316 is the ideal solution for emerging high-density applications where board space is limited such as circuit emulation and voice-over-IP, as well as existing transport applications."

Key Product Features

The XRT83VSH316 supports a single bill of materials for T1/E1/J1 applications, and has selectable RX and TX internal terminations (T1/E1/J1) for 75/120(ohm), 100(ohm) and 110(ohm) lines. In addition, it has a master clock timing generator where only a single T1, E1, or 8 kHz clock is needed. Also, it has relay-less board hot swapping which reduces system downtime during routine maintenance.

In this new generation of the LIU's, Exar introduced additional features to the 16-channel LIU including system side RLOS, AIS, QRSS/PRBS generation/detection, line side RLOS, AIS, QRSS/PRBS generation/detection, DMO with 16-bit LCV counters, and diagnostic loop back modes for each channel.

The XRT83VSH316 supports Exar's R(3) Technology(TM) -- introduced in 2002. Devices using R(3) Technology are reconfigurable with integrated termination supporting all common T1/E1/J1 line impedances enabling customers to build a simple board and eliminate the need for external relays for 1:1 and 1+1 redundancy applications. This feature allows final device configuration to be made just prior to line-card installation. This unique capability prevents customers from having to unnecessarily stockpile an inventory of all configurations to accommodate changing market conditions.

Product Details

The XRT83VSH316, on a per-channel basis, has power down mode with independent receive and transmit selection, user programmable arbitrary pulse mode, and an on-chip transmit short circuit protection which prevents line drivers from damage. In addition, the device also has a selectable crystal-less digital jitter attenuator with 32-bit or 64-bit FIFO for both the receive and transmit data path.

T/E Portfolio Overview

Exar's T/E portfolio encompasses the broadest selection of physical-layer devices supporting the widest variety of rates, functions and granularities. Devices include T1/E1 Analog Front Ends (AFEs), short-haul and long-haul LIUs, and LIU and framer combinations. In addition, there is a diversified range of T3/E3 solutions including single/multi-channel physical interface devices: receivers, transmitters, transceivers, framers, LIUs, jitter attenuators, plus integrated LIU jitter attenuators/framers offering customers increased design flexibility. All the T/E devices are highly integrated and possess advanced features and functionality.

Prices, Packages, Availability and Additional Information

Samples of the XRT83VSH316 are available now in a 316 Ball BGA package and operate at 3.3V/1.8V with 5V tolerant I/Os over the industrial temperature range.