Recovery device upgrades to OC-3 and OC-12

An Exar product story

Edited by the Electronicstalk editorial team Aug 12, 2008

Single-channel device is footprint compatible with competing Sonet/SDH CDR products enabling system architects to easily migrate from existing designs.

Exar has launched a Sonet/SDH OC-3/-12 clock and data recovery (CDR) device for industry standard optical and backplane applications.

The XRT91L33 is ideal for the cost-reduction trend and increased design margin needs on new and legacy line card designs in add-drop multiplexers, crossconnect equipment and multiservice switches and routers.

"This single-channel device is footprint compatible with competing Sonet/SDH CDR products enabling system architects to easily migrate from existing designs to XRT91L33-based platforms that immediately deliver significant performance improvements", said Darren Pool, Senior Product Line Manager, Communications Product Line.

The XRT91L33 adds to the existing highly successful family of Sonet/SDH transceiver products: the XRT91L31, XRT91L32, XRT91L80 and XRT91L82 operating at OC-3, OC-12 and OC-48 rates as well the quad CDR device (XRT91L34) introduced in 2007 for OC-3 and OC-12 applications.

"Exar's PLL and CDR technology implemented in standard CMOS process provides best-in-class jitter performance (typically greater than 0.5UI jitter tolerance) and offers an optimised power, performance, and price solution in the marketplace", said Raj Paripatyadar, Applications Manager Communications Product Line.

Using the underlying technology footprint from Exar's successful XRT91L34 quad CDR device, the XRT91L33 is a single channel device operating at 155/622Mbit/s Sonet/SDH datarates.

This device features very low power dissipation in a small footprint 20-pin TSSOP package.

The XRT91L33 can generate all clocks from a low cost 19MHz crystal oscillator.

In addition, this device is able to detect and generate various alarms and status outputs to provide immediate system alerts and complete fault coverage.

The device incorporates on chip power regulation to provide superior noise and crosstalk immunity to improve the performance that is critical to Sonet/SDH applications.

The XRT91L33 is available now.

In 1000-piece quantities, in a 20-pin TSSOP package, the XRT91L33 is priced at around US $7.50 each.

The XRT91L33 requires 3.3V power supply and operates over the industrial temperature range.