Exar adds SONET/SDH OC-3/OC-12 CDR

AUGUST 12, 2008 -- The XRT91L33 is designed to follow the cost-reduction trend and meet increased design margin needs on new and legacy line card designs in add/drop multiplexers, cross-connect equipment, and multi-service switches and routers.

AUGUST 12, 2008 -- Exar Corp. (search for 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 designed to follow the cost-reduction trend and meet increased design margin needs on new and legacy line card designs in add/drop multiplexers, cross-connect equipment, and multi-service 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.

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

Utilizing the underlying technology footprint from Exar's successful XRT91L34 quad CDR device, the XRT91L33 is a single-channel IC operating at 155/622-Mbit/sec SONET/SDH data rates. This device features very low power dissipation in a small footprint 20-pin TSSOP package.

Exar says the XRT91L33 can generate all clocks from a 19-MHz 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. At 1,000 piece quantities, in a 20-pin TSSOP package, the XRT91L33 is priced at around $7.50 each. The XRT91L33 requires a 3.3-V power supply and operates over the industrial temperature range.

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