Clock and Data Recovery Device suits SONET/SDH applications.

Press Release Summary:

Housed in 20-pin TSSOP package, Model XRT91L33 operates at 166/622 Mbps SONET/SDH data rates. Single-channel OC-3/-12 Clock and Data Recovery Device can generate all clocks from 19 MHz crystal oscillator, as well as detect and generate various alarms and status outputs to provide immediate alerts and complete fault coverage. On-chip power regulation provides noise and crosstalk immunity to optimize performance that is critical to SONET/SDH applications.

Original Press Release:

Exar Adds SONET/SDH Clock and Data Recovery (CDR) OC-3/OC-12 Solution

Drop-In-Replacement Device Delivers Best-In-Class Jitter Performance and Low Power

FREMONT, Calif., Aug. 11 / -- Exar Corporation (NASDAQ:EXAR) 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, 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.

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 optimized power, performance, and price solution in the marketplace," said Raj Paripatyadar, applications manager Communications Product Line.

Product Features

Utilizing the underlying technology footprint from Exar's successful XRT91L34 quad CDR device, the XRT91L33 is a single channel solution operating at 155/622 Mbps SONET/SDH data rates. 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.

Prices, Packages, Availability and Additional Information

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 3.3V power supply and operates over the industrial temperature range. Additional information on this device can be found at Information on all of Exar's SONET/SDH products can be found at

About Exar

Exar Corporation is Powering Connectivity by delivering highly differentiated silicon solutions empowering products to connect. With distinctive knowledge in analog and digital technologies, Exar enables a wide array of applications such as portable devices, home media gateways, communications systems, and industrial automation equipment. Exar has locations worldwide providing real-time system-level support to drive rapid product innovation. For more information about Exar visit:

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