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

                                 Low Power



    FREMONT, Calif., Aug. 11 /EMWNews/ -- 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

http://www.exar.com/Common/Content/ProductDetails.aspx?ID=XRT91L33.

Information on all of Exar's SONET/SDH products can be found at

http://www.exar.com/Common/Content/Product.aspx?Parent=3&ID=456&SubID=34.

    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:

http://www.exar.com.