Clock Generators target low-skew applications.

Press Release Summary:



Series XRK6977x PLL-based LVCMOS clock generators generate variety of bank frequency ratios and output-to-input frequency ratios from single clock signal source. Each device uses PLL circuit to frequency lock outputs to input reference clock, divider in feedback path then determines frequency of VCO. In addition, each output bank can individually divide down VCO output frequency. Devices accept crystal oscillator input or 1 of 2 LVCMOS compatible inputs as input reference clock source.



Original Press Release:



Exar Adds Clock Generator Family - One of Few Companies Offering Four Leading Clock Solutions: Zero Delay Buffers (ZDB); Programmable Skew Buffer (PSB)



Four Industry-Standard Devices Target High Performance, Low-Skew
Applications

Fremont, California April 10, 2006 - Exar Corporation (Nasdaq: EXAR), a leading provider of
high-performance, mixed-signal silicon solutions for the worldwide communications infrastructure
added a new family of clock generators to its expanding clock and timing solution portfolio. With
these four new devices -- the XRK6977x Series -- plus ZDB products announced in February
2006, IDCS products announced in September 2004, and the PSB solutions announced in March
2004, Exar becomes one of few companies providing four leading clock and timing capabilities to
customers. Exar's clock product portfolio spans applications from telecommunications,
networking to servers and consumer applications.
"Representing Exar's sixth clock and timing introduction overall, and second clock launch in less
than two months, today's release demonstrates the Company's continuing focus on this growing
market," said Bahram Ghaderi, vice president and general manager, Network and Transmission
Products Division. "Exar has extended its analog Phase Lock Loop (PLL) design expertise to yet
another area identified by customers seeking new solutions to their design challenges."

Product Highlights

This new family of PLL based LVCMOS clock generators includes the XRK69772, XRK69773,
XRK69774 and XRK697H73. The XRK6977x family can generate a multitude of different bank
frequency ratios and output-to-input frequency ratios from a single clock signal source. This is
accomplished by each device using PLL circuit to frequency lock its outputs to the input referenceclock. The divider in the feedback path then determines the frequency of the VCO. In addition,
each of the separate output banks can individually divide down the VCO output frequency.

The XRK6977x family is highly flexible accepting either a crystal oscillator input or one of two
LVCMOS compatible inputs for use as the input reference clock source. The XRK697H73 can
accept either PECL or one of the two LVCMOS inputs. The XRK69772, XRK69773 and
XRK697H73 can select between one of three reference inputs and provide (12) LVCMOS outputs
- (3) banks of (4) for clock distribution, (1) for feedback and (1) for synchronization. The
XRK69774 can select between one of two reference inputs and provide (14) LVCMOS outputs -
(2) banks of (5) and (1) bank of (4) for clock distribution and (1) for feedback. The XRK697H73
adds the higher drive and lower impedance capability to XRK69773. To support clock
redundancy, two LVCMOS inputs are provided where switching the internal reference clock is
controlled by the control input.

"The XRK69772, XRK69773, XRK69774 and XRK697H73 are ideal for a broad range of
applications in a wide array of markets," said John Demiray, director of strategic marketing,
Network and Transmission Products Division. "These products provide an opportunity for Exar to
engage in many designs that require multi-sourced industry-standard devices."

Prices, Packages, Availability, and Additional Information

The XRK69772 in a 52-pin LQFP package is $3.82 for 10,000 unit quantities and available now. Additional
information on this product can be found at www.exar.com/product.php?ProdNumber=XRK69772. The
XRK69773 in a 52-pin LQFP package is $3.82 for 10,000 unit quantities and available now. Additional
information on this product can be found at www.exar.com/product.php?ProdNumber=XRK69773.The
XRK69774 in a 52-pin LQFP package is $3.82 for 10,000 unit quantities and available now. Additional
information on this product can be found at www.exar.com/product.php?ProdNumber=XRK69774. The
XRK697H73 in a 52-pin LQFP package is $3.82 for 10,000 unit quantities and available now. Additional
information on this product can be found at www.exar.com/product.php?ProdNumber=XRK697H73.
In addition, other Exar Clock and Timing solution products can be at
http://www.exar.com/area.php?areaID=11.

About Exar

Exar Corporation, celebrating its 20th year on Nasdaq, designs, develops and markets highperformance,
analog and mixed-signal silicon solutions for the worldwide communications
infrastructure. Leveraging its industry-proven analog design expertise, system-level knowledge
and standard CMOS process technologies, the Company offers OEMs innovative, highly
integrated ICs that facilitate the aggregation and transport of signals in access, metro and wide area
networks. The Company's physical layer silicon solutions address transmission standards such as
T/E carrier, ATM and SONET. The Company also provides one of the industry's most
comprehensive family of serial communications solutions. Within this product offering, the low
voltage and multi-channel universal asynchronous receiver transmitters are particularly well suited
to support high data rate and increasing data transfer efficiency requirements for various industrial,
telecom and computer server applications. In addition, the Company offers a portfolio of clock
generation and clock distribution devices for a wide range of communications systems. The Company is based in Fremont, CA, had fiscal 2005 revenues of $57.4 million, and employs
approximately 260 people worldwide. For more information about the Company visit:
http://www.exar.com.

Contacts:
Greg Kaufman, Marketing Communications
(510) 668-7000

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