Zero Delay Buffers operate at speeds to 175 MHz.

Press Release Summary:

Designed for use with SDRAM modules, clock driver Models XRK32510 and XRK39910 accurately align feedback output to clock input signal ensuring zero delay through IC. Each device distributes 1 clock input to bank of 10 outputs, resulting in low-skew, low-jitter copies of each clock. Model XRK39910 offers 8 zero delay outputs with less than 250 ps of output-to-output skew, selectable positive or negative edge synchronization, and jitter of less than 200 ps peak-to peak.

Original Press Release:

Exar Expands Clock Portfolio with Industry-Standard, High-Performance, Low-Skew Zero Delay Buffer Family

FREMONT, California, September 26, 2005 - Exar Corporation (Nasdaq: EXAR), a leading provider of high-performance, mixed-signal silicon solutions for the worldwide communications infrastructure expanded its clock and timing solution portfolio with a family of zero delay buffers. Unveiled today were the family's first two devices that minimize external components to reduce board space and cost. Both products deliver low-skew and low-noise capabilities at 3.3V operation. The XRK32510 and XRK39910 are cost-effective zero delay buffers for a wide range of applications spanning from consumer and industrial to networking and computing.

"This marks Exar's fourth clock and timing introduction and reaffirms Exar's focus on not only this market but the Company's ongoing commitment to delivering customers a wide range of device options," said Bahram Ghaderi, vice president and general manager, Network and Transmission Products Division. "Leveraging our extensive analog and Phase Lock Loop (PLL) design expertise, we have extended this product line to include more features and functionality for customers' clock distribution needs. Exar previously introduced Intelligent Dynamic Clock Switch (IDCS) devices and a portfolio of 3.3V Programmable Skew Buffer (PSB) each offering customers an extensive array of design options."

Product Highlights
Operating at speeds up to 175 MHz, the zero delay buffer clock driver family is designed for use with synchronous dynamic random access memory modules found in computing systems, plus telecommunications and networking applications. The devices accurately align the feedback output to the clock input signal ensuring a zero delay through the IC. Each device distributes one clock input to a bank of ten outputs, resulting in low-skew, low-jitter copies of each clock. The family offers tight peak-to-peak jitter spec at less than 75 pico seconds to ensure the production of stable and clean signals.

The XRK39910 is a fanout phase locked-loop clock driver intended for high performance computing and data-communications applications. The internal loop filter is tuned to minimize the jitter (or frequency variation) while still providing accurate responses to input frequency changes. The XRK39910 offers eight zero delay outputs with less than 250ps of output-to-output skew, selectable positive or negative edge synchronization, output frequency of 15MHz to 85MHz, and low jitter of less than 200ps peak-to peak.

"The XRK32510 and XRK39910 are ideal for a broad range of applications in a wide array of markets," said Sergis Mushell, senior marketing manager, Clock and Timing products. "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 XRK32510 in a 24-pin TSSOP package is $2.20 for 10,000 unit quantities and available now. Additional information on this product can be found at The XRK39910 in a 24-pin SOIC package is $1.95, based on 10,000 unit quantities and will be available in 30 days. Additional information on this product can be found at and other Exar Clock and Timing solution products at

About Exar
Exar Corporation, celebrating its 20th year on Nasdaq, designs, develops and markets high-performance, 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 provides OEMs innovative, highly integrated ICs that facilitate the transport and aggregation 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 275 people worldwide. For more information about the Company visit:

For Immediate Release
Greg Kaufman, Marketing Communications
(510) 668-7000

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