AUSTIN, Texas – April 2, 2001 – Cirrus Logic Inc. (NASDAQ:CRUS) today announced that the U.S. Court of Appeals for the Federal Circuit has upheld the 1999 jury verdict against TriTech Microelectronics International Pte Ltd. of Singapore and TriTech Microelectronics International, Inc. of San Jose, Calif. in which the court ruled that TriTech willfully infringed upon several of Cirrus Logic’s Crystal Semiconductor division patents relating to delta-sigma analog-to-digital (A/D) converter technology.

In the decision, the Appellate court affirmed that Tritech infringed the patents, and increased Tritech’s liability for damages to approximately $35 million dollars. Because Tritech filed for bankruptcy in 1999 and entered liquidation, Cirrus Logic expects to recover only a small fraction of the total liability award sometime during the upcoming year.

“Obviously, we are pleased by the courts recognition of our patent status” said David French, president and CEO of Cirrus Logic. “Our portfolio of more than 1000 analog and DSP related patents and patent applications is one of our company’s most important assets. We intend to defend those patents by vigorously asserting this intellectual property against infringing competitors.”

More than 50 of Cirrus Logic’s and its Crystal Semiconductor division patents are related to delta-sigma A/D conversion. Cirrus Logic has now successfully asserted several of the key delta-sigma patents against other semiconductor chip companies.

About Cirrus Logic

Cirrus Logic is a premier supplier of high-performance analog and DSP chip solutions for Internet entertainment electronics. Building on its global market share leadership in audio integrated circuits and its rich mixed-signal patent portfolio, the company targets high-volume audio, storage and communications applications. Cirrus Logic sells its products under the Crystal®, Maverick™, and 3Ci™ brands as well as its own name. Founded in 1984 in Silicon Valley, Cirrus Logic operates from headquarters in Austin, Texas and major sites located in Fremont, California and Broomfield, Colorado as well as offices in Europe, Japan and Asia. More information about Cirrus Logic is available at www.cirrus.com.

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