UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

July 6, 2012

Date of report (Date of earliest event reported)

Integrated Device Technology, Inc.

(Exact name of registrant as specified in its charter)

6024 Silver Creek Valley Road, San Jose, California 95138

(Address of principal executive offices) (Zip Code)

(408) 284-8200

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Item 8.01 Other Events.

On May 7, 2012, in connection with the previously announced merger agreement with PLX Technology, Inc. (“PLX”), dated April 30, 2012, which contemplates the exchange offer for all outstanding shares of PLX common stock, followed by a second step merger, Integrated Device Technology, Inc. (“IDT”) and PLX made premerger filings under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (the “HSR Act”) with the Federal Trade Commission (“FTC”) and the Antitrust Division of the U.S. Department of Justice. As previously reported, effective June 5, 2012, following consultation with the FTC and PLX, IDT voluntarily withdrew its Notification and Report Form with respect to the exchange offer and the merger. IDT re-filed its Notification and Report form on June 6, 2012.

On July 6, 2012, IDT and PLX each received a request for additional information from the FTC (the “Second Request”). This Second Request extends the waiting period applicable to the exchange offer under the HSR Act, which was set to expire on July 6, 2012 at 11:59 p.m., New York City time. The waiting period is extended until 11:59 p.m., New York City time, on the thirtieth day (or the next business day) after both IDT and PLX substantially comply with the Second Request, as specified by the HSR Act and the implementing rules.

Additional Information

These materials are for informational purposes only and shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. Any offer with respect to the acquisition of PLX Technology will only be made through the prospectus, which is part of the registration statement on Form S-4, which contains an offer to purchase, form of letter of transmittal and other documents relating to the exchange offer, as well as the Tender Offer Statement on Schedule TO, (collectively, and as amended and supplemented from time to time, the “Exchange Offer Materials”), each initially filed with the U.S. Securities and Exchange Commission (the “SEC”) by IDT on May 22, 2012. The registration statement has not yet become effective. In addition, PLX Technology filed with the SEC on May 22, 2012 a solicitation/recommendation statement on Schedule 14D-9 (as amended and supplemented from time to time, the “Schedule 14D-9”) with respect to the exchange offer. Investors and security holders are urged to carefully read these documents and the other documents relating to the transactions because these documents contain important information relating to the exchange offer and related transactions. Investors and security holders may obtain a free copy of these documents, as filed with the SEC, and other annual, quarterly and special reports and other information filed with the SEC by IDT or PLX Technology, at the SEC’s website at www.sec.gov. In addition, such materials will be available from IDT or PLX Technology, or by calling Innisfree M&A Incorporated, the information agent for the exchange offer, toll-free at (877) 456-3463 (banks and brokers may call collect at (212) 750-5833).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.