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                       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

                                December 20, 2006
                Date of Report (Date of earliest event reported)


                                PMC-SIERRA, INC.
             (Exact name of Registrant as specified in its charter)

        Delaware                       0-19084                    94-2925073
(State or other jurisdiction    (Commission File Number)        (IRS Employer
     of incorporation)                                    Identification Number)


                               3975 Freedom Circle
                              Santa Clara, CA 95054
               (Address of Principal Executive Offices) (Zip Code)

                                 (408) 239-8000
              (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:

|_|      Written communications pursuant to Rule 425 under the Securities Act
         (17 CFR 230.425)

|_|      Soliciting material pursuant to Rule 14a-12 under the Exchange Act
         (17 CFR 240.14a-12)

|_|      Pre-commencement communications pursuant to Rule 14d-2(b) under the
         Exchange Act (17 CFR 240.14d-2(b))

|_|      Pre-commencement communications pursuant to Rule 13e-4(c) under the
         Exchange Act (17 CFR 240.13e-4(c))

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ITEM 2.02.      Results of Operations and Financial Condition

On December 20, 2006, PMC-Sierra, Inc. (the "Registrant") issued a press release
announcing that it has provided an update to its business outlook for the fourth
quarter ending December 31, 2006. The press release is attached hereto as
Exhibit 99.1.

The information in this Form 8-K and the Exhibit, attached hereto, shall not be
deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act
of 1934, as amended (the "Exchange Act"), or otherwise subject to the
liabilities of that section, nor shall it be deemed incorporated by reference in
any filing under the Securities Act of 1933, as amended, or the Exchange Act,
regardless of any general incorporation language in such filing.



ITEM 9.01.      Financial Statements and Exhibits

        (c)     Exhibits.

                99.1    Press release of PMC-Sierra, Inc. dated December 20,
                        2006 (furnished and not filed herewith solely pursuant
                        to Item 2.02).



                                    SIGNATURE

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.



                                        PMC-SIERRA, INC.
                                        (Registrant)


Date: December 20, 2006                     By: /s/ Alan F. Krock
      -----------------                         --------------------------------
                                                Alan F. Krock
                                                Vice President
                                                Chief Financial Officer and
                                                Principal Accounting Officer


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                                  EXHIBIT INDEX

Exhibit
Number          Description
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99.1            Press release of PMC-Sierra, Inc. dated December 20, 2006.


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