Silicon Laboratories (SLAB)

Explanatory Note

This Amendment No. 1 to the Current Report on Form 8-K filed by Silicon Laboratories Inc. on February 4, 2009 (the "Original Report") is being filed solely for the purpose of correcting a typographical error that appears on page 5 of exhibit 99 of the Original Report.  For the three months ended January 3, 2009, cost of revenues was $39,252,000, rather than $33,252,000 as reported in our Original Report. 

EXPLANATORY NOTE

This Amendment No. 1 to the Annual Report on Form 10-K of Silicon Laboratories Inc. for the fiscal year ended December 31, 2005 is being filed in order to classify our investments in variable-rate demand notes as short-term investments rather than cash and cash equivalents on our consolidated balance sheet at December 31, 2005 included in our Annual Report on Form 10-K filed on February 9, 2006 (the “Original Report”). We have also made corresponding adjustments to the consolidated statement of cash flows for the fiscal year ended December 31, 2005. The reclassifications had no impact on our consolidated statements of income or stockholders’ equity. See RECLASSIFICATIONS in Note 2 of the Notes to Consolidated Financial Statements included in this Form 10-K/A for additional information. References herein to the Form 10-K refer to our Original Report, as amended by this Amendment No. 1.

Except for matters related to the aforementioned reclassification, this Amendment No.1 does not modify or update other disclosures in the Original Report, including the nature and character of such disclosure to reflect events occurring after the filing date of the Original Report. While we are amending only certain portions of our Form 10-K, for convenience and ease of reference, we are filing the entire Form 10-K, except for certain exhibits. Accordingly, this Form 10-K/A should be read in conjunction with our filings made with the Securities and Exchange Commission.