SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Tuttle George Tyson (Last) (First) (Middle) 400 WEST CESAR CHAVEZ (Street) AUSTIN TX 78701 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 05/12/2011	3. Issuer Name and Ticker or Trading Symbol SILICON LABORATORIES INC [ SLAB ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) COO	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock, $0.0001 par value	60,347(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Non-Qualified Stock Option (right to buy)	02/15/2008(2)	02/15/2017	Common Stock, $0.0001 par value	13,000	$32.11	D
Non-Qualified Stock Option (right to buy)	02/15/2009(3)	02/15/2018	Common Stock, $0.0001 par value	11,511	$31.96	D

Explanation of Responses:

1. Includes 43,795 restricted stock units (RSUs) that will entitle Reporting Person to receive one share of common stock per RSU. 13,911 RSUs will vest on February 15, 2012 and will be settled pursuant to the terms of the Issuer's 2000 Stock Incentive Plan. 7,169 RSUs will vest on February 15, 2012, 14,339 RSUs will vest on February 15, 2013, and 8,376 RSUs will vest on February 15, 2014 and will be settled pursuant to the terms of the Issuer's 2009 Stock Incentive Plan.

2. Originally granted 30,000 option shares. Option vests and becomes exercisable with respect to (i) twenty percent (20%) of the total granted option shares on the date exercisable and (ii) the balance of the total granted option shares in a series of forty-eight (48) successive monthly installments over the forty-eight (48) month period measured from the date exercisable.

3. Originally granted 21,250 option shares. Option vests and becomes exercisable with respect to (i) twenty-five percent (25%) of the total granted option shares on the date exercisable and (ii) the balance of the total granted option shares in a series of thirty-six (36) successive monthly installments over the thirty-six (36) month period measured from the date exercisable.

	George Tyson Tuttle	05/16/2011
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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