Starboard Value SC 13D/A Integrated Device Technology Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

(Amendment No. 4)1

Integrated Device Technology, Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

458118106

(CUSIP Number)

JEFFREY C. SMITH

STARBOARD VALUE LP

830 Third Avenue, 3rd Floor

New York, New York 10022

(212) 845-7977

STEVE WOLOSKY, ESQ.

OLSHAN FROME WOLOSKY LLP

Park Avenue Tower

65 East 55th Street

New York, New York 10022

(212) 451-2300

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

January 16, 2014

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ¨.

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See § 240.13d-7 for other parties to whom copies are to be sent.

_______________

1 The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD VALUE LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 10,202,809
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 10,202,809
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,202,809
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.7%
14	TYPE OF REPORTING PERSON PN

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION CAYMAN ISLANDS
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 6,205,939
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 6,205,939
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,205,939
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.1%
14	TYPE OF REPORTING PERSON CO

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY S LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 1,557,336
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 1,557,336
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,557,336
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.0%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD VALUE GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 10,202,809
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 10,202,809
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,202,809
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.7%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD PRINCIPAL CO LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 10,202,809
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 10,202,809
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,202,809
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.7%
14	TYPE OF REPORTING PERSON PN

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD PRINCIPAL CO GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 10,202,809
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 10,202,809
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,202,809
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.7%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON JEFFREY C. SMITH
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 10,202,809
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 10,202,809
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,202,809
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.7%
14	TYPE OF REPORTING PERSON IN

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON MARK R. MITCHELL
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 10,202,809
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 10,202,809
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,202,809
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.7%
14	TYPE OF REPORTING PERSON IN

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON PETER A. FELD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 35,834
	8	SHARED VOTING POWER 10,202,809
	9	SOLE DISPOSITIVE POWER 35,834
	10	SHARED DISPOSITIVE POWER 10,202,809
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,238,643
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.8%
14	TYPE OF REPORTING PERSON IN

CUSIP NO. 458118106

The following constitutes Amendment No. 4 to the Schedule 13D filed by the undersigned (“Amendment No. 4”). This Amendment No. 4 amends the Schedule 13D as specifically set forth herein.

Item 3.

Source and Amount of Funds or Other Consideration.

Item 3 is hereby amended and restated to read as follows:

The Shares purchased by each of Starboard V&O Fund and Starboard S LLC and held in the Starboard Value LP Account were purchased with working capital (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business) in open market purchases. The aggregate purchase price of the 6,205,939 Shares beneficially owned by Starboard V&O Fund is approximately $39,167,030, excluding brokerage commissions. The aggregate purchase price of the 1,557,336 Shares beneficially owned by Starboard S LLC is approximately $10,075,883, excluding brokerage commissions. The aggregate purchase price of the 2,439,534 Shares held in the Starboard Value LP Account is approximately $15,795,267, excluding brokerage commissions.

The 35,834 Shares owned personally by Peter A. Feld represent (i) 8,834 vested restricted stock units (RSUs) and (ii) 27,000 Shares underlying certain options exercisable within 60 days that were granted to Mr. Feld as compensation for his service on the Board of Directors of the Issuer.

Item 5.

Interest in Securities of the Issuer.

Items 5(a)-(c) are hereby amended and restated to read as follows:

The aggregate percentage of Shares reported owned by each person named herein is based upon 151,532,718 Shares outstanding, as of November 1, 2013, which is the total number of Shares outstanding as reported in the Issuer’s Quarterly Report on Form 10-Q, filed with the Securities and Exchange Commission on November 6, 2013.

A.	Starboard V&O Fund

(a)

As of the close of business on January 20, 2014, Starboard V&O Fund beneficially owned 6,205,939 Shares.

Percentage: Approximately 4.1%

(b)

1. Sole power to vote or direct vote: 6,205,939

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 6,205,939

4. Shared power to dispose or direct the disposition: 0

(c)

The transactions in the Shares by Starboard V&O Fund during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

B.	Starboard S LLC

(a)

As of the close of business on January 20, 2014, Starboard S LLC beneficially owned 1,557,336 Shares.

Percentage: Approximately 1.0%

CUSIP NO. 458118106

(b)

1. Sole power to vote or direct vote: 1,557,336

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 1,557,336

4. Shared power to dispose or direct the disposition: 0

(c)

The transactions in the Shares by Starboard S LLC Fund during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

C.	Starboard Value LP

(a)

As of the close of business on January 20, 2014, 2,439,534 Shares were held in the Starboard Value LP Account. Starboard Value LP, as the investment manager of Starboard V&O Fund and the Starboard Value LP Account and the manager of Starboard S LLC, may be deemed the beneficial owner of the (i) 6,205,939 Shares owned by Starboard V&O Fund, (ii) 1,557,336 Shares owned by Starboard S LLC and (iii) 2,439,534 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.7%

(b)

1. Sole power to vote or direct vote: 10,202,809

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 10,202,809

4. Shared power to dispose or direct the disposition: 0

(c)

The transactions in the Shares by Starboard Value LP through the Starboard Value LP Account and on behalf of each of Starboard V&O Fund and Starboard S LLC during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

D.	Starboard Value GP

(a)

Starboard Value GP, as the general partner of Starboard Value LP, may be deemed the beneficial owner of the (i) 6,205,939 Shares owned by Starboard V&O Fund, (ii) 1,557,336 Shares owned by Starboard S LLC and (iii) 2,439,534 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.7%

(b)

1. Sole power to vote or direct vote: 10,202,809

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 10,202,809

4. Shared power to dispose or direct the disposition: 0

(c)

Starboard Value GP has not entered into any transactions in the Shares during the past sixty days. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC and through the Starboard Value LP Account during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

CUSIP NO. 458118106

E.	Principal Co

(a)

Principal Co, as a member of Starboard Value GP, may be deemed the beneficial owner of the (i) 6,205,939 Shares owned by Starboard V&O Fund, (ii) 1,557,336 Shares owned by Starboard S LLC and (iii) 2,439,534 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.7%

(b)

1. Sole power to vote or direct vote: 10,202,809

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 10,202,809

4. Shared power to dispose or direct the disposition: 0

(c)

Principal Co has not entered into any transactions in the Shares during the past sixty days. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC and through the Starboard Value LP Account during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

F.	Principal GP

(a)

Principal GP, as the general partner of Principal Co, may be deemed the beneficial owner of the (i) 6,205,939 Shares owned by Starboard V&O Fund, (ii) 1,557,336 Shares owned by Starboard S LLC and (iii) 2,439,534 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.7%

(b)

1. Sole power to vote or direct vote: 10,202,809

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 10,202,809

4. Shared power to dispose or direct the disposition: 0

(c)

Principal GP has not entered into any transactions in the Shares during the past sixty days. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC and through the Starboard Value LP Account during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

G.	Messrs. Smith and Mitchell

(a)

Each of Messrs. Smith and Mitchell, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP, may be deemed the beneficial owner of the (i) 6,205,939 Shares owned by Starboard V&O Fund, (ii) 1,557,336 Shares owned by Starboard S LLC and (iii) 2,439,534 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.7%

(b)

1. Sole power to vote or direct vote: 0

2. Shared power to vote or direct vote: 10,202,809

3. Sole power to dispose or direct the disposition: 0

4. Shared power to dispose or direct the disposition: 10,202,809

(c)

None of Messrs. Smith or Mitchell has entered into any transactions in the Shares during the past sixty days. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC and through the Starboard Value LP Account during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

CUSIP NO. 458118106

Mr. Feld

(a)

As of the close of business on January 20, 2014, Mr. Feld beneficially owned (i) 8,834 vested RSUs and (ii) 27,000 Shares underlying certain options exercisable within 60 days. Mr. Feld, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP, may be deemed the beneficial owner of the (i) 6,205,939 Shares owned by Starboard V&O Fund, (ii) 1,557,336 Shares owned by Starboard S LLC and (iii) 2,439,534 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.8%

(b)

1. Sole power to vote or direct vote: 35,834

2. Shared power to vote or direct vote: 10,202,809

3. Sole power to dispose or direct the disposition: 35,834

4. Shared power to dispose or direct the disposition: 10,202,809

(c)

Mr. Feld has not entered into any transactions in the Shares during the past sixty days. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC and through the Starboard Value LP Account during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

CUSIP NO. 458118106

SIGNATURES

After reasonable inquiry and to the best of his knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: January 21, 2014

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD

By: Starboard Value LP,

its investment manager

STARBOARD VALUE AND OPPORTUNITY S LLC

By: Starboard Value LP,

its manager

STARBOARD VALUE LP

By: Starboard Value GP LLC,

its general partner

STARBOARD VALUE GP LLC

By: Starboard Principal Co LP,

its member

STARBOARD PRINCIPAL CO LP

By: Starboard Principal Co GP LLC,

its general partner

STARBOARD PRINCIPAL CO GP LLC



By:	/s/ Jeffrey C. Smith
	Name:	Jeffrey C. Smith
	Title:	Authorized Signatory

/s/ Jeffrey C. Smith

JEFFREY C. SMITH

Individually and as attorney-in-fact for Mark R. Mitchell and Peter A. Feld

CUSIP NO. 458118106

SCHEDULE A

Transactions in the Shares During the Past Sixty Days

Shares of Common Stock

Purchased/(Sold)

Price Per

Share($)

Date of

Purchase/Sale

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD

(126,505)	10.1231	12/30/2013
(133,087)	10.1852	12/31/2013
(167,636)	10.6183	01/15/2014
(217,300)	10.5747	01/16/2014
(425,111)	11.0209	01/17/2014

STARBOARD VALUE AND OPPORTUNITY S LLC

(31,746)	10.1231	12/30/2013
(33,397)	10.1852	12/31/2013
(42,067)	10.6183	01/15/2014
(54,530)	10.5747	01/16/2014
(106,678)	11.0209	01/17/2014

STARBOARD VALUE LP

(Through the Starboard Value LP Account)

(49,729)	10.1231	12/30/2013
(52,316)	10.1852	12/31/2013
(65,897)	10.6183	01/15/2014
(85,419)	10.5747	01/16/2014
(167,110)	11.0209	01/17/2014

Starboard Value SC 13D/AIntegrated Device Technology Inc