Exhibit 99.1

FOR IMMEDIATE RELEASE

Financial Contact: Mike Knapp IDT Investor Relations Phone: (408) 284-6515 E-mail: mike.knapp@idt.com Press Contact: Carolyn Robinson IDT Worldwide Marketing Phone: (408) 284-8200 E-mail: carolyn.robinson@idt.com

IDT REPORTS FISCAL FOURTH QUARTER AND YEAR END 2009 RESULTS

SAN JOSE, Calif., April 30, 2009 — IDT^® (Integrated Device Technology, Inc.; NASDAQ: IDTI), a leading provider of essential mixed signal semiconductor solutions that enrich the digital media experience, today announced results for the fiscal fourth quarter and year ended March 29, 2009.

“Our fiscal fourth quarter results were in line with our updated projections provided on March 31, 2009,” said Dr. Ted Tewksbury, president and CEO of IDT. “Despite a sequential revenue decline resulting from weakened demand, excess channel inventory and normal seasonality, we were pleased to see our book-to-bill ratio for the March quarter above one as customer order patterns began to stabilize. In addition, we implemented a number of cost control measures which lower our non-GAAP EPS and free cash flow breakeven points, and reallocated R&D dollars to focus on select opportunities to expand our addressable market.

“We faced a challenging macroeconomic environment during our fiscal 2009, but we have embraced this disruptive opportunity to reinvent the company, hire some of the industry’s finest talent and develop innovative new growth platforms that will expand our market share and propel revenue growth when demand returns. I am confident that if we continue to innovate and execute at our current pace, IDT will emerge from this downturn as an even more vital extension of our customers’ development teams delivering increased value to our shareholders,” continued Tewksbury.

Recent Highlights

• IDT entered into a definitive acquisition agreement pursuant to which IDT will acquire Tundra Semiconductor for CDN $6.25 per share, for an aggregate purchase price of approximately CDN $120.8 million

• IDT introduced its new Power Smart technology and significantly expanded its power management expertise through the addition of its new analog design team

• H3C Technologies selected IDT PCI Express^® switching solutions for its SecPath high-end security systems

• IDT introduced a new member to its family of Serial RapidIO^® Central Packet Switches which provides increased bandwidth, configurability, and flexibility for next-generation cellular base stations

The following highlights the Company’s financial performance on both a GAAP and non-GAAP basis. The GAAP results include certain costs, charges, gains and losses in accordance with GAAP which are excluded from non-GAAP results based on management’s determination that they are not directly reflective of on-going operations. Non-GAAP results are not in accordance with GAAP and may not be comparable to non-GAAP information provided by other companies. Non-GAAP information should be considered a supplement to, and not a substitute for, financial statements prepared in accordance with GAAP. A complete reconciliation of GAAP to non-GAAP results is attached to this press release.

• Revenue for the fiscal fourth quarter of 2009 was $107.4 million, compared with $177.1 million reported in the same period one year ago. Revenue for fiscal year 2009 was $663.2 million, compared with $781.5 million in fiscal year 2008.

• GAAP net loss for the fiscal fourth quarter of 2009 was $719.2 million or a loss of $4.37 per diluted share, versus GAAP net income of $17.1 million or approximately $0.10 per diluted share in the same period one year ago. As a result of the current economic environment and decline in the market value of the Company, IDT has conducted a goodwill and intangible asset impairment analysis which resulted in a non-cash charge of $686.6 million. Fiscal fourth quarter 2009 GAAP results also include $18.3 million in amortization of intangibles, $6.6 million of stock-based compensation, and $5.4 million of severance-related expense. GAAP net loss for fiscal year 2009 was $1.0 billion, compared with GAAP net income of $34.2 million in fiscal 2008.

• Non-GAAP net loss for the fiscal fourth quarter of 2009 was $2.8 million or $0.02 per diluted share, compared with non-GAAP net income of $42.7 million or $0.24 per diluted share reported in the same period one year ago. Non-GAAP net income for fiscal year 2009 was $109.8 million or $0.65 per diluted share, compared with $181.8 million or $0.96 per diluted share in fiscal year 2008.

• GAAP gross profit for the fiscal fourth quarter of 2009 was $34.7 million, compared with GAAP gross profit of $77.9 million in the same period one year ago. Non-GAAP gross profit for the fiscal fourth quarter of 2009 was $49.1 million, compared with non-GAAP gross profit of $94.4 million reported in the same period one year ago. GAAP gross profit for fiscal 2009 was $276.0 million, compared with $339.3 million for fiscal 2008. Non-GAAP gross profit was $337.0 million for fiscal 2009, compared with $407.7 million for fiscal 2008.

• GAAP R&D expense for the fiscal fourth quarter of 2009 was $38.8 million, compared with GAAP R&D expense of $38.4 million in the same period one year ago. Non-GAAP R&D expense for the fiscal fourth quarter of 2009 was $31.9 million, compared with non-GAAP R&D expense of $33.0 million in the same

period one year ago. GAAP R&D expense for fiscal 2009 was $161.2 million, compared with $165.6 million for fiscal 2008. Non-GAAP R&D expense for fiscal 2009 was $137.8 million, compared with $141.6 million in fiscal 2008.

• GAAP SG&A expense for the fiscal fourth quarter of 2009 was $29.8 million, compared with GAAP SG&A expense of $34.1 million in the same period one year ago. Non-GAAP SG&A expense for the fiscal fourth quarter of 2009 was $20.7 million, compared with non-GAAP SG&A expense of $22.3 million in the same period one year ago. GAAP SG&A expense for fiscal 2009 was $125.8 million, compared with $161.7 million for fiscal 2008. Non-GAAP SG&A expense for fiscal 2009 was $90.9 million, compared with $97.6 million for fiscal 2008.

Webcast and Conference Call Information

Investors can listen to a live or replay webcast of the Company’s quarterly financial conference call at http://www.IDT.com. The live webcast will begin at 1:30 p.m. Pacific time on April 30, 2009. The webcast replay will be available after 5:00 p.m. Pacific time on April 30, 2009.

Investors can also listen to the live call at 1:30 p.m. Pacific time on April 30, 2009 by calling (800) 230-1085 or (612) 288-0329. The conference call replay will be available after 5:00 p.m. Pacific time on April 30, 2009 through 11:59 p.m. Pacific time on May 7, 2009 at (800) 475-6701 or (320) 365-3844. The access code is 993533.

About IDT

With the goal of continuously improving the digital media experience, IDT integrates its fundamental semiconductor heritage with essential innovation, developing and delivering low-power, mixed signal solutions that solve customer problems. Headquartered in San Jose, Calif., IDT has design, manufacturing and sales facilities throughout the world. IDT stock is traded on the NASDAQ Global Select Stock Market^® under the symbol “IDTI”. Additional information about IDT is accessible at www.IDT.com.

Forward Looking Statements

Investors are cautioned that forward-looking statements in this release, including but not limited to statements regarding demand for Company products, customer ordering patterns, channel inventory, anticipated trends in Company sales, expenses and profits, and macroeconomic conditions involve a number of risks and uncertainties that could cause actual results to differ materially from current expectations. Risks include, but are not limited to, global business and economic conditions, fluctuations in product demand, manufacturing capacity and costs, inventory management, competition, pricing, patent and other intellectual property rights of third parties, timely development and introduction of new products and manufacturing processes, dependence on one or more customers for a significant portion of sales, successful integration of acquired businesses and technology, availability of capital, cash flow and other risk factors detailed in the Company’s Securities and Exchange Commission filings. The Company urges investors to review in detail the risks and uncertainties in the

Company’s Securities and Exchange Commission filings, including but not limited to the Annual Report on Form 10-K for the fiscal year ended March 30, 2008 and Quarterly Report on Form 10-Q for the period ended December 28, 2008. All forward-looking statements are made as of the date of this release and the Company disclaims any duty to update such statements.

Non-GAAP Reporting

The Company presents non-GAAP financial measures because the financial community uses non-GAAP results in its analysis and comparison of historical results and projections of the Company’s future operating results. These non-GAAP results exclude impairment charges, acquisition-related charges, share-based compensation expense and certain other expenses and benefits. Management uses these non-GAAP measures to manage and assess the profitability of the business. These non-GAAP results are also consistent with another way management internally analyzes IDT’s results and may be useful. The Company has reconciled such non-GAAP results to the most directly comparable GAAP financial measures in the financial tables at the end of this press release.

Reference to these non-GAAP results should be considered in addition to results that are prepared under current accounting standards, but should not be considered a substitute for results that are presented in accordance with GAAP. It should also be noted that IDT’s non-GAAP information may be different from the non-GAAP information provided by other companies.

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IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners.

INTEGRATED DEVICE TECHNOLOGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

(In thousands, except per share data)

	Three Months Ended									Twelve Months Ended
	March 29, 2009			Dec. 28, 2008			March 30, 2008			March 29, 2009			March 30, 2008
Revenues	$	107,417		$	167,079		$	177,096			663,245			781,467
Cost of revenues		72,693			97,410			99,166			387,240			442,135
Gross profit		34,724			69,669			77,930			276,005			339,332
Operating expenses:
Research and development		38,795			37,247			38,408			161,193			165,599
Selling, general and administrative		29,753			30,879			34,051			125,808			161,708
Acquired in-process research and development		—			5,597			—			5,597			—
Goodwill and intangible assets impairment		686,634			339,051			—			1,025,685			—
Total operating expenses		755,182			412,774			72,459			1,318,283			327,307
Operating income (loss)		(720,458	)		(343,105	)		5,471			(1,042,278	)		12,025
Other-than-temporary impairment of investment		—			(3,000	)		—			(3,000	)		—
Interest expense		(13	)		(14	)		(13	)		(60	)		(103	)
Interest income and other, net		609			(1,150	)		3,075			1,308			16,815
Income (loss) before income taxes		(719,862	)		(347,269	)		8,533			(1,044,030	)		28,737
Income tax benefit		(683	)		(2,010	)		(8,565	)		(421	)		(5,442	)
Net income (loss)	$	(719,179	)	$	(345,259	)	$	17,098			(1,043,609	)		34,179
Net income (loss) per share:
Basic	$	(4.37	)	$	(2.06	)	$	0.10		$	(6.21	)	$	0.18
Diluted	$	(4.37	)	$	(2.06	)	$	0.10		$	(6.21	)	$	0.18
Weighted average shares:
Basic		164,735			167,412			178,132			168,114			187,213
Diluted		164,735			167,412			178,190			168,114			189,260

INTEGRATED DEVICE TECHNOLOGY, INC.

RECONCILIATION OF GAAP TO NON-GAAP

(Unaudited)

(In thousands)

	Three Months Ended									Twelve Months Ended
	March 29, 2009			Dec. 28, 2008			March 30, 2008			March 29, 2009			March 30, 2008
GAAP Net Income (Loss)	$	(719,179	)	$	(345,259	)	$	17,098		$	(1,043,609	)	$	34,179
GAAP Diluted Income (Loss) Per Share	$	(4.37	)	$	(2.06	)	$	0.10		$	(6.21	)	$	0.18
Acquisition Related:
Amortization of acquisition related intangibles		18,286			19,652			24,485			79,390			109,994
Acquisition related costs (1)		(3	)		(2	)		244			(11	)		2,290
Acquired In-process research and development (1)		—			5,597			—			5,597			—
Goodwill and intangible assets impairment		686,634			339,051			—			1,025,685			—
Other-than-temporary impairment of investment (2)		—			3,000			—			3,000			—
Restructuring Related:
Severance and retention costs		5,408			597			522			7,310			2,016
Assembly transition costs (3)		—			—			—			—			468
Facility closure costs (4)		28			50			106			173			401
Other:
Acquisition related interest income (5)		—			—			(781	)		—			(781	)
Stock-based compensation expense		6,619			9,012			8,221			32,402			41,242
Tax effects of Non-GAAP adjustments (6)		(616	)		(1,604	)		(7,216	)		(186	)		(7,977	)
Non-GAAP Net Income (Loss)	$	(2,823	)	$	30,094		$	42,679		$	109,751		$	181,832
Non-GAAP Diluted Income (Loss) Per Share	$	(0.02	)	$	0.18		$	0.24		$	0.65		$	0.96
Weighted average shares:
Basic		164,735			167,412			178,132			168,114			187,213
Diluted		164,735			167,438			178,190			168,297			189,260
GAAP gross profit		34,724			69,669			77,930			276,005			339,332
Acquisition Related:
Amortization of acquisition related intangibles		12,288			13,639			15,522			55,268			62,295
Acquisition related costs (1)		—			—			139			—			1,403
Restructuring Related:
Severance and retention costs		1,143			143			15			1,942			6
Assembly transition costs (3)		—			—			—			—			468
Facility closure costs (4)		5			15			64			48			268
Other:
Stock-based compensation expense		945			787			748			3,702			3,937
Non-GAAP gross profit		49,105			84,253			94,418			336,965			407,709
GAAP R&D Expenses:		38,795			37,247			38,408			161,193			165,599
Acquisition Related:
Amortization of acquisition related intangibles		(19	)		(19	)		(19	)		(76	)		(119	)
Acquisition related costs (1)		2			2			(56	)		8			(105	)
Restructuring Related:
Severance and retention costs		(3,337	)		(454	)		(468	)		(4,251	)		(730	)
Facility closure costs (4)		(20	)		(28	)		(28	)		(101	)		(85	)
Other:
Stock-based compensation expense		(3,525	)		(5,101	)		(4,791	)		(18,927	)		(22,919	)
Non-GAAP R&D Expenses		31,896			31,647			33,046			137,846			141,641
GAAP SG&A Expenses:		29,753			30,879			34,051			125,808			161,708
Acquisition Related:
Amortization of acquisition related intangibles		(5,979	)		(5,994	)		(8,944	)		(24,046	)		(47,580	)
Acquisition related costs (1)		1			—			(50	)		3			(783	)
Restructuring Related:
Severance and retention costs		(928	)		—			(38	)		(1,117	)		(1,279	)
Facility closure costs (4)		(3	)		(7	)		(14	)		(24	)		(48	)
Other:
Stock-based compensation expense		(2,149	)		(3,124	)		(2,682	)		(9,773	)		(14,386	)
Non-GAAP SG&A Expenses		20,695			21,754			22,323			90,851			97,632
GAAP Interest income and other, net		596			(1,164	)		3,062			1,248			16,712
Acquisition related interest income (5)		—			—			(781	)		—			(781	)
Non-GAAP Interest income and other, net		596			(1,164	)		2,281			1,248			15,931
GAAP Income Tax Benefit		(683	)		(2,010	)		(8,565	)		(421	)		(5,442	)
Tax effects of Non-GAAP adjustments (6)		616			1,604			7,216			186			7,977
Non-GAAP Provision (benefit) for Income Taxes		(67	)		(406	)		(1,349	)		(235	)		2,535

(1) Consists of costs incurred in connection with merger and acquisition-related activities, including legal and accounting fees. Also includes costs associated with our merger with ICS, such as additional depreciation resulting from purchase accounting and costs associated with the exit of previously leased facilities. In addition, the three month ended December 28, 2008 includes acquired IPR&D related to our acquisition of Silicon Optix's video processing technology and related assets.

(2) Consists of an other-than-temporary impairment charge related to our investment in non-marketable equity security.

(3) Consists of the costs incurred as the Company transitioned its assembly operations in Malaysia to a third-party.

(4) Consists of ongoing costs associated with the exit of our leased facilities.

(5) Consists of interest income from the tax settlement with IRS related to ICS pre-acquisition tax returns.

(6) Consists of the tax effects of non-GAAP adjustments related to acquisitions and stock-based compensation expense.

INTEGRATED DEVICE TECHNOLOGY, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

(In thousands)

	March 29, 2009		March 30, 2008
ASSETS
Current assets:
Cash and cash equivalents	$	136,036	$	131,986
Short-term investments		160,037		107,205
Accounts receivable, net		54,895		83,091
Inventories		71,278		79,954
Deferred Taxes		1,696		4,853
Prepaid and other current assets		19,881		26,081
Total current assets		443,823		433,170
Property, plant and equipment, net		71,561		81,652
Goodwill		89,404		1,027,438
Acquisition-related intangibles		50,509		204,489
Other assets		24,627		36,504
TOTAL ASSETS	$	679,924	$	1,783,253
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	25,837	$	44,655
Accrued compensation and related expenses		18,820		26,621
Deferred income on shipments to distributors		16,538		24,312
Income taxes payable		457		150
Other accrued liabilities		21,206		19,978
Total current liabilities		82,858		115,716
Deferred tax liabilities		3,220		7,678
Long term income taxes payable		20,907		20,673
Other long term obligations		14,314		18,364
Total liabilities		121,299		162,431
Stockholders’ equity		558,625		1,620,822
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	679,924	$	1,783,253