Title & Date: Page: 1 GLOBALPRESS SUMMIT 2010 April 26, 2010

Global Press Presentation Lattice Semiconductor Confidential Page: 2 SAFE HARBOR NOTICE This presentation contains forward-looking statements that involve estimates, assumptions, risks and uncertainties, including statements relating to our 2Q10 business outlook, the potential growth of various served markets, strong and consistent new product growth, continuing cost structure and reduction opportunities, and the potential growth of the programmable logic market. Lattice believes the factors identified below could cause actual results to differ materially from the forward-looking statements. Estimates of future revenue are inherently uncertain due to the high percentage of quarterly "turns" business. In addition, revenue is affected by such factors as global economic conditions which may affect customer demand, pricing pressures, competitive actions, the demand for our Mature, Mainstream and New products, the ability to supply products to customers in a timely manner and our actions to restructure our distribution channel. Actual gross margin percentage, operating expenses and operating income could vary from the estimates contained herein on the basis of, among other things, changes in revenue levels, changes in product pricing and mix, changes in wafer, assembly, test and other costs, variations in manufacturing yields, the failure to sustain operational improvements, the effects of transitioning certain distributors from the sell-to to the sell-through business model, and compensation charges due to stock price changes. Any unanticipated declines in revenue or gross margin, any unanticipated increases in our operating expenses or unanticipated charges, including without limitation, restructuring charges or any impairment charges related to an other- than-temporary decline in the fair value of auction rate securities held in Long-term marketable securities, could adversely affect our profitability during the quarter. In addition to the foregoing, other factors that may cause actual results to differ materially from the forward- looking statements herein include overall semiconductor market conditions, market acceptance and demand for our new and existing products, the Company's dependencies on its silicon wafer suppliers, the impact of competitive products and pricing, technological and product development risks, the compromised liquidity of the Company's auction rate securities, our ability to improve customer service by moving our warehouse to Singapore, our ability to improve our operational efficiencies by establishment of our Asia Operations Center, and the other risks that are described herein and that are otherwise described from time to time in our filings with the Securities and Exchange Commission. The Company does not intend to update or revise any forward- looking statements, whether as a result of events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Global Press Presentation Lattice Semiconductor Confidential Page: 3 AGENDA Where Lattice Is Today Chris Fanning, CVP & General Manager, Low Density & Mixed Signal Solutions Lattice’s Roadmap To The Future Sean Riley, CVP & General Manager, High Density Solutions Lattice’s Financial Achievements Bruno Guilmart, President & CEO Question Time

Global Press Presentation Lattice Semiconductor Confidential Page: 4 ABOUT LATTICE SEMICONDUCTOR Founded (1983); IPO 1989 (NASDAQ: LSCC) Design and develop programmable semiconductor products, which allow the end customer to determine functionality –FPGA, PLD, Mixed Signal Customers are primarily OEMs in the communications, computing, consumer, and industrial end markets Product development, manufacturing, and sales offices worldwide $194.4M revenue in 2009

Global Press Presentation Lattice Semiconductor Confidential Page: 5 Camera Wireless WHERE LATTICE COMPETES Linking People Together LCD TV Smartphone Lattice continuing to differentiate in its traditional Communications, Computing, and Industrial markets Low cost Low power High convenience Consumer is emerging as a good fit for PLD strengths Reducing time to market Mitigating ASIC development risk and cost Integrating discrete components Server

Global Press Presentation Lattice Semiconductor Confidential Page: 6 Source: iSuppli, “Core Silicon Market Tracker & Component AMFT – Q4 2009,” January 5, 2010 DIGITAL CAMERAS Picture A New PLD Market Lattice Product:MachXO4000ZE Function: Image RotationDiscrete Component Integration Why We Won: Cost Reduction, Technical Support, Supply Chain Year E Volume 110Mu 130Mu

Global Press Presentation Lattice Semiconductor Confidential Page: 7 LCD TV Shipments (Mu) Source: iSuppli, “Digital TV Semiconductor Q Market Tracker,” January 13, 2010 CAGR ’09 – ’13 15% LCD TV High Growth In High Definition Lattice Product: MachXO Function: LED backlight control Why We Won: Price, High IO Count, Non-Volatility

Global Press Presentation Lattice Semiconductor Confidential Page: 8 SERVERS Big Iron Opportunities Lattice Product: MachXO Function: Clock Generation, Bus / Memory Processor Interface Why We Won: Memory, PLLs, Price, Technical Support Source: iSuppli, “Core Silicon Market Tracker & Component AMFT – Q4 2009,” January 5, 2010 Year E Volume 7Mu 10Mu

Global Press Presentation Lattice Semiconductor Confidential Page: 9 Source: Unwired Insight, iSuppli, San Jose Business Journal – Cisco Systems, February 12, 2010 “20x increase in 3G traffic in the next 5 years” –Unwired Insight “Wireless data to double yearly through 2014” –Cisco “Wireless Comm to grow 10% annually through 2013” –iSuppli WIRELESS The Appetite Is Still Growing Key Lattice Product: LatticeECP3 Functions: Baseband and Radio Interfaces Why We Win: Low Power, High Value, Relevant IP

Global Press Presentation Lattice Semiconductor Confidential Page: 10 Source: Goldman Sachs, Frost & Sullivan CAGR ’09 – ’12 34% Smartphone Shipments (Mu) “Virtually all phones sold in the U.S. will be smart phones within 5 years” – Frost & Sullivan SMART PHONE Where The World Is Going Lattice Product: 4000ZE Functions: Discrete Integration, Level Shifting, Data Bus Control Why We Won: Lower Power, Small Form Factor, Halogen Free Packaging

Global Press Presentation Lattice Semiconductor Confidential Page: 11 WirelessSmartphone 4000ZE ✓ ✓ ✓ ✓ MachXO ✓ ✓ ✓ ✓ Power Manager ✓ ✓ ✓ LatticeECP3 ✓ ✓ LatticeXP2 ✓ ✓ LATTICE HAS SOLUTIONS ACROSS THE SPECTRUM 15% 10M10% 34% Units CAGR CameraLCD TV 130M Units Server

Global Press Presentation Lattice Semiconductor Confidential Page: 12 THREE PROGRAMMABLE DIGITAL SEGMENTS R&D Investment / Support Ultra-High Low Ultra-High Low Performance / Density Low Density Customer needs: cost & convenience Examples: handhelds, LCD displays, control & glue logic Mid-Range Customer needs: optimized blend of power and performance Examples: wireless interfaces, security & surveillance Ultra-High Customer needs: ultimate performance & density Example: ASIC emulation, 100G optical switches

Global Press Presentation Lattice Semiconductor Confidential Page: 13 LATTICE DIGITAL ROADMAP R&D Investment / Support Ultra-High Low Mid-Range Low Power High Value ECP2/M 90nm Low Density Low Cost High Convenience Channel Partnerships Performance / Density Non-Volatile Next Gen Mid-Range Next Gen SC90nm ECP3 65nm Ultra-High Low Ultra-High XO 130nm XP2 90nm 4KZE 180nm 2010

Global Press Presentation Lattice Semiconductor Confidential Page: 14 Ultra-High FPGA Market w/out Mid-Range FPGAs High Gross Margins MID-RANGE PRESENTS SIGNIFICANT OPPORTUNITY High Low Performance / Density Medium Gross Margins Low Density FPGA Fast SerDes High Speed I/O DSP/MACs Big Memory High Performance No SerDes Lower Speed I/O Minimal DSP Minimal Memory Low Performance

Global Press Presentation Lattice Semiconductor Confidential Page: 15 Ultra-High FPGA Market w/out Mid-Range FPGAs High Gross Margins MID-RANGE PRESENTS SIGNIFICANT OPPORTUNITY High Low Performance / Density Medium Gross Margins Low Density FPGA Fast SerDes High Speed I/O DSP/MACs Big Memory High Performance No SerDes Lower Speed I/O Minimal DSP Minimal Memory Low Performance Market with Mid-Range FPGAs Low Density FPGA Mid-Range FPGA Ultra-High FPGA SerDes High Speed I/O DSP/MACs Big Memory Mid-Range Performance Lower Price Lower Power

Global Press Presentation Lattice Semiconductor Confidential Page: 16 LATTICE MIXED SIGNAL ROADMAP Extending The Benefits Of Programmability Sequencing Monitoring Sequencing Monitoring Hot-swap Voltage Measurement Trimming/ Margining Power Manager I Power Manager II Sequencing Monitoring Hot-swap Voltage Measurement Trimming/ Margining Reset Tree NV Error Logging System Interface 2010 Platform Manager Sequencing Monitoring Hot-swap Voltage Measurement Trimming/ Margining Reset Tree NV Error Logging System Interface Fan Control User Logic Temperature Monitoring Current Measurement Next Gen Platform Manager II

Global Press Presentation Lattice Semiconductor Confidential Page: 17 QUARTERLY REVENUE Revenue ($M) ~6-10% +28%

Global Press Presentation Lattice Semiconductor Confidential Page: 18 CONSISTENT NEW PRODUCT REVENUE GROWTH New products: LatticeECP2/M/3, LatticeXP2, MachXO, Power Manager II, ispClock A/D/S, ispMACH 4000ZE Revenue ($M) 34% Quarterly Growth

Global Press Presentation Lattice Semiconductor Confidential Page: 19 LATTICE FPGA GAINING TRACTION 2009 / 08 FPGA Revenue Growth Source: Company financials, Lattice estimates FPGA Up 41% In 1Q10

Global Press Presentation Lattice Semiconductor Confidential Page: 20 PROFITABILITY ACCELERATING Strong Balance Sheet

Global Press Presentation Lattice Semiconductor Confidential Page: 21 Focused on programmable logic opportunities where we have sustainable and differentiated market positions –Good product position in large and growing markets –Differentiating with high- value, low power solutions Strong and consistent new product growth Accelerating profitability –Strong balance sheet SUMMARY Stock Price Jan. ‘09Apr. ‘10

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