The tech sector kicked off the week in the red on Monday, weighed down by declining shares of Texas Instruments which slipped 1.7% after the chipmaker was downgraded by FBR Capital to underperform from market perform. In a note, analyst Craig Berger argued that the company's third-quarter revenue guidance "could be worse than the Street." Shares of Cisco Systems , Intel Corp. and Microsoft Corp. also declined, joining the worst performers on the Dow Jones Industrial Average [s; djia] which lost more than 50 points. The Nasdaq Composite Index slid a fraction to 2,899, while the Philadelphia Semiconductor Index shed more than 1%. The sector got a lift from gains in shares of Apple Inc. and EMC Corp. .

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