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Altera

(ALTR) - Get Report

was down 28.7% in preopen

Island

trading. After Wednesday's close, the specialty chipmaker

lowered its guidance for fourth-quarter revenue, citing a sluggish November sales.

ABN AMRO

,

Goldman Sachs

and

Lehman Brothers

cut earnings estimates. Lehman Brothers also said that

Xilinx

(XLNX) - Get Report

, another specialty chipmaker, may lower revenue guidance on Monday. Xilinx lately was down 18.3%. In addition, Lehman downgraded

PMC Sierra

(PMCS)

to neutral from outperform. The stock was down 14% preopen. Other semiconductor stocks were broadly lower.

Intel

(INTC) - Get Report

was down 11%.

Advanced Micro Circuit

(AMCC)

was down 11.5%.