PMC-Sierra Inc slumped US$3.98 to US$34.70, Linear Technology Corp fell US$3.14 to US$53.81, Xilinx Inc dropped US$2.96 to US$46.41 and National Semiconductor Corp declined US$1.91 to US$29.13.
Among other active stocks, Cisco Systems Inc fell US$1.33 to US$20.49, Sun Microsystems Inc shed US$1.02 to US$17.01, Ciena Corp slid US$5.70 to US$56.14 and Microsoft Corp declined US$0.49 to US$73.19.
Molex Inc fell US$2.07 to US$35.47. The maker of electrical and fiber-optic connectors lowered its fiscal fourth-quarter profit forecast for the second time, will cut about 900 workers and 600 temporary positions and will close three plants to reduce costs.
Lattice Semiconductor Corp lost US$0.98 to US$24.92. The maker of programmable chips expects second-quarter revenue to fall a larger-than-expected 30 percent from the previous three months because of poor demand for communications and computer chips.
TranSwitch Corp fell US$2.46 to US$12.40. The maker of chips for Internet and telecommunications gear said it expects a loss in the second quarter while analysts had forecast a profit.
Handspring Inc fell US$0.95 to US$$7.95. The maker of handheld computers said sales will be half of forecasts this quarter after demand slumped and it cut prices to compete with rival Palm Inc Palm fell US$0.23 to US$6.03.
Rockwell International Corp fell US$3.66 to US$41.60. The largest maker of factory-automation equipment reduced its fiscal third-quarter earnings forecast to US$0.45 a share, 45 percent below analysts' estimates, because of slowing sales. The company also said it would eliminate 1,000 jobs and take a US$50 million pretax charge.
Callaway Golf Co declined US$3.43 to US$15.03 after the golf-club maker lowered its sales forecast for the second quarter, citing delayed orders, bad weather, economic concerns and a ban on its ERC II Driver.
Quaker Oats Co fell US$0.51 to US$95.90. PepsiCo Inc's purchase of the maker of top-selling Gatorade sports drinks will be delayed by longer-than-expected discussions with the US Federal Trade Commission over complaints PepsiCo would have too much power over the sports-drink market.
PepsiCo moved US$0.19 higher to US$44.50.
The Russell 2000 Index of smaller stocks fell 3.13, or 0.6 percent, to 511.64. The Wilshire 5000 Total Market Index, the broadest measure of US shares, lost 114.51, or 1 percent, to 11,736.72. The market value of US stocks declined US$131.7 billion.
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