Specialty semiconductor maker Xilinx Inc. cut its outlook for revenue growth in the current quarter, citing weak orders from its large North American customers. The San Jose-based company said it lowered its sequential revenue growth guidance for its fiscal third quarter to 5% to 7%, from 12%. Xilinx shares had closed up $1.69 at $41.69 on Nasdaq, but tumbled 12% in after-hours trading on the news. Xilinx's warning comes less than a week after chip maker Altera Corp. lowered its fourth-quarter revenue forecast, citing sluggish November sales. Xilinx said bookings from Europe, Japan and Southeast Asia remained on track to meet forecasts for the December quarter.