Shares of Xilinx (XLNX) plunged in early Monday trading after the company's announcement that September-quarter sales will come in below its previous estimate.

The semiconductor maker said it now expects sales to be down 1% to 2% sequentially, below its prior forecast of sales being flat to up 4% sequentially.

Analysts surveyed by Thomson First Call were expecting the company to post sales of $415.3 million in the quarter, up about 2% sequentially.

Xilinx said that its turns business was less than forecast, and that sales from companies with manufacturing operations in the Asia Pacific region fell by double digits sequentially.

Sales of mainstream products also were below expectations, Xilinx said.

Shares of Xilinx were recently off $3.92, or 14.5%, to $23.20. The news also affected other chipmakers: Altera ( ALTR) slipped 40 cents, or 2.2% to $17.94, while Broadcom ( BRCM) was off 47 cents, or 1%, to $46.

More from Technology

Listen: Should You Buy Cisco Now?

Listen: Should You Buy Cisco Now?

Apple Buys Tesla? Amazon Buys Sears? 3 Dream Mergers That Just Make Sense

Apple Buys Tesla? Amazon Buys Sears? 3 Dream Mergers That Just Make Sense

Amazon Could Devastate Walgreens and Rite Aid by Getting Into Pharmacy Business

Amazon Could Devastate Walgreens and Rite Aid by Getting Into Pharmacy Business

Why PayPal's CEO Doesn't Fear Amazon Entering Mobile Payments

Why PayPal's CEO Doesn't Fear Amazon Entering Mobile Payments

3 Chip Stock Ideas for Value Investors

3 Chip Stock Ideas for Value Investors