Koichi Kamoshida/Getty Images Japanese chip companyRenesas Electronics is in talks to acquire U.S. chipmakerMaxim IntegratedProducts in a deal that could be valued up to $20 billion, CNBC reported on Monday. A deal is not imminent and one may not happen, CNBC said. Neither company was immediately available for comment when contacted by Reuters. Maxim's shares ended 12.3 percent higher at $66.27 on the Nasdaq on Monday following the report.