EXHIBIT 75
 
CONTACTS:
     QUICKTURN DESIGN SYSTEMS, INC.     ABERNATHY MACGREGOR FRANK
     Ray Ostby                          Matt Sherman
     (408) 914-6000                     (212) 371-5999
 

FOR IMMEDIATE RELEASE

                MENTOR GRAPHICS TERMINATES PARTIAL TENDER OFFER

     MENTOR WITHDRAWS REQUEST FOR SPECIAL MEETING OF QUICKTURN STOCKHOLDERS
         AND WITHDRAWS SLATE OF DIRECTOR NOMINEES TO QUICKTURN'S BOARD

SAN JOSE, Calif., January 8, 1999 -- Quickturn Design Systems, Inc. (Nasdaq:
QKTN) announced today that Mentor Graphics Corporation (Nasdaq: MENT) has
withdrawn its request for a Special Meeting of Quickturn Stockholders, scheduled
for today, January 8, 1999, and has withdrawn its proposed slate of director
nominees and related proposals that were scheduled to be voted on at the Special
Meeting.  Mentor also announced that it has terminated its previously announced
unsolicited tender offer for 2,100,000 shares of Quickturn.

Keith R. Lobo, president and chief executive officer of Quickturn, said, "We are
extremely pleased with this outcome.  Now our Board can continue to manage the
business of Quickturn in the best interests of Quickturn's stockholders without
distraction.  Our Board believes that our definitive merger agreement with
Cadence provides our stockholders with superior value and tremendous upside
potential.  We look forward to completing our merger with Cadence as quickly as
possible for the benefit of all our stockholders."

Quickturn Design Systems, Inc. is the leading provider of verification products
and time-to-market engineering (TtME(TM)) services for the design of complex ICs
and electronic systems. The company's products are used worldwide by developers
of high-performance computing, multimedia, graphics and communications systems.
Quickturn is headquartered at 55 W. Trimble Road, San Jose, CA 95131-1013;
Telephone: 408/914-6000. For more information, visit the Quickturn Web site at
www.quickturn.com or send e-mail to info@quickturn.com.
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