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To: Greg Thornton who wrote (1312)	7/31/1998 11:48:00 AM
From: Mike Botham	Read Replies (2) \| Respond to of 2126

Greg, The maximum digital frequency is 400Mhz. Yes it can drive fully differential signals. The maximum digital pin count was expected to be 384, although it has been 2 years since I worked at Teradyne and this may have changed. I don't know what the maximum analog pin count is. A Catalyst test head is about the size of your desk. I've never seen a Fusion test head. The reason I asked about the Fusion/Catalyst comparison is that I've read a number of things on this thread and other publications concerning this ability to test "systems on a chip". I really don't know what this means. How does this differ from what most people have come to expect from a "typical" mixed-signal tester (A5xx or Synchromaster). Is Fusion something really different or just a bigger faster Synchromaster. I was on the design team for the original A500. That was 13 years ago. Since then, the actual architecture of mixed signal testers has changed very little. The pin counts have grown. The Speeds have gone up. The stuff behind the pins is pretty much the same. I don't get what's so special about this one (Fusion) that makes it capable of testing systems on a chip in a way that other mixed signal testers can't. Mike Botham