Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!think.com!masscomp!peora!tarpit!osceola.cs.ucf.edu!jjohnson From: jjohnson@cs.ucf.edu (John Jjohnson) Newsgroups: sci.electronics Subject: Re: What's the fastest TTL-compatible XOR gate available commercially ? Message-ID: Date: 12 Apr 91 21:35:01 GMT References: <40750@netnews.upenn.edu> <7380022@hpnmdla.hp.com> <1991Apr11.154024.28033@zoo.toronto.edu> Sender: news@osceola.cs.ucf.edu (News sysetm) Organization: University of Central Florida Lines: 23 Your best bet is to consider the BiCMOS families which several companies are now making. The chips typically use 0.8 micron CMOS for the logic and blazing bipolar i/o pads. Fast stuff: I saw a '138 decoder with a 5ns delay going up and 1ns coming down! My data books are buried real deep, but you might call some reps/distribs: Texas Instruments - I believe their series is called BCT. (74BCT86?) National Semiconductor - ? Integrated Device Technology - FCT Saratoga Semiconductor -? Performance Semiconductor -? Sorry for the lack of details. One side note: If you are by any chance using the XOR gates to create opposite phase clocks with minimum skew, there is a standard logic chip made just for that (74xx???). Its outputs are guaranteed to change with less than 1ns of skew. Someone else recently introduced a master clock "spider and divider" for distributing clocks and fractions thereof... E-mail me if you really want me to dig. Mark J jjohnson@eola.cs.ucf.edu