Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83 SMI; site sun.uucp Path: utzoo!watmath!clyde!floyd!harpo!decvax!decwrl!sun!wmb From: wmb@sun.uucp (Mitch Bradley) Newsgroups: net.micro Subject: Re: Terminating Resistors Message-ID: <607@sun.uucp> Date: Fri, 16-Mar-84 22:47:47 EST Article-I.D.: sun.607 Posted: Fri Mar 16 22:47:47 1984 Date-Received: Sun, 18-Mar-84 07:55:18 EST References: <2159@ecsvax.UUCP> Organization: Sun Microsystems, Inc. Lines: 14 > Usually signals traversing on a cable requires consideration as a > transmission line when the traversal time in the cable begins to > approximate the timing of the logic gate. Most TTL gates have > propagation times of 10-15 ns. Actually, the propagation time of the gate doesn't matter as much as the rise/fall times of the output. Rise and fall times depend on the logic family and the loading. TTL of the "F" variety (Fairchild Advanced Schottky TTL) can have fall times on the order of 1 nsec. Obviously, "F" is not recommended for driving long unterminated lines! Mitch Bradley Sun Microsystems, Inc.