Article View: sci.electronics
Article #5353Re: Termination of TTL <-> TTL cable
From: Greg Ebert
Date: Mon, 30 Jul 1990 19:39
Date: Mon, 30 Jul 1990 19:39
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In article <26b48046.147d@petunia.CalPoly.EDU> jburch@polyslo.CalPoly.EDU (Jerry Burch) writes: > > >I am working on a project which needs to communicate over a ten foot cable >with TTL gates on either end. This one is 'compliments of the floppy drive manufacturers'. First, you alternate signal and ground lines (odd=GND/even=signal). Signals are driven by open-collector drivers, such as the 74XX38. At the other end of the cable, you pull-up w/150 ohms. If you parallel 2 drivers, you can terminate the line closer to its characteristic impedance, which is somewhere between 50 and 100 ohms; use a TDR scope and experiment.
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!zephyr.ens.tek.com!gvgpsa!gold!grege From: grege@gold.GVG.TEK.COM (Greg Ebert) Newsgroups: sci.electronics Subject: Re: Termination of TTL <-> TTL cable Message-ID: <1215@gold.GVG.TEK.COM> Date: 30 Jul 90 19:39:01 GMT References: <26b48046.147d@petunia.CalPoly.EDU> Distribution: na Organization: Grass Valley Group, Grass Valley, CA Lines: 12