Thank you for the prompt reply.
Yes, faster rise time would lend the "signal" and its generation to create
energetic RFI, but just in case there were some internal states that blew
power out, or high impedance return paths through the substrate that caused
all the outputs to dance in common mode horror would be examples of the
"gotchas" I was looking for.
- Robert -
-----Original Message-----
From: peter.pou...@invensys.com <peter.pou...@invensys.com>
To: Robert Macy <m...@california.com>
List-Post: emc-pstc@listserv.ieee.org
Date: Tuesday, March 19, 2002 8:23 PM
Subject: Re: Relative merits of various logic families in not generating RFI
>
>Robert,
>
>I suggest you have a look at the logic selection guides and application
>notes from the major semiconductor logic manufacturers.
>
>As a starting point, check out page 13 to 15 of
>http://www.fairchildsemi.com/ms/MS/MS-520.pdf for a rule-of-thumb guide on
>how to assess EMI generation from the manufacturer's specs for the logic.
>
>Generally the slower the rise & fall time, the lower the emissions.
>
>
>
>
>
>
> "Robert Macy"
> <m...@california.com> To:
<emc-p...@ieee.org>
> Sent by: cc:
> owner-emc-pstc@majordom Fax to:
> o.ieee.org Subject: Relative
merits of various logic families in not
> generating RFI
>
> 20/03/02 08:49
> Please respond to
> "Robert Macy"
>
>
>
>
>
>
>
>Group,
>
>What are the relative merits of the various logic families HCT, HC, AC, ACT
>with regard to generating RFI?
>
>I remember one time we replaced an HCT which made more noise than Schottky
>TTL due to an internal overlap in the switching causing a power rail
>"shorting" spike.
>
>I'm sure by now that most IC vendors have addressed the EMC problems
>associated with poorly designed chips, but what's the status on these now?
>
>What's the order of preference? Which one's best?
>
> - Robert -
>
> Robert A. Macy, PE m...@california.com
> 408 286 3985 fx 408 297 9121
> AJM International Electronics Consultants
> 619 North First St, San Jose, CA 95112
>
>
>
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