Alt-BEAM Archive
Message #05183
To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Steven Bolt sbolt@xs4all.nl
Date: Fri, 9 Jul 1999 12:26:11 +0200 (CEST)
Subject: [alt-beam] Re: Power Smart Head
On Fri, 9 Jul 1999, Don Papp wrote:
> On Thu, 8 Jul 1999, Wilf Rigter wrote:
>
> > BTW on the Darrell's original layout drawing the 2 unused
> > inverter inputs were not terminated to ground or +V resulting
> > in possible high current draw and oscillations.
>
> Hmm - grounded those rogue inputs to no effect. I'll email the
> list if/when I can try another FLED and it makes a difference.
Whether it makes a difference in any particular case depends on
accidental factors, but it is good practice to connect unused
cmos inputs to either Vcc or ground. You want to keep them out of the
linear region. Because they have an enormously high impedance
open inputs can just drift in there, for instance when they pick up
weak EM fields. And if someone touches them, they can be damaged by
static charges.
Best,
Steve
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# sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
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