Alt-BEAM Archive
Message #06658
To: beam@sgiblab.sgi.com
From: Sean Rigter rigter@cafe.net
Date: Mon, 11 Oct 1999 19:57:27 -0700
Subject: [alt-beam] Re: F?!?!
Not much good for BEAM I'm afraid. These 74F240 chips normally run hot at 5V
and 100ma so forget solar or even battery. Moreover the input current is too
high and the output voltage does not swing rail to rail. Altogether a
"writeoff" most hobby applications. The modern replacement is the 74AC240 (if
you can get it) which is almost perfect for BEAM.
regards
wilf
Iv Clarence Harper wrote:
> I was going through some newly acquisition junk-box material when I came
> across a bunch of boards that had been manufactured by digital. While
> peruse them for salvage, I can across two banks of 20pin ICs marked as
> 74F240's. Does anyone know what the F stands for?
>
> I found the datasheet for it at
> http://www.mot-sps.com/books/br1514a/pdf/mc74f240rev5.arch.pdf
> but I'm having difficulty interpretting it.
>
> Would these be good for solarized applications, battery only, or should I
> not even waste my time trying to pull them off the board?
>
> thanks
> -Clarence
> ~~~~~
> Never before has such silliness passed as serious business
> ~~~~~
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