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NNTP-Posting-Date: Tue, 19 Nov 2002 16:38:43 -0600
From: "David Jones"
References: <7UjB9.9017$N02.firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <8R-cnRA7Wa8lI0ugXTWcqw@comcast.com> <email@example.com>
Subject: Re: I need an 8 to 256 decoder or equivalent
Date: Tue, 19 Nov 2002 17:26:47 -0500
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you know what. I had heard of that idea in the past but you just reminded me
and now I realize its significance. thank you very much. I don't know
exactly how to the mechanics work and stuff but I think I can figure that
"Alan Fowler" wrote in message
> "David Jones" wrote:
> >well, I don't know what the device your talking about is but price really
> >doesn't matter for this project unless the parts are like hundreds of
> >dollars. size is essential so I will consider. right now actually I need
> >go back and take a couple days to learn about digital electronics in
> >because I've been trying to take short cuts and am not getting very far.
> >think it would be more effective to learn the theory and theory of
> >components before I try to build much.
> >thanks for the help
> Try using two four bit to 16 output decoders. can't
> remember the part number, it's 20 years or so since I did
> this sort of thing.
> Connect the first to the top four bits, the second
> to the bottom four bits, and you now have two lots of 16
> outputs. Use these as an X-Y matrix, with a LED at each
> >"Keith R. Williams" wrote in message
> >> In article <firstname.lastname@example.org>,
> >> email@example.com says...
> >> > "Bertrand" schreef in bericht
> >> > news:firstname.lastname@example.org...
> >> > > Hi,
> >> > >
> >> > > > You would need seventeen 74xx154's. First, wire the bottom 4
> >> > bits
> >> > > > (let's call them ADDR3 thru ADDR0) to the '154's address inputs
> >> > >
> >> > > :\
> >> > > It would use a lot of board-space; why not using a small
> >> > > EPLD/FPGA/things-that-can-be-programmed ?
> >> >
> >> > Which small EPLD/FPGA/thing-that-can-be-programmed
> >> > with 256 outputs do you recommend ?
> >> A "little" overkill but the Virtex-Pro 2VP4 (FF672 package)or perhaps
> >> two 2VP2s (FG256 package). There's all sorts of other toys in there
> >> for blinkin' lights too.
> >> http://www.xilinx.com/xlnx/xil_prodcat_landingpage.jsp?title=Virtex-
> >> II+Pro+FPGAs
> >> Well they *are* smaller than 17 74XX154s and you didn't say you were on
> >> a budget. ;-)
> >> ----
> >> Keith
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