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From: "Michael F. Coyle"
References: <7UjB9.9017$N02.email@example.com> <firstname.lastname@example.org>
Subject: Re: I need an 8 to 256 decoder or equivalent
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Sat, 16 Nov 2002 20:38:05 GMT
NNTP-Posting-Date: Sat, 16 Nov 2002 15:38:05 EST
Organization: Optimum Online
"Bertrand" wrote in message
> > You would need seventeen 74xx154's. First, wire the bottom 4 address
> > (let's call them ADDR3 thru ADDR0) to the '154's address inputs A3-A0.
> It would use a lot of board-space; why not using a small
> EPLD/FPGA/things-that-can-be-programmed ?
If the OP is having trouble understanding decoders, he may not be capable of
programming FPGA's. Anyway, the interconnect wiring between the 256 outputs
and the 256 loads will take far more board space than the IC's themselves.
Others have suggested a matrix arrangement; this would reduce the wiring
The OP mentioned LED loads as a "for-instance." It seems pointless to
speculate on design choices until we know exactly what he wants to do.
Remove "No Spam Please" from return address.
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