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Subject: Re: I need an 8 to 256 decoder or equivalent
Date: Sat, 16 Nov 2002 15:01:02 -0000
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"Gibbo" wrote in message
> "David Jones" wrote:
> >I'm trying to use an 8 bit binary input to select 1 of 256 different
> >LEDS(I'm using leds as an example). I know there exists a 4bit input 16
> >output decoder but I don't know how to get 256 options using it with
> >IC's. How do I make the equivalent of an 8 to 256 decoder with the least
> >discete components? any suggestions are welcome.
> That's going to be big and unweidly.
> Instead think multiplexing and 16 X 16 array for the leds.Your component
> will drop substantially.
Yep, use a PLD with 8 inputs and 32 outputs and wire the LEDs as a 16x16
matrix. Alternatively, use a pair of 4 to 16 decoders, an inverting buffer
and a non-inverting buffer, and wire the LEDs as a matrix. Your 'example' of
LEDs is a good one because these are diodes, and you need them for
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