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  #1  
Old 11-10-2010, 07:27 AM
Ranjita ningthoujam Ranjita ningthoujam is offline
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Default construct a 3-8 decoder using a 2-4 decoder

I want to know how to construct a 3-8 decoder using a 2-4 decoder
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  #2  
Old 11-10-2010, 10:14 AM
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bertus bertus is online now
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Hello,

I moved your post from the other thread, as it is an other question.
Now you have your own thread.

Bertus
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Old 11-10-2010, 12:12 PM
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Look here

http://www.play-hookey.com/digital/d...emux_four.html

That show the simple arrangement of a 2 to 4 bit. By adding a third input stage and four more AND gates you get the 3 to 8 bit. Hint: some of the AND gates will now require 4 inputs max.

Can you show the truth tables for a 2 to 4 and a 3 to 8?
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Old 11-11-2010, 02:17 AM
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http://www.doc.ic.ac.uk/%7Edfg/hardw...eLecture12.doc
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