digital logic help !

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yusuf

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hi guys !
I want help regarding digital logic ! if any circuit is provided then i will be glad..


If three input is high then output should be high..

and if two input is high and one input is low then output should be low
and if one input is high and rest input(two input) is low then output should be low

in brief , if three input is high then only the output should be high else low
 
It depends on what logic family you want to use which depends on stuff like the power supply voltages and what voltage is high and low.

A 4 input NAND gate is probably more common, so this **broken link removed** could work.

You would have to tie the unused input to High AND,
take the second gate and tie all of the inputs together and attach to the output of your first gate.

A 1 input NAND gate is a NOT gate.

AND invereted is a NOT AND gate
 

If simple circuit is provided then It will be helpfull
 
OK AND IF i WANT ...

If three input is high then output should be LOW..

and if two input is high and one input is low then output should be HIGH
and if one input is high and rest input(two input) is low then output should be HIGH
 
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