building circuit using a decoder

Thread Starter

facetten

Joined Nov 1, 2007
11
Show how to build all four of the following functions using one SSI package (four 2-input gates) and one 41x138

F1= X'*Y'*Z'+X*Y*Z
F2= X'*Y'*Z'+X*Y*Z'
F3= X'*Y*Z'+X'*Y*Z
F4= X*Y'*Z'+X'*Y*Z
can anyone give me some ideas of how to approach this problem?
 

beenthere

Joined Apr 20, 2004
15,819
You will need more gates. One quad AND will not be sufficient. Some XOR functions will be necessary to evaluate the NOT conditions, as well as some NOR and NAND gates. One three input NAND, for instance, will be TRUE for X'*Y'*Z' as inputs.
 

Ron H

Joined Apr 14, 2005
7,063
You will need more gates. One quad AND will not be sufficient. Some XOR functions will be necessary to evaluate the NOT conditions, as well as some NOR and NAND gates. One three input NAND, for instance, will be TRUE for X'*Y'*Z' as inputs.
I think he/she meant to say that there is a 74xx138 available also.
 

Thread Starter

facetten

Joined Nov 1, 2007
11
there is a 74x138 available, well it's past the due days already, so i just connected the outputs to NAND gates
 
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