# Write up L2 - Lab experiment date: September 5, 2008 Name:...

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Lab experiment date: September 5, 2008 Name: Eric Andrysiak Lab Day: Friday Lab time: 7:30am Lab instructor: Katham Lab number: 2 Title of experiment: Breadboarding Combinational Logic Circuits Write a technical response to each of these questions. Look at the truth table of circuit R. What is the overall logic function of this circuit? (A+B)+C Would it change the output if you rearranged the input variables for circuit R? The whole gate is a giant OR circuit. So, whenever you turn any 1 input on, the output is high. So, even if y ou rearanged the input variables, the outputs would still be high on everything except when all the inputs are low. Look at the truth table of circuit S. What is the overall logic function of this circuit? !(!A*!B) ! = ----- = Invert Can NAND gates create OR functions? Yes, an AND of A B, could be 00, 01, or 10. So, even though it has an AND in the name, it can still accept multiple input combinations How could you get rid of the 7404 inverters and use only NAND gates for this circuit? If, you have to NAND gates that both use AB and hook those 2 NAND gates up to a 3
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## This note was uploaded on 10/14/2009 for the course ECET 109 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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