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Logic Gates

Q1:

What is the Boolean expression for a four-input OR gate?

A Y = A + B + C + D

B Y = A· B · C · D

C Y = A – B – C – D

D Y = A $ B $ C $ D

ANS:A - Y = A + B + C + D

In other words for a logic OR gate, any "HIGH" input will give a "HIGH", logic level "1' output. The logic or Boolean expression is given for a digital logic OR gate is that for Logical Addition which is denoted by a plus sign, (+) giving us the Boolean expression of A+B = Q.



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