The 'OR' Gate
Category : JEE Main & Advanced
(1) It has two inputs (A and B) and only one output (Y)
(2) Boolean expression is \[Y=A+B\] and is read as "Y equals A OR B"
(3) Realization of OR gate
(i) \[A=0,\,\,B=0\] Both diodes \[{{D}_{1}}\] and \[{{D}_{2}}\] do not conduct and hence \[Y=0\]
(ii) \[A=0,\,B=1\] \[{{D}_{1}}=\] Does not conducts, \[{{D}_{2}}=\]Conducts, hence \[Y=1\]
(iii) \[A=1,\,B=0\] \[{{D}_{1}}=\] Conducts, \[{{D}_{2}}=\]
Does not conduct, hence \[Y=1\] (iv) \[A=1,\,B=1\] Both \[{{D}_{1}}\] and \[{{D}_{2}}\] conducts, hence \[Y=1\] (4) Truth table for 'OR' gate
| A | B | Y = A + B |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
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