The OR gate - Digital Logic gates
Gates can be combined to make combinational or
sequential logic circuits. combinational circuits are a complex network
of gates interconnected to evaluate a pattern of output for patterns of
input.
Sequential circuits use memory elements, hence output
patterns depend both on input patterns and the memory of history of
events. An example of combinational logic circuit is a seven segment
display decoder CD4511 and and example for a sequential logic circuit
is CD4029 up-down counter.
OR Gate Simulation
This gate ORs the two inputs A and B, The Output is high
if either A OR B is high. There may be a OR gate with many inputs, if
one or more inputs are high then the output will be high.
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enabled
to try out the
demo of the gates below.
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A
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Q
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|
 |
 |
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B |
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Toggle the red buttons above to apply a
'high' or 'low' to inputs A and B and watch the output Q.
Truth table
| A
|
B
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Q
|
0
|
0 |
0
|
| 0 |
1 |
1 |
| 1 |
0 |
1 |
1
|
1 |
1
|
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