Question
Download Solution PDFFor a 3-input OR gate, with the input waveforms as shown below, which output waveform is correct?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
The truth table for a 3-input OR gate is as shown:
|
A |
B |
C |
X |
|
0 |
0 |
0 |
0 |
|
0 |
0 |
1 |
1 |
|
0 |
1 |
0 |
1 |
|
0 |
1 |
1 |
1 |
|
1 |
0 |
0 |
1 |
|
1 |
0 |
1 |
1 |
|
1 |
1 |
0 |
1 |
|
1 |
1 |
1 |
1 |
Application:
For a 3 input OR gate, the output is high if anyone of the input is high.
The output waveform will be high when any of the input is high. The output waveform b is, therefore, the output waveform.
Mistake PointsOutput waveform 'd' might look like the correct answer, but we can note that this waveform for 'd' is starting with logic LOW which is not possible, as the input waveform 'C' is starting with logic HIGH.
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