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Digital circuit logic gates have a high or low output that is determined by the high or low voltage at the input(s). The NOT gate is the only logic gate with 1 input. All the other logic gates have 2 or more inputs.
The Output is the opposite state of the input.
- High input = Low output.
- Low input = High output.
The Schmitt Trigger version has an extra symbol in the middle of the NOT gate symbol. Some circuits depend on the Schmitt trigger circuitry. to work properly.
The AND gate comes with 2 or more inputs. 2 inputs is most common.
If any, or all of those inputs are low, then the output is low.
Every output needs to be high for the output to be high.
NAND gates have an output that is only low if all inputs are high. If one or more inputs are low, then the output is high.
The NAND gate is the inverse (opposite) of the AND gate.
The NAND gate is a universal logic gate. You you have enough NAND gates, you can make any other logic gate with them.
OR gates only have a low output if all inputs are low.
If one or more input is high, then the output is high.
The NOR Gate is the inverse (opposite) of the OR Gate.
When the NOR Gate inputs are both low, the output is high. But when one or more inputs are high, then the output is low.
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