Similarly, if a value of 1 is input, the gate outputs a 0, as shown in the bottom row. A NOT gate is a logic gate with one binary input and one binary output. The function of a NOT gate is to invert a value so that the input value is not the output. Now that we have discussed the function of a NOT gate, let us work through a couple of examples. Recall that a NOT gate takes an input value, inverts it, and passes the inverted value as an output.
Recall that a NOT gate inverts its input, meaning that if the input is 1, the output will be 0. Further, if the input is 0, the output will be 1. In other words, the input value is not the output.
It is important to understand how to combine NOT gates. In this case, each individual gate behaves as we have seen so far, and the output of one gate gets passed along as the input for the next gate. Let us look at some examples where NOT gates are connected together. The diagram shows three NOT gates connected as part of a logic circuit.
The truth table shows the two different possible inputs. Here we have the truth table for three NOT gates combined in series. Each individual gate behaves as normal, simply inverting the input value so that the input is not the output.
To fill out the truth table, we will work through the gates one by one, determining their outputs in order. When we input a value of 0 to the first gate, it outputs a 1. This value is passed along as the input for the second gate. As shown below, the second gate outputs a 0. Thus, we know that if this combination of NOT gates has an input value of 0, the final output value will be 1.
Now let us consider the three NOT gates combined in series with an initial input value of 1, which is shown in the diagram below. Like before, the original input value is inverted three times, so the final output of this series combination of three NOT gates is 0. Thus, when this combination of NOT gates has an initial input value of 1, it has a final output value of 0. Following the same pattern that we just explored, we can imagine what would happen for any other odd-numbered series combination of NOT gates.
Each NOT gate takes turn alternating values, so the inversions of any two consecutive NOT gates end up effectively canceling one another. Thus, we know that that any odd-numbered series combination of NOT gates will have alternate input and output values.
In other words, if we input a value into an odd-numbered series combination of NOT gates, the final output will have the same value as a single NOT gate would have. This is worth restating. Four NOT gates are connected together in series. Recall that the job of a NOT gate is to invert a value so that the input value is not the output.
We will work through the gates one by one, beginning with the first NOT gate. Here we input a value of 0, so the first gate outputs a 1. This value of 1 becomes the input for the second gate.
We continue this pattern of inverting values at each gate until we reach the end, as summarized by the diagram below. A NOT gate performs logical negation on its input. In other words, if the input is true , then the output will be false. Similarly, a false input results in a true output. Each of the symbols below can be used to represent a NOT gate.
There are multiple international standards defined, and one may preferred over the other in your region of the world. Inverter logic gate on Wikipedia. Simulate with Logicly Logicly provides an engaging, hands-on learning environment for teaching logic gates and circuits. Trusted by Teachers I just wanted to thank you for creating the Logicly gate simulation. Michael Gamson, Hillel School of Tampa. Enjoyed by Students I'd just like to thank you for making Logicly.
Andrew Sum. The truth table for a NOT gate appears to the right.
0コメント