Difference between revisions of "NAND (Chip)"
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Play with the 3 buttons to see the function of the NAND gate. You will see that the output is only | Play with the 3 buttons to see the function of the NAND gate. You will see that the output is only | ||
0 (low) if all 3 inputs are 1 (high). | 0 (low) if all 3 inputs are 1 (high). | ||
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Revision as of 01:49, 28 December 2016
In digital electronics, a NAND gate (negative-AND) is a logic gate which produces an output which is 0 (low) only if all its inputs are 1 (high); thus its output is complement to that of the AND gate. A 0 (low) output results only if all the inputs to the gate are 1 (high); if at least one of the inputs are 0 (low), a 1 (high) output results.
The NAND gate is significant because any boolean function can be implemented by using a combination of NAND gates. This property is called functional completeness.
If no signal is connected to an input pin, the input is read as 1 (high). This is done by internal pull-up resistors that pull the signal to high in the absence of an input signal. Using this mechanism the NAND gate can be used with 2 or 3 inputs in the exact same way.
Play with the 3 buttons to see the function of the NAND gate. You will see that the output is only 0 (low) if all 3 inputs are 1 (high).
