In addition there are sub families within these families that may have different defined levels. These levels are fairly standard throughout a particular family, although there can be minor differences in these and other parameters, between products from different manufacturers. The range of voltages allowed for a particular logic level depends on the amount of current flowing into or out of the logic gate inputs or output, the larger the current the output is supplying, the lower the output voltage will be.Įach output will supply a certain amount of current before the output voltage falls too far to be called logic 1, and each gate input will need to be supplied with a certain amount of current to raise the input voltage sufficiently to be recognised as logic 1.Įxamples of typical logic levels at inputs and outputs in a range of logic families are illustrated in Fig. Within any family of ICs the voltages and currents indicating 1 and 0 cover defined ranges unique to that logic family. Logic 1 and Logic 0 are not simply 5V and 0V or even Vcc and Ground.
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