write down voltage at logic level 0 and 1
Answers
Answer:
It depends on the logic family and the supply voltage. With 5V TTL, which uses bipolar transistors, a logic '0' is defined as less than 0.6V and a logic '1' as 2.4V, which are the levels where an input stage is guaranteed to be turned 'on' or 'off' respectively - note that a logic '0' turns a TTL input stage ON, since the input is a transistor emitter. With CMOS, which is by far the dominant technology today, a logic '0' is defined as less than 1/3, and a logic '1' as greater than 2/3, of the supply voltage, whatever that may happen to be. These are the levels at which the input stage is guaranteed to be driven fully into one state or the other. With the common supply voltage of 3.3V, these levels are <1.1V and >2.2V respectively.
Voltages intermediate between 1/3 and 2/3 of supply should be avoided with CMOS, as somewhere in that range is a region where the input stage acts as a linear amplifier. Normally a CMOS stage, properly driven, draws no current except at the moment of switching, but in the linear region it draws continuous current. This not only wastes power but can damage the device if it heats up too much. This is why unused inputs on a CMOS device should always be tied either to ground or supply, as an open circuit input tends to drift into the linear range.
Explanation:
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Answer:
In most circuits, logic 1 is represented by approximately +5 V (positive 5 volts) relative to ground, while logic 0 is represented by approximately the same voltage as ground (0 V). This system is called positive or active-high logic.
Explanation:
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