Digital Logic states in English article! DIGITAL

Digital Logic states in English article! DIGITAL ELECTRONICS

Digital Logic states in English article! DIGITAL ELECTRONICS.

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Digital logic states:

In digital electronics there are only two voltage states present at any point within a circuit. These voltage states are either high or low. The meaning of a voltage being high or low at a particular location within a circuit can signify a number of things. For example, it may represent the on or off state of a switch or saturated transistor. It may represent one bit of a number, or whether an event has occurred, or whether some action should be taken. 

The high and low states can be represented as true and false statements, which are used in Boolean logic.

In most cases, high = true and low = false. However, this does not have to be the case—you could make high = false and low = true. The decision to use one convention over the other is a matter left ultimately to the designer. In digital lingo, to avoid people getting confused over which convention is in use,the term 

Positive logic is used when high = true, while the term negative true logic is used when high = false.

In Boolean logic, the symbols 1 and 0 are used to represent true and false, respec- tively. Now, unfortunately, 1 and 0 are also used in electronics to represent high and low voltage states, where high = 1 and low = 0. As you can see, things can get a bit confusing, especially if you are not sure which type of logic convention is being used, positive true or negative true logic.The exact voltages assigned to a high or low voltage states depend on the specific 

logic IC that is used (as it turns out, digital components are entirely IC based). As a general rule of thumb, +5 V is considered high, while 0 V (ground) is considered low. F

example, some logic ICs may interrupt a voltage from +2.4 to +5 V as high and a voltage from +0.8 to 0 V as low.