Number Systems : Binary Logic and Logic Levels

Binary Logic and Logic Levels:

A logic statement, is defined as a statement which is true if some condition is satisfied and false if that condition is not satisfied. For example, a bulb turns ON, if we close the switch, otherwise it is  OFF.

Positive Logic:

A "LOW" voltage level represents "logic 0" state and a comparatively "HIGH" output voltage level represents "logic 1" state, as shown bellow.

For example, 0 Volt represent a logic 0 state and  +5 Volt represent logic 1. This is called as "positive logic"

Positive Logic

Positive Logic: 

Logic 0 (LOW) = 0 V.

Logic 1 (HIGH) = +5 V.

Negative Logic:

A"LOW" voltage level represents "logic 1" state and a "HIGH" output voltage level represents "logic 0" state, as shown bellow.

For example, 0 Volt represent a "logic 1" state and +5 v represent "logic 0" state. This is called as "negative logic".

Negative Logic

Negative Logic: 

Logic 0 (LOW) = +5 V.

Logic 1 (HIGH) = +0 V.

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