Digital Circuits

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Terminology

Active Low Input

An active low input means that it is "on" when in input is low, and "off" when the input is high. In schematic diagrams, it is often denoted by a "bubble" at the input pin.

High

High usually corresponds to the binary "1", the "on" state, and "true" or "1" in Boolean logic.

Low

Low usually corresponds to the binary "0", the "off" sate, and "false" or "0" in Boolean logic.

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