Active low

Encyclopedia : A : AC : ACT : Active low

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Active-low signals are used in electronic logic circuits to represent binary values by means of two different voltages. The higher voltage represents a binary 0 or "space", and the lower voltage represents a binary 1 or "mark".

The name of an active-low signal is written with a bar above it to distinguish it from an active-high signal. For example, the name [\overline}], read "stop bar", represents an active-low signal.

RS232 signalling, as used in computer COM ports, uses active-low signals.

 

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