2010-09-20

High impedance of output

In digital circuit, the output line has usually three states, namely, 0, 1 and high impedance.
In the state of 0 or 1, the output line has a low impedance. When the output in the high impedance state, the output line will be effectively removed from the rest of circuit. In such way, it allows multiple circuits to share the same output line.

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