Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In digital circuits, the contamination delay is the minimum time for a change at the input of a combinational circuit to affect the output. If there is insufficient delay from the output of one flip-flop to the input of the next, the input may change before the hold time has passed. Because the second flip-flop is still unstable, its data would then be "contaminated." Every path from an input to an output can be characterized with a particular contamination delay. Well-balanced circuits will have similar speeds for all paths through a combinational stage, so the minimum propagation time is close to the maximum. This corresponding maximum time is the propagation delay. The condition of data being contaminated is called a race.

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