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[FAQ] What is the default output of a latched device? (Flip-Flop, latch, register)

Flip-flops, latches, and registers do not have a default state on power up.  The output is in an 'unknown' state until data is clocked through.

This is because the underlying latch circuit used to store the output value is inherently unstable at startup.  It could become a HIGH or a LOW at the output, and the value is impossible to determine before it is measured.


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