Buffer as a delay element — buffer gate

Why this example is worth doing

Chains of buffers are used deliberately to add delay, for clock alignment or to meet a hold-time constraint. It is the clearest example on the site of a circuit whose entire purpose is invisible in its truth table, because a truth table has no time axis. The page uses that gap to motivate timing diagrams, which is the representation the flip-flops page needs and the one combinational tools cannot provide.

Try your own input in the Buffer. Truth table, symbol and algebraic form for the non-inverting buffer, and what it is for.