Digital Systems: Principles and Design

Sequential Logic,

Latches and Flip-Flops

Recall that a combinational circuit is a circuit made up by combining the logic gates such

that the required logic at the output(s) depends only on the input logic conditions, both

completely specified by either a truth table or by a Boolean expression. Also (i) An

output(s) remains constant, as long input conditions do not require the change in the

output(s), (ii) An output depends solely on the current input condition(s) and not on any

past input condition(s) or past output condition(s), (iii) A combinational circuit has no

feedback of the output from a stage to the input of either that stage or any previous ...