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Saturday, 31 December 2011

Explain the truth table and timing diagram of Gated S-R latch and Gated D latch in detail


S R Latch
The logic symbol for the S-R flip-flop is shown here and its operation outlined in Table below. Now we examine the output waveforms from the S-R flip-flop given the inputs. Assume that Q is HIGH initially.
The logic symbol for the D flip-flop is also shown below and its operation outlined in the Table. Notice that this flip-flop only has one input in addition to the clock called the D input.
Note that whatever is on the D-input when the trigger occurs is output at Q. Notice that a D flip flop can be made from a S-R flip flop by ensuring that the S and R outputs are the complement of each other at all times.