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When cascading flip-flops which share the same clock (as in a shift register), it is important to ensure that the t CO of a preceding flip-flop is longer than the hold time (t h) of the following flip-flop, so data present at the input of the succeeding flip-flop is properly "shifted in" following the active edge of the clock.
If the output of the flip-flop is low, and a high clock pulse is applied with the input being a low pulse, then there is no need for a state transition. The extra computation to sample the inputs cause an increase in setup time of the flip-flop; this is a disadvantage of this technique. [3]
The output of a flip-flop is constant until a pulse is applied to its "clock" input, upon which the input of the flip-flop is latched into its output. In a synchronous logic circuit, an electronic oscillator called the clock generates a string (sequence) of pulses, the "clock signal".
Flip-flop and latch are not the same; so, they deserve separate pages (as it is). Flip-flop and latch are closely related; so, the two pages have to be closely related as well. The latch precedes chronologically the flip-flop. Eccles and Jordan have invented a latch, not a flip-flop; so, the data about their patent have to be placed on Latch.
This dual threshold action is called hysteresis and implies that the Schmitt trigger possesses memory and can act as a bistable multivibrator (latch or flip-flop). There is a close relation between the two kinds of circuits: a Schmitt trigger can be converted into a latch and a latch can be converted into a Schmitt trigger.
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