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A gated SR latch circuit diagram constructed from AND gates (on left) and NOR gates (on right) A gated SR latch can be made by adding a second level of NAND gates to an inverted SR latch. The extra NAND gates further invert the inputs so a SR latch becomes a gated SR latch (a SR latch would transform into a gated SR latch with inverted enable).
Semistatic C-element stores its previous state using two cross-coupled inverters, similar to an SRAM cell. One of the inverters is weaker than the rest of the circuit, so it can be overpowered by the pull-up and pull-down networks. If both inputs are 0, then the pull-up network changes the latch's state, and the C-element outputs a 0. If both ...
A latch is either level-triggered or always transparent, a flip-flop is edge-triggered - the clock has nothing to do with this. Fresheneesz 21:01, 3 November 2006 (UTC) As states, the difference between a latch and a flip-flop is that a latch doesn't have a clock signal, and a flip-flop does. Yes, you can apply an oscillating signal on a latch ...
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.
A simple example of metastability can be found in an SR NOR latch, when both Set and Reset inputs are true (R=1 and S=1) and then both transition to false (R=0 and S=0) at about the same time. Both outputs Q and Q are initially held at 0 by the simultaneous Set and Reset inputs.
In order to complete the excitation table of a flip-flop, one needs to draw the Q(t) and Q(t + 1) for all possible cases (e.g., 00, 01, 10, and 11), and then make the value of flip-flop such that on giving this value, one shall receive the input as Q(t + 1) as desired.
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8-bit D-type transparent read-back latch, inverting three-state 20 SN74ALS991: 74x992 1 9-bit D-type transparent read-back latch, non-inverting three-state 24 SN74ALS992: 74x993 1 9-bit D-type transparent read-back latch, inverting three-state 24 SN74ALS993: 74x994 1 10-bit D-type transparent read-back latch, non-inverting three-state 24 SN74ALS994