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# RS Flip-Flop (RS Latch)
The RS (Reset-Set) flip-flop is a basic sequential logic circuit used to store one bit of information. It consists of two inputs, Set (S) and Reset (R), and two outputs, Q and Q̅ (the complement of Q). The circuit is typically built using two cross-coupled NOR gates, which create a feedback loop that allows the latch to remember its previous state.
The operation of the RS flip-flop depends on the values applied to the inputs. When S is equal to 1 and R is equal to 0, the circuit enters the Set state and the output Q becomes 1. When S is equal to 0 and R is equal to 1, the circuit enters the Reset state and Q becomes 0. If both inputs are 0, the circuit keeps its previous state, acting as a memory element. When both S and R are 1, the circuit enters a forbidden state that may lead to unpredictable behavior.
The truth table of the RS flip-flop defines the relationship between the inputs and outputs and shows how the circuit changes or maintains its state depending on the values of S and R.
RS flip-flops are widely used in digital electronics as simple memory devices and as building blocks for more advanced sequential circuits. They are commonly found in control systems, data storage circuits, and digital logic applications where information must be retained until a new input signal is received.
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