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Active high s-r latch truth table11/19/2022 It is an active high input SR flip – flop. SR flip flop can also be designed by cross coupling of two NOR gates. The table below summarizes above explained working of SR Flip Flop designed with the help of a NAND gates So the flip flop is in undefined state (or forbidden state). Because the low inputs of S and R, violates the rule of flip – flop that the outputs should compliment to each other. When both the SET and RESET inputs are low, then the flip flop will be in undefined state. This will cause the output of the flip – flop to settle in SET state. So both the inputs of the NAND gate with R input are 1. Because the low input of NAND gate with S input drives the other NAND gate with 1, as its output is 1. When SET input is LOW and RESET input is HIGH, then the flip flop will be in SET state. This will cause the output of the flip – flop to settle in RESET state. So both the inputs of the NAND gate with S input are 1. Because the low input of NAND gate with R input drives the other NAND gate with 1, as its output is 1. When SET input is HIGH and RESET input is LOW, then the flip flop will be in RESET state. When both the SET and RESET inputs are high, then the output remains in previous state i.e. The circuit of SR flip – flop using NAND gates is shown in below figure It is an active low input SR flip – flop. SR flip flop can be designed by cross coupling of two NAND gates. The two types of unclocked SR flip – flops are discussed below Unclocked S-R Flip-Flop Using NAND Gate Unclocked or simple SR flip – flops are same as SR Latches. The SR flip – flops can be designed by using logic gates like NOR gates and NAND gates. For the same clock situation, if the R input is at high level (logic 1) and S input is at low level (logic 0), then the SR flip – flop is said to be in RESET state and the output of the SR flip – flop is RESET to 0. it can be either positive edge triggered or negative edge triggered.įor a positive edge triggered SR flip – flop, suppose, if S input is at high level (logic 1) and R input is at low level (logic 0) during a low – to – high transition on clock pulse, then the SR flip – flop is said to be in SET state and the output of the SR flip – flop is SET toġ. SR flip – flop works during the transition of clock pulse either from low – to – high or from high – to – low (depending on the design) i.e. The symbolic representation of the SR Flip Flop is shown below. Hence it is also called Set – Reset flip – flop. The S and R in SR flip – flop means ‘SET’ and ‘RESET’ respectively. SR flip – flop is one of the most vital components in digital logic and it is also the most basic sequential circuit that is possible. Like all flip – flops, an SR flip – flop is also an edge sensitive device. SR flip – flop has two stable states in which it can store data in the form of either binary zero or binary one. SR flip – flop is a memory device and a binary data of 1 – bit can be stored in it. The SR flip – flop is one of the fundamental parts of the sequential circuit logic.
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