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flip-flop
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circuit that has two stable states and can be used to store state information
A flip-flop is an electronic circuit that can exist in one of two stable states and is used to store information in digital devices. It matters because it forms the basic building block for memory and data storage in computers and other electronic systems.
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An SR latch (R1, R2 = 1 kΩ; R3, R4 = 10 kΩ)
In electronics, flip-flops and latches are circuits that have two stable states that can store state information – a bistable multivibrator. The circuit can be made to change state by signals applied to one or more control inputs and will output its state (often along with its logical complement). It is the basic storage element in sequential logic. Flip-flops and latches are fundamental building blocks of digital electronics systems used in computers, communications, and many other types of systems.