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f-alpha.net » Electronics » Electronics Lab » Glossary » Asynchronous Input

Asynchronous Input

Asynchronous inputs are an integral part of flip-flops. They are referred to as "SET" and "RESET" or "PRESET" and "CLEAR"...

  • SET sets the output Q to "1"
  • RESET sets the output Q to "0"

In contrast, the R, S, J, K and D inputs of flip flops are synchronous inputs. Synchronous inputs have only in combination with a clock signal impact on the state at the output Q.

Examples of circuits with synchronous inputs...

  • Flip-Flop
  • Shift Register
  • Counter

Notes...

  • Asynchronous inputs are often referred to as "Override" inputs.

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