Electrical Engineering › Section U · Sequential logic › Topic U.1

Latches and flip-flops

Feed a gate's output back to the input of another and the circuit starts to remember. Latches and flip-flops are the one-bit memories that every register, counter and processor is built from.

In this topic

  • Memory from feedback
  • The S-R latch
  • Worked example: tracing a NOR latch
  • Gated latches and the D latch
  • Edge-triggered flip-flops
  • The J-K flip-flop
  • Worked example: a J-K sequence
  • Preset, clear, and timing limits
  • Worked example: how fast can the clock run?
  • Flip-flop applications
  • Common mistakes to avoid
  • Key takeaways

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