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A rectangle with set and reset inputs and no clock.
Also known as: Set-reset latch, SR bistable, RS latch, Rectangle with S and R
The SR latch is the simplest one-bit memory: assert set and the output goes high, assert reset and it goes low, assert neither and it remembers. Assert both and the output is undefined, which is the flaw every later flip-flop was designed around.
Denotes a set–reset latch: a level-sensitive one-bit store with separate set and reset inputs.
Contexts: Electrical equipment
Has an undefined or forbidden state when both inputs are asserted simultaneously, which is its defining limitation.
Contexts: Electrical equipment
Is level-sensitive rather than edge-triggered, so it responds continuously while an input is asserted rather than at a clock edge.
Contexts: Electrical equipment
An upright rectangle with the letters S and R marked on its left side and Q on its right, with no triangle at any input.