SR NAND Latch Active-Low Operation
An SR NAND latch uses active-low inputs to update its state, where a LOW on S_bar sets Q to 1 and a LOW on R_bar resets Q to 0. Three signals are shown: S_bar (active-low set input), R_bar (active-low reset input), and Q (output, initially 0). Trace Q across all 8 time steps.
Constraints
S_bar= 0 andR_bar= 0 occurring simultaneously is an invalid state and does not appear in this waveform.- When both inputs are HIGH (
S_bar= 1,R_bar= 1), the latch holds its previous value.
Topics
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