SR Latch - AND-OR vs NOR Implementation

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01:26:10

SR Latches (with Reset priority) built out of basic gates.

AND-OR version is according to Wiki page (https://en.wikipedia.org/wiki/Flip-flop_(electronics)#SR_AND-OR_latch)

NOR version is a De-Morgan simplification of the AND-OR version, i.e. (Q || S) & !R = (Q NOR S) NOR R.

(+) fewer gates
(+) SR chip (74LS279) can be substituted for NOR chips (74LS02) instead of multiple chips (AND, OR, NOT)
(+) less propagation delay
(-) NOR version powers on in an undefined state (~half of Vcc); EveryCircuit bug?

published 3 years ago

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