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f-alpha.net » Electronics » Digital Electronics » Flip-Flop » Know more... » Experiment 21 - RS Latch with NAND II

Experiment 21 - RS Latch with NAND and Inverted Inputs

Consider the circuit shown. Using a C-MOS4069 you invert the inputs R and S ...

Circuit diagram RS latch with NAND gates and inverted inputs.

Circuit RS latch with NAND gates and inverted inputs. (Enlarge)

You realize easily that now you got back the truth table of a RS latch...

Note: Also the inputs R and S are interchanged. However, this has no practical consequences

R S Q Q'
0 0 stored
0 1 1 0
1 0 0 1
1 1 not defined

Truth table RS latch with NAND gates and inverted inputs.

RS Latch

A RS latch with NAND gates has a negative logic. The inputs are inverted in relation to the RS latch with NOR gates.

In the next experiments you build a DE latch with NAND gates...

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