Saturday, June 1, 2013

Turn S R Latch Using a NOR gates into NAND

Turn S R Latch Using a NOR gates into NAND

I have two questions. Is an SR Latch the same as an RS latch? I think it is.
I can't post a picture so second question will use Boolean Algebra. For me an SR Latch is
S NOR Q' = Q
R NOR Q  = Q'
I will represent Q' as P since Q' might be mistaken as NOT(Q).
S NOR P = Q
R NOR Q = P
If I want to turn it into a circuit using NAND gates only I turn it into
NOT(NOT(S)*NOT(P))
NOT(NOT(R)*NOT(Q))
When I build the circuit it seems that I have way too many NAND Gates. Random pictures online show that I only need 2 NAND gates. This does not make sense to me, specially if it can be built with 2 NORS then with Boolean algebra I should get 8 or 6 NANDS.

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