Construct 2:4 Decoder circuit with the help of IC74139 (74xx139)

ericgibbs

Joined Jan 29, 2010
18,766
hi,
It is inverted logic, so when the Address is 0,0,0 the I0 is 0.
Address 0, 0, 1 then I1 = 0
0,1,0 then I2 =0
This is common in logic IC's, their outputs are often used to Enable other IC's whose Enable pins require a Low enable signal.

E
 
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