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

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ericgibbs

ericgibbs

Joined Jan 29, 2010
21,622
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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