Comparators with wired-OR outputs

DickCappels

Joined Aug 21, 2008
7,722
Maybe this is a good time to show us your circuit so we can try to tell if there could be some sort of problems. If two outputs are connected and one comparator wants its output to go low, they will both go low because in a conventional application there is no active pull-up circuit, only that one resistor.
 
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Alec_t

Joined Sep 17, 2013
12,206
can you please elaborate on this ?
If either comparator A output goes low OR comparator B output goes low then, since the outputs are connected, the output C of the combination is low. The resistor is the only thing which can pull the output high.
As AlbertHall pointed out, and MrChips clarified, in positive Boolean logic this is an AND function :- C=A.B.
In negative logic this can be re-written as not-C = not-A OR not-B.
 
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