LM339 description and what to do with unused gates.
The input voltage range on 1 or both inputs is from -0.3 V to 36 V, independent of the supply voltage.
Input common mode range -0.3 V to VCC-1.5 V.
As long one input is within the common mode range, the output will have the correct state.
If an input is driven below -0.3 V, the current must be limited to < 50 mA.
The comparator should return to normal operation when the excess input current is removed, but I have seen some latch up.
The output can be driven to 36 V, independent of the supply voltage.
The output remains hi-z until the supply voltage reaches 1.5 V to 2 V ( at least on the one I tested ).
An unused comparators should be connected with both inputs on VCC and the output on GND for minimum supply current.
|IN+ level||IN- level||Output state||Output connected to||Supply current, 5V||Supply current, 30V|
|GND||GND||Unknown||Float||0.743 mA||0.869 mA|
|GND||GND||Unknown||GND||0.743 mA||0.872 mA|
|GND||VCC||GND||Float||0.741 mA||0.866 mA|
|GND||VCC||GND||GND||0.741 mA||0.868 mA|
|VCC||GND||Hi-z||Float||0.74 mA||0.866 mA|
|VCC||GND||Hi-z||GND||0.74 mA||0.866 mA|
|VCC||GND||Hi-z||VCC||0.74 mA||0.863 mA|
|VCC||VCC||Unknown||Float||0.685 mA||0.799 mA|
|VCC||VCC||Unknown||GND||0.685 mA||0.798 mA|
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