I'm using your LM239A-EP part in a design. I'm using three out of the four comparators. How do I terminate the unused comparator?
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Tie the inputs to different voltages, and leave the output open. See section 5.1.2 of the Application Design Guidelines for LM339, LM393, TL331 Family Comparators. (Those 10 kΩ resistors are necessary only if GND can have a higher voltage than an input at any time.)