Comparators like the LM319 (LM311, ...) would be better called "uncommitted transistor output". Like the TL494 outputs, if you're familiar with it. You can use it for pull-up (OUT to +V, output from "GND") or pull-down (normal), or whatever your imagination can come up with.
Other ones, made for specific logic levels (LM360, TTL level, comes to mind), may be more particular about voltages. In the latter case, for example, obviously you need the analog supplies to be more than the analog input voltages (so you could do +/-5V for a [-3, 3V] range, say), and the output has to be referenced to whatever it connects to (i.e., +5V and GND, or insert-logic-level-here). Consider: TTL, CMOS, LVDS, ECL...
Tim
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+Vin, -Vin, and GND pins... but from looking at the datasheets it doesn't look like they can output their negative rail... am I right about this? if i am, then what's the point of the -Vin input?
I was looking at the LT1011
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and the LM319
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much thanks!