The LM139 series consists of four independent precision voltage comparators, with an offset voltage specification as low as 2.0 mV
max for each comparator, which were designed specifically to
operate from a single power supply over a wide range of voltages.
Operation from split power supplies is also possible and the low
power supply current drain is independent of the magnitude of the
power supply voltage. These comparators also have a unique
characteristic in that the input common-mode voltage range includes
ground, even though they are operated from a single power supply