Integrated comparators plus reference ICs save space and cost! Maxim offers a variety of comparators plus precision references for over-/undervoltage monitoring, window detection, and other applications.
MAX9117, MAX9118 1.8V, 600nA ICC with Reference, Beyond-the-Rails Comparators
MAX9017, MAX9018 1.8V, Low VOS, 1.2µA ICC Comparators with Reference