comparator
2 comparator chips — pinouts, specs, and datasheets.
LMV331
chip
LMV331 · Texas Instruments
The LMV331 is a low-voltage general-purpose comparator with inputs and outputs for comparing voltages, operating from 2.7V to 5V supply.
TL331
chip
TL331 · Texas Instruments
The TL331 is a single comparator with improved specifications such as lower input offset voltage and higher supply voltage capability.