LM239D STMicroelectronics, Quad Comparator, CMOS/TTL O/P, O/P, 300ns 2 → 36 V 14-Pin SO14

The STMicroelectronics Low power quad voltage comparator consists of four independent precision voltage comparators. Each comparator has been designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible. These comparators also have a unique characteristic in that the input common mode voltage range includes ground even though operated from a single power supply voltage.

Input common mode voltage range includes ground
Low output saturation voltage
Differential input voltage range equal to the supply voltage