LM3 1 1 is a single voltage comparator. When the voltage at pin 3 is higher than that at pin 2, the output level is 0 V. Because it is an open-drain output, a resistor needs to be added. When the voltage of three pins is lower than the voltage of two pins, the output is positive at no load. 5.6 is adjustment, that is, balance.

The LM3 1 1 voltage comparator is designed to operate under a wider supply voltage: from a standard 15V operational amplifier to a 5V single supply for logic integrated circuits. Its output is compatible with RTL, DTL, TTL and MOS circuits. In addition, they can drive relays with switching voltage up to 50V and current up to 50mA.