The LM211DT is a Dual Comparator, an analog circuit from STMicroelectronics. It is designed for general-purpose applications and is a dual version of the LM111 and is suitable for use in the comparison of two input voltages that can range from -2V to +13.2V. This IC features low input current, rail-to-rail inputs, internal hysteresis, low power consumption, and a wide range of supply voltage from 10V to 32V. The dual comparator outputs, open-collectors, can be connected to each other and, if a pull-up resistor is provided, the output can be used as an emitter-follower. The output is also Schmitt triggered, meaning that it will be able to provide hysteresis and noise immunity.