The LMV331, LMV393 and LMV339 consists of a PNP input, whose Vbe creates a limit on the input common mode voltage capability, allowing LMV33x to accurately function from ground to V_CC–Vbe(~700mV) differential input. This enables much head room for modern day supplies of 3.3 V and 5.0 V.

The output consists of an open drain NPN (pull-down or low side) transistor. The output NPN will sink current when the positive input voltage is higher than the negative input voltage and the offset voltage. The V_OL is resistive and will scale with the output current. Please see Figure 6-3 for V_OL values with respect to the output current.