The TLV4H290-SEP features an open-drain (also commonly called open collector) sinking-only output stage enabling the output logic levels to be pulled up to an external voltage from 0V up to 5.5V, independent of the comparator supply voltage (V_S). The open-drain output also allows logical OR'ing of multiple open drain outputs and logic level translation. TI recommends setting the pull-up resistor current to between 100uA and 1mA. Lower pull-up resistor values help increase the rising edge risetime, but at the expense of increasing V_OL and higher power dissipation. The risetime is dependent on the time constant of the total pull-up resistance and total load capacitance. Large value pull-up resistors (>1MΩ) create an exponential rising edge due to the RC time constant and increase the risetime.

Unused open drain outputs must be left floating, or can be tied to the V- pin if floating pins are not allowed. While an individual output can typically sink up to 125mA, the total combined current for all channels must be less than 200mA.