ZHCSOE4B December 2022 – September 2024 TLV1851 , TLV1852 , TLV1854 , TLV1861 , TLV1862 , TLV1864
PRODMIX
The TLV186x 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 40V, independent of the comparator supply voltage (V+). 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 less than 100uA to optimize VOL logic levels. Lower pull-up resistor values will help increase the rising edge risetime, but at the expense of increasing VOL and higher power dissipation. The risetime will be dependent on the time constant of the total pull-up resistance and total load capacitance. Large value pull-up resistors (>1MΩ) will create an exponential rising edge due to the output RC time constant and increase the risetime.
Directly shorting the output to (V+) can result in thermal runaway and eventual device destruction at high (>12V) pull-up voltages. If output shorts are possible, a series current limitng resistor is recommended to limit the power dissipation.
Unused open drain outputs should be left floating, or can be tied to the (V-) pin if floating pins are not desired.