In order for TLVH431 to properly be used as a comparator, the logic output must be readable by the receiving logic device. This is accomplished by knowing the input high and low level threshold voltage levels, typically denoted by V_IH and V_IL.

As shown in GUID-48D7CED9-5F64-428A-99B3-F422301B14B8.html#SLVS5555185 and GUID-48D7CED9-5F64-428A-99B3-F422301B14B8.html#SLVS5554136, TLVH431's output low level voltage in open-loop/comparator mode is approximately 1 V, which is sufficient for some 3.3 V supplied logic. However, would not work for 2.5 V and 1.8 V supplied logic. To accommodate this a resistive divider can be tied to the output to attenuate the output voltage to a voltage legible to the receiving low voltage logic device.

TLVH431's output high voltage is approximately V_SUP due to TLVH431 being open-collector. If V_SUP is much higher than the receiving logic's maximum input voltage tolerance, the output must be attenuated to accommodate the outgoing logic's reliability.

When using a resistive divider on the output, be sure to make the sum of the resistive divider (R1 and R2 in GUID-22596AA7-A2D8-45AF-9824-F4E3978B05B0.html#SLVS5559672) is much greater than R_SUP in order to not interfere with TLVH431's ability to pull close to V_SUP when turning off.