If the differential input voltage (V_IN+ – V_IN–) times gain (plus V_REF for INA2191) exceeds the voltage swing specification, the INAx191 drives the output as close as possible to the positive supply or ground, and does not provide accurate measurement of the differential input voltage. If this input overload occurs during normal circuit operation, then reduce the value of the shunt resistor or use a lower-gain version with the chosen sense resistor to avoid this mode of operation. If a differential overload occurs in a fault event, then the output of the INAx191 returns to the expected value approximately 40 µs after the fault condition is removed. When the differential voltage exceeds approximately 300 mV, the differential input impedance reduces to 3.3 kΩ, and results in a rapid increase in bias currents as the differential voltage increases. A 3.3-kΩ resistance exists between IN+ and IN– during a differential overload condition; therefore, currents flowing into the IN+ pin flow out of the IN– pin. An increase in bias currents during a input differential overload occurs even with the device is powered down. Input differential overloads less than the absolute maximum voltage rating do not damage the device or result in an output inversion.