NIRQ is a interrupt error ouput with latched behavior, if a monitored voltage falls or rises outside of the programmed OVHF and UVHF thresholds NIRQ is asserted. NIRQ remains in its low state until the action causing the fault is no longer present and a 1-to-clear is written to the bit signaling the fault. Un-mapping NIRQ from a fault reporting register does not de-assert the NIRQ signal. NIRQ is In a typical TPS389006/08-Q1,TPS389R0-Q1 application, the NIRQ output is connected to a reset or enable input of a processor [such as a digital signal processor (DSP) or application-specific integrated circuit (ASIC), or other processor type].

The TPS389006/08-Q1,TPS389R0-Q1 has an open drain active low output that requires a pull-up resistor to hold these lines high to the required voltage logic. Connect the pull-up resistor to the proper voltage rail to enable the output to be connected to other devices at the correct interface voltage levels. The pull-up resistor value is determined by V_OL, output capacitive loading, and output leakage current. These values are specified in Section 6. The open drain output can be connected as a wired-OR logic with other open drain signals such as another TPS389006/08-Q1,TPS389R0-Q1 NIRQ pin.