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When operating properly with 5V VCC (for example), /RESET will also be about 5V. When VCC starts to fall, /RESET will follow it down as shown. When VCC drops below VTH, /RESET drops to ground (issues a RESET) and stays there unless VCC also falls below its minimum operating voltage, approx. 1V. At this point, the supervisor loses control, and its output may rise, only to again follow VCC down to the ground.
Source Current Sink Current VID Input Threshold VID Pull-up Resistors Regulation Detect Comparator Input Offset Regulation Detect to EAOUT Delay BBFB to FB Bias Current Ratio VID 11111x Blanking Delay VID Step Down Detect Blanking Time VID Down BB Clamp Voltage VID Down BB Clamp Current Error Amplifier Input Offset Voltage