SMIC 0.18um VCC Detector

The present IP is a VCC Detector (VDT) circuit. It detects the voltage level of its power supply, AV18. The normal operation voltage range of AV18 is 1.62v~1.98v. When the detected voltage AV18 increases beyond the detection level VR18, the corresponding output OUTP15 is generated as a high level logic. When the detected voltage AV18 decreases below the detection level VF18, the corresponding output OUTP15 is generated as a low level logic. This system consists of one comparator sub-circuit and needs an external bandgap. And the output may be in the wrong voltage level during the power-up phase before the bandgap becomes stable.

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