Patent ID: 9515655
Filing Date: 2016-12-06
CPC Classification: H03K

Claim Text:
1. An integrated circuit comprising: (a) a functional input pin; (b) a first circuit block, operating at a first voltage, having a functional input directly connected to the functional input pin; (c) a second circuit block, operating at a second voltage different than the first voltage, having a functional input coupled to the functional input pin; (d) a first pass device having an input directly connected to the functional input pin, an output directly connected to the functional input of the second circuit block, and a control input, the first pass device selectively coupling the functional input pin to the second circuit block; (e) a first regulator circuit having a VREF input and a first regulated voltage output; and (f) a first control circuit having a regulated voltage input coupled to the first regulated voltage output, a drive output coupled to the control input of the first pass device, and an enable input.