Patent ID: 7511550
Filing Date: 2009-03-31
Classification: H01L,H03K

Abstract:
1. An integrated circuit, comprising: at least first and second circuit blocks; at least first and second power domains, the first circuit block being connected to the first power domain and the second circuit block being connected to the second power domain; at least one control circuit configured to generate at least first and second control signals, the first control signal being operative to selectively connect the first power domain to a first voltage supply, the second control signal being operative to selectively connect the second power domain to a second voltage supply, the first and second control signals being generated independently of one another; and at least first and second clamp circuits, the first clamp circuit being connected to the first power domain, the second clamp circuit being connected to the second power domain, wherein each of the first and second clamp circuits is operative to prevent a voltage on its corresponding power domain from rising above a prescribed voltage level for the corresponding power domain.