Patent ID: 8022727

Claim:
An integrated circuit comprising: a first voltage island; and a second voltage island to which power is capable of being switched off in a power-off period and switched on in a power reset period; a clamp having: an output configured to provide an output signal to the first voltage island; an input configured to receive a clamp in signal from the second voltage island; an input configured to receive a clamp enable signal; an input configured to receive a reset-an signal indicative of the power reset period; a latch operable to store a value of the clamp in signal; and a NOR gate having as inputs the clamp enable signal and the reset-an signal and providing as an output an enable signal to the latch; wherein the latch is operable to clamp the output signal to the stored value in response to the clamp enable signal, in order to protect the first voltage island from a non-stabilized input signal.