Patent ID: 7567112

Claim:
A voltage level shifter for converting an input signal into an output signal, comprising a first inverting module coupled between an input terminal and a first node for receiving an external signal and the input signal from the input terminal and providing a first signal at the first node; a second inverting module coupled between the first node and a second node for receiving the external signal and the input signal and providing the first signal at the first node; a first inverting protection circuit coupled between the first node and a third node for receiving the first signal and providing a second signal at the third node; a second inverting protection circuit coupled between the second node and a fourth node for receiving the input signal and providing a third signal at the fourth node; a latch circuit coupled between the third node and the fourth node for receiving the second signal and the third signal; and an output circuit receiving the second signal and outputting the output signal according to the second signal.