Patent ID: 8854348

Claim:
A negative level shifter comprising: a voltage selection unit configured to apply one of (1) a first voltage to a first node and a second voltage to a second node and (2) a third voltage to the first node and a fourth voltage to the second node, in response to a control signal; and at least one voltage level conversion unit connected to the first node and the second node and configured to convert a voltage of an input signal based on a voltage of the first node and a voltage of the second node, wherein the at least one voltage level conversion unit includes, a first voltage level control unit configured to connect the first node with a third node and the second node with the third node in response to the input signal and a voltage of a fourth node, a second voltage level control unit configured to connect the first node with the fourth node and the second node with the fourth node in response to an inverted input signal and a voltage of the third node, and a latch unit configured to connect the third node or the fourth node to the first node if the control signal is changed from a first value to a second value.