A level shifter includes a latch supplied at a first voltage, and first and second series connections of first and second switch elements and first and second biased elements in series with first and second branches of the latch respectively. Third and fourth switch elements are connected in parallel with the first and second series connections respectively. The input signal, at a voltage different from the first voltage, activates the third or fourth switch element during a transition period after a change of state of the input signal one way or the other to change the state of the latch, and deactivates the third or fourth switch element and activates the first or second switch element to maintain the state of the latch during a stabilization period following the transition period. The transition periods are shortened, reducing current consumption and transfer delay times.