Patent ID: 6268744
Filing Date: 2001-07-31
Classification: H03K

Abstract:
A pre-buffer voltage level shifting circuit operative with an output buffer that alternately uses one of a plurality of different supply voltages as a buffer supply voltage comprising:a multi-supply voltage level shifting circuit, operatively responsive to a control signal and a data signal, including signal gate oxide devices operative to produce a variable pre-buffer output signal for the output buffer wherein the variable prebuffer output signal is controlled to have a level within gate degradation levels of the single gate oxide devices for each of different at least first, second and third buffer supply voltages, and wherein the multi-supply voltage level shifting circuit generates a first output signal and a second output signal; anda first circuit configured as a signal gate oxide cross coupled active load for the multi-supply voltage level shifting circuit operatively responsive to the first and second output signals and operatively coupled to the buffer supply voltage.