Patent ID: 6822490
Filing Date: 2004-11-23
Classification: H03K

Abstract:
A data output circuit comprising:a first inversion unit receiving, at an input thereof, a first data signal of an operating voltage level and inverting the received first data signal to obtain, at an output thereof, a first inverted data signal; a first voltage compensation unit coupled to the output of the first inversion unit, that compensates for the voltage level of the first inverted data signal to obtain a first driving signal, when a first power supply voltage of an output voltage level is different from a second power supply voltage of the operating voltage level by at least a predetermined voltage level; a second inversion unit receiving, at an input thereof, a second data signal with the operating voltage level and inverting the received second data signal to obtain, at an output thereof, a second inverted data; a second voltage compensation unit coupled to the output of the second inversion unit, that compensates for the voltage level of the second inverted data signal to obtain a second driving signal, when the levels of the first and second power supply voltages are different by at least a predetermined voltage level; and a driver unit receiving the first and second driving signals and outputting an output data signal of a logic level that is opposite the logic levels of the first and second driving signals.