Integrated circuit devices using fuse elements to generate an output signal that is independent of cut fuse remnants

Abstract

Integrated circuit devices include a comparator circuit and a fuse programmable input circuit. The fuse programmable input circuit generates first and second differential input signals at voltage levels that can be controlled through a pair of fuses. The comparator circuit generates an output signal based on the relative voltage levels exhibited by the first and second differential input signals. In particular, the output signal is driven to a first logic state when the voltage difference between the first and second differential input signals is positive and the output signal is driven to a second logic state, which is opposite the first logic state, when the voltage difference is negative. Because the comparator is responsive to the relative difference between the voltage levels of the first and second differential input signals and not the absolute magnitudes of the voltage levels, fuse remnants that may exist after the fuse programmable input circuit has been programmed (i.e., one or more fuses have been cut) typically do not affect the output signal.