LOW VOLTAGE PROGRAMMABLE eFUSE WITH DIFFERENTIAL SENSING SCHEME

摘要

An electronic fuse structure is disclosed for integrated circuits that is programmable with low voltage and incorporates a differential sensing scheme. The programming step is performed at about 1.5 times Vdd while the sense operation is performed at Vdd, which limits the resistance variation through the electronic fuse caused by the sense operation. During the sense operation a gating transistor emulates the voltage drop across a fuse select transistor for the case of an intact fuse. A circuit and method for characterizing the resistance of the electronic fuse is also disclosed.