Patent ID: 7376036
Filing Date: 2008-05-20
Classification: G01R

Abstract:
1. A method for testing whether or not a fuse on a semiconductor substrate is disconnected, comprising: performing a first test operation upon said fuse by determining whether or not a resistance value of said fuse is larger than a first threshold resistance value; and performing a second test operation upon said fuse by determining whether or not a resistance value of said fuse is larger than a second threshold resistance value smaller than said first threshold resistance value, after said first test operation is performed, wherein said fuse is connected in series to a resistive element formed on said semiconductor substrate, said first test operation performing comprising applying a first difference in potential between a series of said fuse and said resistive element; and said second test operation performing comprising applying a second difference in potential between a series of said fuse and said resistive element, said second difference in potential being different from said first difference in potential.