Abstract
An electrical test method is proposed for detecting an open defect occurring at a data bus of a 3D SRAM IC. Targeted defects are a hard open defect and a soft one in a data bus. The test method is based on supply current of the IC. There is no need to add a circuit for the test method to an original circuit. Feasibility of the tests is examined by some experiments for a circuit made of an SRAM IC on a printed circuit board. The experimental results show us that resistive open defects whose resistance is greater than 300Ω can be detected by the test method.
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