The simultaneous logic and IDDQ testing of CMOS ICs with mixed-mode testing facility for sequential circuits

This paper presents an approach to design and develop a VLSI system for the simultaneous logic and IDDQ testing of CMOS ICs with mixed-mode testing facility for sequential circuits. The work involves the design of an interfacing unit on PCB containing interfacing circuits for parallel data exchange between a test processor and a microcomputer. This allows IDDQ measurement for every vector used for logic testing, performing logic testing simultaneously, providing a promising IDDQ fault coverage and reducing substantially the time and cost of testing. Three basic test development strategies are considered. They are functional test development, structural test development and physical defect test development. Mixed-mode testing facility is adopted to enhance the performance and reduce the testing time.