The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2003
Filed:
May. 03, 2002
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a test operation for a semiconductor memory device, memory power supply lines are disconnected from a power supply node by using switch gates. Voltages of the memory power supply lines are detected using detection holding circuits. When the detected voltage is lower than a predetermined value, the corresponding memory power supply line is driven to a ground voltage level by the detection holding circuit. Thereby, a standby-current-defective but normally-operable memory cell is forced to an operation-defective state. Then, the standby-current-defective memory cell is identified, and redundancy replacement is performed thereon. Consequently, the standby current abnormality in the semiconductor memory device can be repaired.