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:
Apr. 30, 2013
Filed:
Aug. 25, 2011
Hitoshi Shiga, Yokohama, JP;
Hitoshi Shiga, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
When performing a word line leak test to determine a leak state of the word lines, the control circuit applies, from the voltage control circuit to the word lines connected to the memory cell array written with test pattern data, voltages corresponding to the test pattern data. Thereafter, it switches the transfer transistors to a nonconductive state, thereby setting the word lines in a floating state. After a lapse of a certain time from switching of the transfer transistors to a nonconductive state, it activates the sense amplifier circuit to perform a read operation in the memory cell array. Then it compares a result of the read operation with an expectation value corresponding to the test pattern data.