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:
Mar. 22, 2011
Akira Umezawa, Tokyo, JP;
Noriyasu Kumazaki, Kawasaki, JP;
Daisuke Arizono, Yokohama, JP;
Mami Kakoi, Yokohama, JP;
Akira Umezawa, Tokyo, JP;
Noriyasu Kumazaki, Kawasaki, JP;
Daisuke Arizono, Yokohama, JP;
Mami Kakoi, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A semiconductor storage device according to an embodiment includes multiple memory cells which electrically rewrite data, a well control circuit which outputs an erasure voltage to be applied to a well through an output terminal, a first pump circuit which outputs a voltage set by boosting an input voltage to the output terminal, a second pump circuit which outputs a voltage set by boosting the input voltage to the output terminal and outputs a voltage higher than an output voltage of the first pump circuit, a pump switching detecting circuit which outputs an assist signal to perform a boosting operation on at least one of the first pump circuit and the second pump circuit and an erase pulse control circuit which sets target voltages of the first pump circuit and the second pump circuit, on the basis of setting values to set a target voltage of the erasure voltage.