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:
May. 18, 2004
Filed:
Jun. 25, 2002
Kazutomo Shioyama, Sakai, JP;
Sharp Kabushiki Kaisha, Abeno-ku, JP;
Abstract
A nonvolatile semiconductor storage device, comprising: a plurality of memory blocks, and at least one high voltage generation circuit, wherein the high voltage generation circuit is formed by a plurality of stages of basic pump cells, each basic pump cell including, a voltage increasing capacitor, an equalizing transistor connected to a voltage of a previous basic pump cell stage, a capacitor for increasing a voltage at a gate of the equalizing transistor, and a transistor which connects the voltage of the previous basic pump cell stage to the gate of the equalizing transistor, the nonvolatile semiconductor storage device further comprises, a discharge circuit connected to a node in the high-voltage generation circuit which has a high voltage, for discharging the node to a potential equal to or lower than a power supply voltage when the high-voltage generation circuit is stopped, and a control circuit for controlling the discharge circuit.