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:
Feb. 13, 2001
Filed:
Apr. 11, 2000
Hiroshi Tomotani, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The semiconductor storage device of this invention includes a memory cell array; word lines; bit lines; a peripheral circuit for controlling the potentials of the word lines and the bit lines; a peripheral circuit power line for connecting a power voltage supply terminal to the peripheral circuit; a peripheral circuit power switch; a memory cell array power line; a constant voltage supply line for connecting the word lines to ground; a word line switch for fixing a voltage disposed on the constant voltage supply line; and the like. The potential of the word lines is fixed by controlling the word line switch to be placed in a conducting state before switching the peripheral circuit power switch. Thus, data in the memory cells can be prevented from being destroyed by a transient current caused in turning on/off the switch.