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. 02, 2000
Filed:
Dec. 23, 1998
Hiromi Nobukata, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A nonvolatile semiconductor memory device having a memory cell in which an amount of charge stored in a charge storage unit changes according to a voltage supplied to a word line and a bit line, a threshold voltage changes according to that change, and data of a value according to the threshold voltage is stored, and writing trinary or more multi-bit data into memory cells in units of pages, provided with a precharging means for precharging all bit lines to a predetermined voltage before the write operation and a write control circuit having a latch circuit by which the write data is latched, making the bit line selected in accordance with an address discharge in accordance with the latch data, and performing write operations in parallel.