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:
Sep. 13, 1988
Filed:
Aug. 28, 1985
Applicant:
Inventors:
Assignee:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ; G11C / ; G06F / ;
U.S. Cl.
CPC ...
365189 ; 365220 ; 365230 ; 365238 ; 364200 ;
Abstract
A memory device which employs multilevel memory cells has a basic arrangement in which a write device writes multilevel information corresponding to binary data of plural bits in the memory cells and a readout device outputs binary data of plural bits representing the multilevel information read out of the memory cells. The memory device includes a multilevel detector for detecting the information of the memory cells at one time and reference level generator for generating reference levels therefor, thereby permitting the reduction of the bit area of each memory cell and increased speed during the operation of the memory device.