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. 14, 1992
Filed:
Aug. 09, 1990
Nobuaki Andoh, Hyogo, JP;
Kenji Kohda, Hyogo, JP;
Tsuyoshi Toyama, Hyogo, JP;
Kenji Noguchi, Hyogo, JP;
Shinichi Kobayashi, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a nonvolatile semiconductor device in which source metal interconnections for coupling to ground a source of a floating gate type memory transistor are commonly provided for each predetermined plurality of memory transistors, switching transistors are provided for each column for coupling to ground columns excluding the selected column when a single column is selected in response to an external column address. Each of the switching transistors operates in response to an inverted signal of an output of a column decoder. According to this structure, a variation in source potential of each memory transistor caused by the difference in source resistance associated with each of the memory transistors is reduced.