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:
Mar. 08, 1994
Filed:
Feb. 14, 1992
Minoru Nizaka, Kanagawa, JP;
NEC Corporation, Tokyo, JP;
Abstract
A write-in voltage source is incorporated in an electrically erasable read only memory device for supplying a write-in voltage level to memory circuits of a redundant unit as well as a data storage, and comprises a first control circuit responsive to a first instruction signal indicative of a power voltage level or a write-in voltage level and producing first and second control signals complementary to each other, a second control circuit responsive to a second instruction signal indicative of a ground voltage level and producing third and fourth control signals complementary to each other, a first level-shifting circuit responsive to the first to third control signals and producing one of the write-in voltage level, the power voltage level and the ground voltage level, and a second level-shifting circuit responsive to the first, second, and fourth control signals and producing one of the write-in voltage level, the power voltage level and the ground voltage level so that the first and second level-shifting circuits independently supply the designated voltage levels to the memory circuits and the data storage.