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. 15, 1998
Filed:
Jul. 19, 1995
Seiko Instruments Inc., , JP;
Abstract
An EEPROM operable at a reduced power source voltage comprises a decoder circuit for decoding input signals, a memory array for storing the decoded, a reading circuit for operating the decoder circuit and the memory array, and for reading out data stored in the memory array, and a writing circuit for operating the decoder circuit and the memory array, and for writing data to the memory array. The EEPROM is divided into a first circuit area comprising a plurality of first transistors driven by a first power source voltage, an absolute value of a threshold voltage of the first transistors in the first circuit area being within the range of approximately 0.3 V to 0.7 V, the first circuit area including at least the reading circuit, and a second circuit area comprising a plurality of second transistors driven by a second power source voltage, an absolute value of a threshold voltage of the second transistors in the second circuit area being within the range of approximately 0.7 V to 0.9 V, the second circuit area including at least the writing circuit.