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. 30, 1999
Filed:
Aug. 25, 1997
Denso Corporation, Kariya, JP;
Abstract
An IC which integrates an EPROM is disposed on a circuit board. Also, a pad for supplying a writing voltage to the EPROM and a voltage supplying circuit, for supplying a power voltage to power terminals of the IC, which includes a first transistor and a second transistor, are disposed on the circuit board. When the pad is supplied with a high voltage for writing the data in the EPROM, the first transistor is on, the second transistor is off, and the voltage is supplied to the EPROM as the writing voltage. When data are read from the EPROM after the circuit board is packaged, because the pad is not supplied with any voltage, the first transistor is off, the second transistor is on, and a reading voltage is supplied to the EPROM via the outer terminal.