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, 1994
Filed:
Sep. 11, 1992
Shigeyuki Hayakawa, Yokohama, JP;
Leiichi Yanagisawa, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
The external power supply voltage applied to an external power supply terminal is supplied to an internal stepdown circuit and a switch circuit. The value of the external power supply voltage is detected by an external voltage detecting circuit, and if the value is greater than a predetermined value, the internal stepdown circuit operates, the external power supply voltage is stepped down by the internal stepdown circuit and supplied to an internal circuit as an internal power supply voltage. Alternatively, if the value of the external power supply voltage is smaller than the predetermined value, the internal stepdown circuit does not operate, and instead the switch circuit operates and the external power supply voltage is supplied via the switch circuit to the internal circuit as the internal power supply voltage.