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:
Nov. 17, 1987
Filed:
Mar. 15, 1985
Yoshihiro Takemae, Tokyo, JP;
Tomio Nakano, Kawasaki, JP;
Takeo Tatematsu, Yokohama, JP;
Junji Ogawa, Tokyo, JP;
Takashi Horii, Kawasaki, JP;
Yasuhiro Fujii, Yokohama, JP;
Masao Nakano, Kawasaki, JP;
Norihisa Tsuge, deceased, late of Kamakura, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A device connected between first and second voltage feed lines includes an information storing circuit having a fuse for storing information by blowing or not blowing the fuse, a voltage level conversion circuit connected to at least one of the first and second voltage feed lines and outputting a voltage lower than a voltage between the first and second voltage feed lines to the information storing circuit, and a circuit connected between the first and second voltage feed lines, for outputting a detection signal in response to a voltage value at the fuse in the information storing circuit to which the voltage is applied from the voltage level conversion circuit and which voltage value is varied with the blown or unblown state of the fuse. In a normal operation, the voltage output from the voltage level conversion circuit can be set as low as possible to restrain electromigration caused at the vicinity of the blown portion of the fuse to which the voltage is applied, but higher than the threshold voltage of the information detection circuit.