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:
Oct. 01, 1996
Filed:
Oct. 12, 1993
Applicant:
Inventors:
Yoshihiro Tada, Kyoto, JP;
Hiromi Uenoyama, Kyoto, JP;
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365201 ; 36518509 ; 36518911 ;
Abstract
A sense circuit includes a sense amplifier and a pull-up resistor circuit disposed on the input side of the sense amplifier. In response to a test selection signal, a read voltage applying circuit applies an external voltage to a selected memory cell and the total resistance of the resistor circuit is switched from a normal resistance to a smaller resistance for testing. Since the input side of the sense amplifier is pulled up through the resistor circuit with the resistance for testing, it is possible to detect the storage state of the selected memory cell under a stricter condition.