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:
May. 21, 1996
Filed:
Oct. 12, 1994
Applicant:
Inventors:
Assignee:
Sony Electronics, Inc., Park Ridge, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365201 ; 371 225 ; 371 226 ; 371 404 ; 365202 ;
Abstract
A test circuit for a single chip semiconductor memory array, located in the chip, enables testing of all columns along a word lines without additional column readout circuits. A pair of current detecting differential amplifiers are connected to the bit lines of multiple memory cells along a word line, and the amplifier outputs are compared to generate a pass/fail signal during a read access.