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. 09, 1989
Filed:
Mar. 05, 1987
Applicant:
Inventors:
Atsushi Suzuki, Kawasaki, JP;
Hideo Itoh, Yokohama, JP;
Assignee:
Fujitsu Limited, Kanagawa, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
36518906 ; 365190 ;
Abstract
A semiconductor memory device is provided with a clamp circuit for clamping a driving level of a write circuit so that the information on a bit line can be transmitted quickly to a data bus at the time of a read-out operation by using transistors having a low threshold value (or a large mutual conductance) for the transistors constituting a column transfer gate, and so that a write-in operation can be carried out at a high speed by using transistors having a large mutual conductance for driving transistors of the write circuit and setting a required level by clamping the driving level of the write circuit.