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:
Dec. 26, 1989
Filed:
May. 24, 1988
Applicant:
Inventors:
Fuminari Tanaka, Tokyo, JP;
Satoshi Nonaka, Tokyo, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; H03K / ; H03K / ;
U.S. Cl.
CPC ...
307443 ; 307542 ; 307572 ; 307242 ; 307605 ; 330264 ; 330295 ;
Abstract
An output circuit includes a plurality of output buffer circuits and a plurality of pre-buffer circuits connected to drive the output buffer circuits. Some of the pre-buffer circuits are each constituted by P- and N-channel MOS transistors having channel widths or channel lengths which are large enough to drive the output buffer circuits, and the remaining pre-buffer circuits are each constituted by P- and N-channel MOS transistors whose channel widths and channel lengths are so determined as to set the current driving ability thereof sufficiently smaller than that of the corresponding output buffer circuits.