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:
Feb. 21, 1984
Filed:
Mar. 18, 1981
Kenji Kaneko, Hachioji, JP;
Takahiro Okabe, Tokyo, JP;
Minoru Nagata, Kodaira, JP;
Yutaka Okada, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A logic circuit is provided which includes a plurality of basic circuits each of which has a pnp (or npn) transistor as a constant current load and at least one npn (or pnp) transistor each as a driver with a clamping Schottky diode. The base of the driver transistor is used as an input terminal and the collector thereof is used as an output terminal, for each basic circuit and the output terminal of the preceding stage basic circuit is coupled directly to the input terminal of the subsequent stage basic circuit. In order to prevent current hogging the load current supplied from the preceding stage constant current load transistor is set to operate the subsequent stage driver transistor in a saturation made when the subsequent stage driver transistor is in the ON state.