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. 18, 1983
Filed:
Dec. 04, 1981
Applicant:
Inventor:
Yasunori Kanai, Inagi, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
307455 ; 307443 ; 324 / ;
Abstract
An ECL integrated circuit comprises an emitter-follower transistor at the output stage and a pull-down resistor connected to the emitter-follower transistor. The ECL integrated circuit is provided with a test circuit on a line extending from the output of emitter-follower transistor to a subsequent stage so as to cause a test current to flow only at the time of the test. The test current is smaller than the current usually flowing to the pull-down resistor but larger than the current flowing to the subsequent stage.