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:
Sep. 24, 1991
Filed:
May. 04, 1990
Applicant:
Inventor:
Michael E Wright, Berkeley, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; H03K / ; H03K / ;
U.S. Cl.
CPC ...
307455 ; 3072993 ; 307454 ; 307475 ; 3074821 ;
Abstract
Current mode logic configuration circuits are shown for use with linear integrated circuit chips. The circuits employ plural collector lateral transistors to provide logic current source outputs in response to logic current inputs that are accepted by NPN transistor current mirrors acting as current sinks. Conventional logic functions are detailed and a toggle flip-flop configuration is shown being composed of the basic logic gates. Since the disclosed current mode voltage swings are small the circuit speed is relatively high at a given shunt capacitance. Die surface area is low with many transistors sharing common n-epitaxial tubs.