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:
Apr. 18, 1995
Filed:
Apr. 30, 1993
Applicant:
Inventors:
Assignee:
Texas Instruments Incorporated, Dallas, TX (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
327108 ; 327170374 ; 326128 ; 326 56 ; 326 19 ;
Abstract
A TTL gate (26) with a Darlington output (14,14A,16) includes three circuits (28,30,32) to decrease the gate switching time during an output transition from a high to a low logic state and from a high impedance state to a low logic state. Each speedup circuit drives the gate input transistor (12) for a different length of time, ensuring that the lower output transistor (16) turns on rapidly and remains on until the output transition is complete. The circuits ensure, however, that the additional drive current (82) is time limited to avoid excessive power consumption.