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. 01, 1981
Filed:
Jun. 18, 1979
Applicant:
Inventor:
Robert N Allgood, Austin, TX (US);
Assignee:
Motorola Inc., Schaumburg, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
361100 ; 307304 ; 357 42 ;
Abstract
There is provided a reverse battery protection circuit which does not have current limiting resistors to limit current in all portions of the circuit. The protection is obtained by connecting the substrate tubs of N-channel drivers through another N-channel transistor to VSS. The another N-channel transistor has its gate electrode connected to voltage terminal VDD. Accordingly, when reverse voltage is applied to the circuit, VDD will be negative and therefore the another N-channel transistor will not be conductive. This prevents the output driver transistor from becoming a conductive parasitic bipolar transistor.