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. 09, 1988
Filed:
Nov. 21, 1986
Lal C Sood, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An integrated circuit has a plurality of outputs which switch to a valid condition at the same time. Because integrated circuits have leads for power supply terminals, there is inductance on these leads. When an output switches logic states, there is a change in current flow so that there is a voltage drop across the inductive lead which is used for power supply coupling. This voltage drop, expressed Ldi/dt, is proportional to the number of outputs which are switched. The worst case for the positive power supply terminal Ldi/dt is when all of the outputs switch from a logic low to a logic high. This worst case is reduced in half by predisposing half of the outputs to one logic state and the other half to the other logic state. This also reduces the worst case for the negative power supply terminal, frequently ground, in half which is the case when all of the outputs switch from a logic high to a logic low.