Browse Prior Art Database

Controlled Transition, Short Circuit Current Regulated Off Chip Driver

IP.com Disclosure Number: IPCOM000060826D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Tessitore, RJ Williams, GA [+details]

Abstract

A circuit that minimizes noise and ground bounce due to fast switching transitions of off chip drivers ("OCDs") by extending the duration of the switching time is constructed and operates as follows. LSI chip technology has advanced to the point where many input/ output circuits may be necessary for a single chip, many requiring OCDs. I/O connections require output and ground lands to permit the electrical interface connection. These lands however contain inductance which gives rise to transient voltage spikes in the ground produced by the di/dt during switching transitions. Particularly, when many OCDs switch simultaneously, the resultant ground voltage spike can be large enough to cause spurious switching in the chip.