Patent ID: 7466167

Claim:
An electronic circuit comprising a digital communication conductor and a driver circuit with an output coupled to the digital communication conductor, for driving changes of a potential at the digital communication conductor to and from a digital signal level, the driver circuit comprising: a control circuit, arranged to generate selection signals that select increasingly stronger drive strengths and increasingly weaker drive strengths during changes to and from the digital level respectively; a controllable current supply circuit, with a current control input coupled to the control circuit for receiving the selection signals and a current supply output coupled to the digital communication conductor; a detector circuit with an input coupled to the digital communication conductor and an output coupled to the control circuit, and arranged to detect whether a potential at the digital communication conductor had reached a required range; wherein the control circuit is arranged to store information about the drive strength that was selected when the detector circuit indicated that the range was reached during the change to the digital level, and to select the stored drive strength as a first step during the change away from the digital level.