Digital system with an output buffer with a switching current settable to load-independent constant values

摘要

A digital system comprises a digital data processing unit, at least one output buffer connected to the processing unit to generate output signals in response to digital signals arriving from the processing unit and at least one user unit connect as output buffer load. With a view to assuring that the switching current of the output buffer can be set to different values, the output buffer comprises means for fixing the switching current to a value that is substantially constant and independent of the load and means for selectively setting the value of the switching current and the processing unit comprises means for storing a predetermined parameter; said means are connected to the selective setting means for setting the values of the switching current as functions of the predetermined parameter.