Method for interconnecting CMOS chip types

DETAILED DESCRIPTION I have provided a variable voltage driver circuit that is located off chip that produces a variable voltage output swing off of a single voltage power supply.
The driver circuit is logically configurable.
The method of interconnecting chips identifies a voltage requirement for a second chip to which a first chip is to be coupled, and the voltage requirement for the first chip which is to be coupled to said second chip.
The variable voltage driver circuit is activated to produce a voltage output swing off of a single voltage power supply meeting the voltage requirements of said first chip.
The variable voltage driver circuit is logically configured to select a single signal swing which provides a voltage meeting the voltage requirement for the second chip at an output pin of the variable voltage driver circuit.
The circuit improve a standard driver by providing a current path that redirects current back to a pre-driver stage.
The preferred embodiment illustrates an off chip driver circuit produces a variable voltage output swing of 2.
5 V and 1.
8 V off of a single 2.
5 V power supply.
Signal integrity is maintained through the ratio of device sizes in the feedback path and pre-driver.
These circuits therefore conform to standard I/O cell definitions and power grid topologies used in the art, and they also meet the same ESD protection schemes of standard drivers.
Not only can the circuit ease migratation between machines it allows various technology circuits to be used in a new generation of machines not contemplated by the original designs.
These and other improvements are set forth in the following detailed description.
For a better understanding of the invention with advantages and features, refer to the description and to the drawings.