Patent ID: 8207754

Claim:
A system, comprising: an IO (input/output) buffer module that includes an IO cell module, the IO cell module including: an IO control logic circuit structured to generate output drive control signals on an output; a pre-driver having a level shifter with an input coupled to the output of the IO control logic circuit and having an output node formed with metal connectors; a PMOS driver and an NMOS driver having respective inputs coupled to the output of the pre-driver; and one or more IO adder modules that include metal connectors and a pre-driver structured to be coupled to the metal connectors of the cell module via the metal connectors on the pre-driver, the metal connectors on the pre-driver in the IO adder modules extend from the one or more IO adder modules at a same height as the metal connectors of the IO cell module, the IO cell module and one or more IO adder modules structured to be abutted together and operatively coupled to enable migration of the IO buffer module from one supply environment to the other.