Patent ID: 7038521

Claim:
A plurality of integrated circuit chips in communication with each other, said communication operative in a first voltage domain, at least one of said integrated circuit chips comprising: core logic operative in a second voltage domain, said second voltage domain different than said first voltage domain; and a voltage level shifting circuit coupled to said core logic and operative to receive communications from others of said integrated circuit chips and to output signals to said core logic, said voltage level shifting circuit comprising: an output; a first transistor operative to provide a high voltage at said output when conducting, said first transistor coupled to a first voltage; a second transistor operative to provide a low voltage at said output when conducting, said second transistor coupled to said first transistor and to a second voltage, said second voltage lower than said first voltage, said second transistor larger in size than said first transistor; and a third transistor coupled in parallel with said first transistor, said third transistor coupled to said first voltage and to a node between said first and second transistors, said third transistor larger in size than each of said first and second transistors.