a method of determining widths and / or routes of i / o power routes between one or more power distribution networks and a plurality of i / o circuits based on ir chop , electromigration , and electrostatic discharge electrical requirements . the method includes initially routing the i / o power routes and then iteratively analyzing the i / o power routes and iteratively incrementing the width of each power route that fails one or more of the electrical requirements until all power routes meet all electrical requirements . once all power routes meet the electrical requirements , power routing is performed again to re - route any power routes as necessary to accommodate their wider widths . the method may be implemented in a system that includes a power routing tool , an electrical analysis tool , and a tool integrator tat implements an integrated power routing algorithm .