What is electronic migration?
• Answer :In an integrated circuit (IC), many elements are integrated on a small die and they are connected by wiring. The number of interconnects increases and high current flows to cross sections of small interconnects. Electric conduction occurs in a metal when an electron move in substance. An moving electron collides with atoms of interconnect metal repeatedly. This collision is repeated many times and usually biased in one direction, so atoms move a little by a little. This movement is uneven, so a part of interconnects bores. When a part of interconnects bores, the current density of the continuous part increases to accelerate atom movement. Finally, a disconnection occurs. This is called electronic migration. The life till a disconnection occurs depends on the type of metal, interconnect formation method, and interconnect surface status. For aluminum interconnect, design it so that current of 10^5 (A/cm2) or higher does not flow. The current value of the microcomputer is define
