Input/output port circuit and chip thereof

A chip, comprising:

• an input/output port circuit, comprising:
• an input/output pad;
• a transistor, having a first connection terminal and a second connection terminal, wherein the first connection terminal is electrically connected to the input/output pad through a conductive connection wire, and the second connection terminal is electrically connected to another transistor;
• and
• a conductive routing wire, electrically connected to the first connection terminal of the transistor, wherein the conductive routing wire is configured to provide a serial resistance such that, when a surge current is inputted into the input/output port circuit through the input/output pad, a resistance value of the serial resistance increases with temperature, thereby forcing the surge current to be diverted toward the another transistor,
• wherein in a layout of the input/output port circuit, the conductive routing wire comprises a first connection segment, a routing segment, and a second connection segment sequentially connected to each other, and the routing segment is configured substantially corresponding to an outmost periphery of a layout of the first connection terminal of the transistor,
• wherein the routing segment comprises a first routing portion, a second routing portion, a third routing portion, a fourth routing portion, and a fifth routing portion sequentially connected to each other, an extension direction of the second routing portion and the fourth routing portion is a Y axis of a layout substrate, an extension direction of the first routing portion, the third routing portion, and the fifth routing portion is an X axis of the layout substrate, and the first routing portion and the fifth routing portion are located on the same extension line, and
• wherein the resistance value of the conductive routing wire is at least greater than several tens of ohms.