关键词: IO端口, 宇航, ESD, 冷备份, 抗辐照

Abstract: An IO port is designed and implemented for aerospace environment. On the basis of the traditional IO structure, the IO is equipped with grid-controlled two-stage tube, clamp, BUS and other special structures. At the same time, the output drive structure is improved, so that the port can not only achieve normal data transmission function, but also meet the cold backup function, and it has certain ESD capability. The IO port has a certain anti-radiation property by using radiation hardened SOI circuit technology, and the total steady-state dose reached 100k rad(Si), which is proved to be suitable for space environment by the tape-out test, and the driving ability and ESD index all meet the design expectation. This paper has certain guiding significance to the port design of aerospace circuit.

Key words: IO port, aerospace, ESD, cold backup, radiation resistance