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TXB0108的问题

Other Parts Discussed in Thread: TXB0108

请问TXB0108的datasheet上说没有用到的IO要接GND或电源,如下:The A and B sides of an unused data I/O pair must be held in the same state, i.e., both at VCCI or both at GND.请问这个有必要吗?我觉得没有用到的悬空就行了,为什么还要接成固定电平?