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TCA9800: B side 不需要上拉电阻,是什么原理

Part Number: TCA9800

最近在使用TCA9800,发现手册中有提到B side内部有一个电流源,所以不能有外部的上拉电阻,但是我理解外部加了pull up后只是会增大到device端的电流,并不会对TCA9800造成影响;
想请问下是因为外部加了上拉会影响芯片内部对是A side还是B side拉低电平的判断吗?请帮忙解释下这个原理,感谢