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使用SN74lvth245a目的是什么?该芯片有何功能作用?基础较差,看英文手册没怎么看懂,求指点。

如原理图,为什么RS-422总线要经过这个收发器?

该款收发器与SN74lvc4t245等电平转换器有什么区别?