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想用2个并口转串口的扩展方案

您好!

我想用2个一样的并口转串口芯片,8位的,这2个并口芯片可以在板子上用5V或者3.3V供电,但其中一块芯片的并口8个引脚输入0和5V的电平,另一块芯片输入0和3.3V的电平,然后数据输出的话就只是0和3.3V的电平给控制端。

不确定VCC如果是3.3V,给0-5V的输入电平,不知道对输出的电平会不会有影响

谢谢!