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现在有2路RS232，但是接口只有1路可以引出，需要可配置切换哪一路作为输出，TI有用于此应用的多路复用器芯片么？
考虑到RS232接收的电平范围为+-25V，可以看下TI的CD405x系列，供电电压能达到18V。
