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求助FPGA与DB9的控制线相连接的电平转换芯片

您好,

我想把DB9的控制引脚接到FPGA上,以方便更多应用。然而FPGA的控制线电平好像是-3到-15V为0,3到15V为1,在-3到3V是一个无意义的状态。是否是这样?请问有什么芯片能够做电平转换,方便我的使用?

谢谢