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SN65HVD3088E: sn65hvd3088 AB线的上下拉电阻计算方法

Part Number: SN65HVD3088E

一般的485芯片有输入阻抗和内部上下拉的值,但是sn65hvd3088这个芯片没看到这个参数,不知道如何计算外部AB线上的上下拉电阻值