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SN65HVD75: RO端电平一直为高,无跳变

Part Number: SN65HVD75

HI 

我们在测试SN65HVD75DR接收器20Mhz的性能时,发现当AB端输入1.2Vpp的差分信号时,可见下图。SN65HVD75DRO端电平一直为高,无跳变,原理图见下文。

按手册真值表和电气参数看,应该能正常跳变。请帮忙分析。(其他补充:可以确认SN65HVD75D无损坏)