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SN65LVDS33: spi信号异常

Part Number: SN65LVDS33

做了一个SPI延长的简易DEMO

我通一个300k左右的开关信号测试,输出波形如图

通过SN65LVD31发送,SN65LVDS33接收

在100欧的负载电阻上测得的波形是正常的

但是SN65LVDS33芯片出来后波形低电平有异常如图