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SN75LVCP601 芯片 differential impedance和Single-ended impedance疑问？

user5780423
Prodigy 60 points
Other Parts Discussed in Thread: SN75LVCP601

你好，看到SN75LVCP601定义了differential impedance（大于85Ω，小于122Ω，典型值100Ω）和Single-ended impedance（大于40Ω），我的疑问是，TX是差分信号，布线时肯定是按照差分阻抗进行设计，那Single-ended impedance的意义是什么呢？在什么情况下会用到这个Single-ended impedance？是说TX布差分线时，要满足differential impedance为100的同时，还要每根线的阻抗Single-ended impedance大于40Ω吗？