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SN74LVC16T245: SN74LVC16T245信号质量数据率。

Part Number: SN74LVC16T245
Other Parts Discussed in Thread: SN74AVC8T245

使用SN74LVC16T245电平转换芯片时,数据方向A to B,VCCA供电1.8V,VCCB供电5V,脉宽60ns,测得信号质量如下如所示:

请问为什么高电压只有4.4V左右?宽的信号如下图所示:

上升时间这么长什么原因?

手册中写明可以支持200Mbps.