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TXB0102 输出波形失真

Other Parts Discussed in Thread: TXB0102

如图所示,TXB0102的A2口输入波形为500kHz的方波信号,(VCCA为1.8V,VCCB为3.3V)

但是在B2口实测的波形如下所示,超过2V  的时候波形就失真了,是否为芯片问题,此时的测量已经是断开后面的负载了,即输出小于70pF

请教下怎么解决