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SN74LVC1G08输出与LMG1020相连时输出脉冲电压为0.8V,是什么原因?

Other Parts Discussed in Thread: SN74LVC1G08, LMG1020

SN74LVC1G08供电电压为5V,输入为两个3.3V的脉冲信号,如果后级与LMG1020断开,输出信号正常;如果不断开LMG1020且LMG1020正常工作,则SN74LVC1G08输出幅值为60mV;不断开LMG1020且LMG1020不上电工作,则SN74LVC1G08输出幅值为0.8V,这是什么原因引起的,请各位大神帮忙分析一下