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SN74TVC3010低电平被拉高

Other Parts Discussed in Thread: SN74TVC3010

你好,

请教两个问题,我用SN74TVC3010按照PDF的说明,在5V输出端接了一个150欧电阻,结果5V输入信号(方波信号)直接被拉成高电平;换成1K电阻,结果5V输入信号和3.3V输出信号的GND都被拉高了,GND在1V的位置上,好像信号的GND浮空一样。

请问怎样把输入输出信号的低电平拉低到正常位置?  

还有如果不加上拉电阻,怎么设计电路使3.3V输入 5V输出?

亟待回复,谢谢。