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74ALVC164245输入端串入100欧姆的电阻之后无法被拉到低电平

我在74ALVC164245输入端串入了100欧姆电阻 ,然后发现即使直接把电阻接到地上,164245的输入管脚也无法被拉到低电平,在vcc=5v的情况下大约在2.8v左右,如果不接这个输入电阻,那么可以把输入管脚拉到低电平,为什么会出现这种情况,它的等效输入电路是啥样的?

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