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SN74AVC16T245: 输入上拉电阻阻值确认

Part Number: SN74AVC16T245

 应用电路如图所示,按钮是一个物理按键,当上拉电阻是10K时,通过按钮拉低后,电平无法恢复到5V,测试只有1.2V左右。当上拉电阻为1K时,通过按钮拉低后,电平可以恢复到5V。请问这是什么原因?