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SN74AHC245: what is the input impedance of SN74AHC245QPWR

Part Number: SN74AHC245

What is the input impedance of SN74AHC245QPWR?  When I put an RC filter(100ohm+1nF) at the input. The high level and low level of input signal are 5V and 0V. But i can only see 4.1V after the resistor. So i am wondering if it is ok to add an RC filter at the input pin.