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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.
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In reply to Dylan Hubbard:
Thank you for your reply.
I still don't understand the connection between RC filter and leakage specs you mentioned as well as input transition spec. can you give an example or explain more detail?
In reply to Yangbo:
Here are the specs I am talking about from the datasheet:
Input Transition rate
Thank, but it still can't explain the voltage drop on the 100 ohm resistor if the input impedance is high.
i know these two spes, what i want to learn from you is how the RC filter effect them. what will happen if i add a RC filter?
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