Do the inputs of the 74HC374-SMD D-type flip flop have high impedance inputs? In datasheet is stated that it has buffered inputs, I assume that means high impedance, right?
In other words, do I have to put resistors in the input pins?
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With the 74HC series and other logic families that include a large number of devices rather than the individual datasheets repeating the basic characteristics of the logic family normally the manufacturers publish some form of family guide. For example from NXP Semiconductor:
Page 28 shows some more detailed information on the inputs of the 74HC series and mentions a current flow of only a few nA. There's also the host of other information you might be used to seeing in a complete datasheet.
The D Inputs of a 74HC374 are extremely high impedance.