The maximum operating frequency of the 74HC14DB,112 is 100 MHz.
Yes, the 74HC14DB,112 is compatible with 5V systems, but it's recommended to use a voltage regulator to ensure a stable 5V supply.
To prevent oscillation, ensure that the input signals have a fast rise and fall time (>10 ns) and are not slowly changing. Also, use a pull-up or pull-down resistor to define the input state when the input signal is not present.
A simple POR circuit can be implemented using a resistor, capacitor, and diode. The capacitor should be charged to the supply voltage through the resistor, and the diode should be used to discharge the capacitor when the power is turned off.
Yes, the 74HC14DB,112 can be used as a simple inverter or buffer by connecting the input to the output through a resistor. However, this is not a recommended use case, as the device is designed for Schmitt trigger applications.