The recommended operating voltage range for STK22C48-NF25 is 4.5V to 5.5V, with a typical voltage of 5V.
The power-up sequence for STK22C48-NF25 is critical. It's recommended to power up VCC before applying any input signals, and to ensure that VCC reaches its minimum specified voltage before applying any input signals.
The maximum clock frequency supported by STK22C48-NF25 is 20 MHz.
A reliable reset circuit for STK22C48-NF25 can be implemented using a resistor-capacitor (RC) network connected to the RESET pin. The RC network should be designed to ensure that the reset signal is asserted for at least 10 ms to ensure a proper reset.
The NC pins on STK22C48-NF25 are not connected internally and should be left unconnected or tied to VCC or GND through a resistor to prevent noise coupling.