The recommended operating voltage range for STK14C88-NF45I is 2.7V to 3.6V.
The power-up sequence should be VCC first, then VIO. For power-down, the sequence should be VIO first, then VCC. This ensures that the internal voltage regulators are properly shut down.
The maximum clock frequency supported by STK14C88-NF45I is 133 MHz.
A reliable reset circuit can be implemented using a voltage supervisor IC, such as the CY1149, which can detect power-on reset, brown-out reset, and watchdog timer reset.
Key considerations for PCB layout and design include keeping the power and ground planes separate, using a solid ground plane, and minimizing signal trace lengths and impedance mismatches.