The maximum operating frequency of the SN74HC21PWR is 25 MHz.
Yes, the SN74HC21PWR is compatible with 5V systems, but it's recommended to use a voltage regulator to ensure a stable 5V supply.
It's recommended to follow a controlled power-up and power-down sequence to prevent damage to the device. Consult the datasheet for specific guidelines.
The maximum current rating for the SN74HC21PWR is 50 mA per output pin.
The SN74HC21PWR is rated for operation up to 85°C. However, it's recommended to derate the device for high-temperature applications.