The maximum operating frequency of the 74HC175PW,118 is 100 MHz.
Yes, the 74HC175PW,118 is compatible with 3.3V systems, but it can also operate at 5V. However, the output voltage will be limited to the supply voltage (VCC).
Unused inputs should be tied to VCC or GND to prevent floating inputs, which can cause unpredictable behavior. It's recommended to tie them to GND to minimize power consumption.
The propagation delay of the 74HC175PW,118 is typically around 10-15 ns, but it can vary depending on the operating frequency, temperature, and supply voltage.
The 74HC175PW,118 is rated for operation up to 125°C, but it's recommended to derate the device for high-temperature applications. Consult the datasheet for specific derating guidelines.