The maximum frequency of operation for the SN74HC27N is 25 MHz.
Yes, the SN74HC27N is compatible with 5V systems, but it can also operate at lower voltages down to 2V.
The output enable (OE) pin is active-low, meaning that the outputs are enabled when OE is low (connected to GND) and disabled when OE is high (connected to VCC).
The propagation delay of the SN74HC27N is typically around 10-15 ns, but this can vary depending on the operating conditions and load capacitance.
Yes, the SN74HC27N is compatible with 3.3V systems, but the output voltage levels may not be as high as in a 5V system.