The maximum operating frequency of the CD74HCT27M is 30 MHz, but it can vary depending on the specific application and operating conditions.
To ensure proper power sequencing, it is recommended to power up the VCC pin before the input signals, and power down the VCC pin after the input signals. This helps to prevent unwanted latch-up or damage to the device.
The recommended operating voltage range for the CD74HCT27M is 4.5V to 5.5V, but it can operate down to 4V with reduced performance.
Unused inputs on the CD74HCT27M should be tied to a valid logic level (either VCC or GND) to prevent unwanted switching and reduce power consumption.
The CD74HCT27M is a 5V device, but it can be used with 3.3V logic with proper level shifting or voltage translation. However, the device's performance may be affected at lower voltages.