The maximum clock frequency for CD74HCT166E is 30 MHz, but it can vary depending on the operating voltage and load capacitance. It's recommended to check the timing characteristics in the datasheet and perform simulations to ensure the desired frequency can be achieved.
To ensure proper power and decoupling, use a 5V power supply with a minimum of 10uF decoupling capacitor between VCC and GND, and place it as close to the device as possible. Additionally, use a 0.1uF decoupling capacitor between VCC and GND for each 10 inches of trace length.
The recommended input rise and fall time for CD74HCT166E is 10ns to 100ns. Faster rise and fall times can cause oscillations and affect the device's performance.
No, CD74HCT166E is a 5V device and is not compatible with 3.3V systems. Using it in a 3.3V system can cause damage to the device or affect its performance. If you need a 3.3V version, consider using the CD74ACT166E or CD74LVC166A instead.
The asynchronous reset input (MR) should be tied to VCC through a pull-up resistor (e.g., 1kΩ) to ensure it's not floating. When MR is low, the device is reset, and all outputs are cleared. When MR is high, the device operates normally.
CD74HCT166E datasheet
by Texas Instruments
