M74HC21B1R datasheet by STMicroelectronics

M74HC21B1R Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the M74HC21B1R?
  The recommended operating voltage range for the M74HC21B1R is 2V to 6V, with a typical operating voltage of 5V.
• How do I handle the input pins when they are not in use?
  When the input pins are not in use, it's recommended to tie them to VCC or GND through a resistor to prevent floating inputs and reduce power consumption.
• What is the maximum frequency of operation for the M74HC21B1R?
  The maximum frequency of operation for the M74HC21B1R is typically around 30MHz, but this can vary depending on the specific application and operating conditions.
• Can I use the M74HC21B1R in a 3.3V system?
  Yes, the M74HC21B1R can be used in a 3.3V system, but the output voltage levels may not be as high as those in a 5V system. Ensure that the output voltage levels meet the requirements of the downstream devices.
• How do I reduce power consumption in the M74HC21B1R?
  To reduce power consumption in the M74HC21B1R, use a lower operating voltage, reduce the clock frequency, and minimize the number of transitions on the input pins.