SN74HC21DRE4 datasheet by Texas Instruments

SN74HC21DRE4 Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the SN74HC21DRE4?
  The recommended operating voltage range for the SN74HC21DRE4 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 is recommended to tie them to a valid logic level (either VCC or GND) to prevent them from floating and causing unwanted behavior.
• What is the maximum frequency of operation for the SN74HC21DRE4?
  The maximum frequency of operation for the SN74HC21DRE4 is typically around 25 MHz, but this can vary depending on the specific application and operating conditions.
• How do I ensure that the output signals are not distorted or attenuated?
  To ensure that the output signals are not distorted or attenuated, it is recommended to use a suitable load impedance and to keep the output traces as short as possible to minimize signal degradation.
• Can I use the SN74HC21DRE4 in a 3.3V system?
  Yes, the SN74HC21DRE4 can be used in a 3.3V system, but the output voltage levels may not be as high as those in a 5V system. Additionally, the device may not be able to drive as much current at 3.3V as it can at 5V.