HEF4021BP,652 datasheet by NXP Semiconductors

HEF4021BP,652 Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for HEF4021BP?
  The recommended operating voltage range for HEF4021BP is 3V to 15V, with a typical voltage of 5V.
• How do I handle the unused inputs of the HEF4021BP?
  Unused inputs of the HEF4021BP should be connected to VCC or GND to prevent them from floating and causing unwanted switching.
• What is the maximum clock frequency that the HEF4021BP can handle?
  The maximum clock frequency that the HEF4021BP can handle is 10 MHz, but this can vary depending on the specific application and operating conditions.
• Can I use the HEF4021BP in a 3.3V system?
  Yes, the HEF4021BP can be used in a 3.3V system, but the output voltage levels may not be as high as those in a 5V system, and the noise immunity may be reduced.
• How do I ensure that the HEF4021BP is properly powered on and off?
  To ensure proper power-on and power-off of the HEF4021BP, a power-on reset (POR) circuit should be used to reset the device during power-up, and a decoupling capacitor should be used to filter out noise on the power supply lines.