CD4021BF3A datasheet by Texas Instruments

CD4021BF3A Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the CD4021BF3A can handle?
  The CD4021BF3A can handle clock frequencies up to 10 MHz, but it's recommended to operate it at a frequency below 5 MHz for reliable operation.
• How do I ensure that the CD4021BF3A is properly powered and decoupled?
  To ensure proper operation, power the CD4021BF3A with a stable 5V supply, and decouple the power pins with 0.1uF ceramic capacitors. Additionally, use a 10uF electrolytic capacitor to filter out any noise on the power line.
• What is the maximum input voltage that the CD4021BF3A can handle?
  The CD4021BF3A can handle input voltages up to 15V, but it's recommended to keep the input voltage below 5.5V to ensure reliable operation and prevent damage to the device.
• How do I interface the CD4021BF3A with a microcontroller?
  The CD4021BF3A can be interfaced with a microcontroller using a serial interface. Connect the clock input (CLK) to a microcontroller pin, and the data input (D) to another microcontroller pin. Use the microcontroller to generate a clock signal and send data to the CD4021BF3A.
• What is the purpose of the Q7-Q0 pins on the CD4021BF3A?
  The Q7-Q0 pins are the parallel output pins of the CD4021BF3A. They provide the stored data in parallel format, allowing the microcontroller to read the data directly.