DS1338C-33 datasheet by Maxim Integrated Products

DS1338C-33 Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the DS1338C-33?
  The recommended power-up sequence is to apply VCC first, followed by VBAT. This ensures that the internal oscillator is stabilized before the RTC starts counting.
• How do I ensure that the DS1338C-33 retains its clock data during power-down?
  To ensure that the DS1338C-33 retains its clock data during power-down, connect a battery to the VBAT pin. The internal capacitor will keep the RTC running for a short period of time, allowing the clock data to be retained.
• What is the maximum frequency for the external clock input on the DS1338C-33?
  The maximum frequency for the external clock input on the DS1338C-33 is 1.024MHz. Frequencies above this may cause the RTC to malfunction.
• Can I use the DS1338C-33 in a 5V system?
  No, the DS1338C-33 is designed to operate at 3.3V or 3.0V. Operating the device at 5V may cause damage or malfunction.
• How do I reset the DS1338C-33 to its default state?
  To reset the DS1338C-33 to its default state, apply a low pulse to the RST pin. This will reset the RTC to its default state, clearing all registers and counters.