DS1338U-33 datasheet by Maxim Integrated Products

DS1338U-33 Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the DS1338U-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 DS1338U-33 retains its clock data during power-down?
  To ensure that the DS1338U-33 retains its clock data during power-down, connect a battery to the VBAT pin. This allows the internal oscillator to continue running, maintaining the clock data.
• What is the maximum frequency for the external clock input on the DS1338U-33?
  The maximum frequency for the external clock input on the DS1338U-33 is 1.024MHz. Frequencies above this may cause the device to malfunction.
• Can I use the DS1338U-33 in a 5V system?
  No, the DS1338U-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 DS1338U-33 to its default state?
  To reset the DS1338U-33 to its default state, apply a low pulse to the RST pin. This will reset the device to its power-on default state.