DS1339U-33+ datasheet by Maxim Integrated Products

DS1339U-33+ Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the DS1339U-33+?
  The recommended power-up sequence is to apply VCC first, followed by a valid clock signal, and then the reset signal (RST) can be released.
• How do I ensure the accuracy of the clock output?
  To ensure accuracy, use a high-quality crystal oscillator, keep the crystal and surrounding components away from noise sources, and use a decoupling capacitor between VCC and GND.
• What is the maximum frequency deviation of the DS1339U-33+?
  The maximum frequency deviation is ±100 ppm over the operating temperature range of -40°C to +85°C.
• Can I use the DS1339U-33+ with a battery-backed clock?
  Yes, the DS1339U-33+ can be used with a battery-backed clock. The device has a battery switch-over feature that allows it to automatically switch to a backup battery when the main power supply fails.
• How do I program the clock calendar?
  The clock calendar can be programmed using the I2C interface. The device has a set of registers that can be written to set the time, date, and alarm settings.