DS1337C# datasheet by Maxim Integrated Products

DS1337C# Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the DS1337C#?
  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 handle the case where the battery is removed or replaced?
  When the battery is removed or replaced, the DS1337C# will reset and lose its clock data. To handle this, use a capacitor to maintain the VBAT voltage during battery replacement, or use a supervisory circuit to detect battery removal and reset the device.
• What is the purpose of the RST pin, and how do I use it?
  The RST pin is an active-low reset input that resets the DS1337C# when pulled low. It can be used to reset the device during power-up or to recover from a fault condition. Connect a pull-up resistor to VCC and a capacitor to ground to ensure a clean reset signal.
• How do I ensure accurate timekeeping with the DS1337C#?
  To ensure accurate timekeeping, use a high-quality crystal oscillator, ensure the device is operated within the recommended temperature range, and avoid exposing the device to electromagnetic interference (EMI). Additionally, consider using a temperature-compensated crystal oscillator for improved accuracy.
• Can I use the DS1337C# in a battery-backed SRAM application?
  Yes, the DS1337C# can be used in a battery-backed SRAM application. The device's VBAT pin can be connected to a battery, and the SRAM can be connected to the device's data bus. The DS1337C# will maintain the SRAM data during power-down and restore it when power is reapplied.