Watchdog Real Time Clocks Controller

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The DS1384 Watchdog Timekeeping Controller integrates critical processor and memory support functions: real-time clock/calendar in BCD format, clock/calendar alarms, interval timer, and watchdog timer with processor restart. The DS1384 further integrates controller circuitry to monitor power to 128k x 8 external static SRAM with automatic backup switching and write protection. Additionally, 50 bytes of user RAM are available for system configuration, calibration data, or scratchpad.

Clock and alarm settings are programmed and on-chip memory is addressed through a bytewide interface. The clock data can be output in either 24-hour or 12-hour format with a.m./p.m. indicator.

The DS1384 connects to a 32.768kHz crystal for a clock reference and battery for backup; no external capacitors or resistors are required. Dallas timekeepers operate with the lowest power consumption in the industry, consuming less than 0.5µA while maintaining accurate and reliable timekeeping on battery power.

Key Features

  • Real-time clock/calendar: tracks hundredths of seconds, seconds, minutes, hours, days, date, months, years, and leap years
  • Accuracy >±2 minutes/month at 25°C
  • Watchdog timer monitors/restarts processor
  • Programmable time-of-day and real-time watchdog alarms
  • Interrupt outputs active during battery backup mode
  • Controller circuitry supports up to 128k x 8 external SRAM
  • All registers individually addressed through bytewide interface
  • 50 bytes of user NV RAM
  • Low-power CMOS circuitry: <1µA battery current in standby mode
  • Square wave outputs
  • Operating range: 0°C to +70°C
  • Voltage/power-fail tolerance: 5V ±10%

Technical Documents

App Note 701 Using the DS32kHz with Maxim Real-Time Clocks

Additional Resources

Other Watchdog Clocks
RTC Calculator
Product Reliability Reports: DS1384.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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