DS1384

看门狗实时时钟控制器


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说明

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.

关键特性

  • 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%
产品可靠性报告: DS1384.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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