The DS1677 portable system controller is a circuit that incorporates many of the functions necessary for low-power portable products integrated into one chip. The device provides a real-time clock (RTC), NV RAM controller, microprocessor monitor, power-fail warning, and a 3-channel, 8-bit analog-to-digital converter (ADC). Communication with the DS1677 is established through a simple 3-wire interface.

The RTC provides seconds, minutes, hours, day, date, month, and year information with leap year compensation. The RTC also provides an alarm interrupt. This interrupt works when the DS1677 is powered by the system power supply or when in battery-backup operation so the alarm can be used to wake up a system that is powered down.

Automatic backup and write protection of an external SRAM is provided through the VCCO and active-low CEO pins. The backup energy source used to power the RTC is also used to retain RAM data in the absence of VCC through the VCCO pin. Active-low CEO, the chip-enable output to SRAM, is controlled during power transients to prevent data corruption.
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  • Provides Real-Time Clock
    • Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap Year Compensation Valid Up to 2100
    • Power Control Circuitry Supports System Power-On from Day/Time Alarm
  • Microprocessor Monitor
    • Halts Microprocessor During Power-Fail
    • Automatically Restarts Microprocessor After Power Failure
    • Monitors Pushbutton for External Override
    • Halts and Resets an Out-of-Control Microprocessor
  • NV RAM Control
    • Automatic Battery Backup and Write Protection to External SRAM
  • 3-Channel, 8-Bit ADC
  • Simple 3-Wire Interface
  • +5.0V Operation
  • 1.25V Threshold Detector for Power-Fail Warning

请查看具体的参数规格 Timekeeping & Real-Time Clocks (78)

Part NumberInterfaceVSUPPLY
Time Keeping Current
Memory TypeTime of Day AlarmsFunctionsPackage/PinsBudgetary
typSee Notes
DS1677 3-Wire53006None1
NV SRAM Control
$5.04 @1k

Pricing Notes:
产品可靠性报告: DS1677.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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±5ppm, I2C Real-Time Clock with Integrated MEMS Oscillator

  • Highly Accurate RTC with Integrated MEMS Resonator Completely Manages All Timekeeping Functions
  • 64-Byte RAM for User Data Storage
  • Simple Serial Interface Connects to Most Microcontrollers