DS1678：Real-Time Event Recorder

The DS1678 real-time clock (RTC) event recorder records the time and date of a nonperiodic, asynchronous event each time the active-low INT pin is activated. The device records the seconds, minutes, hours, date, day of the week, month, year, and century when the first event occurs, and starts the 16-bit elapsed time counter (ETC). Subsequent events trigger the recording of the ETC into the event-log memory. This allows for up to 1025 events to be logged. Events can be logged while the device is operating from either VCC or VBAT.

Key Features
  • Real-Time Clock/Calendar in Binary-Coded Decimal (BCD) Format Counts Seconds, Minutes, Hours, Date, Month, Day of the Week, and Year with Leap Year Compensation and is Year 2000 Compliant
  • Logs Up to 1025 Consecutive Events in Read-Only Battery-Backed Memory
  • User-Programmable Event Trigger can be Triggered by the Falling Edge, Rising Edge, or Rising and Falling Edges of the active-low INT Pin
  • Event Counter Register Provides Data on the Number of Events that Have Been Logged in the Current Event-Logging Mission
  • Programmable RTC Alarm
  • 32-Byte, Battery-Backed, General-Purpose NV RAM
  • I²C Serial Interface
  • Three Resolution Options for Trade-Off Accuracy vs. Maximum Time Between Events
  • -40°C to +85°C Industrial Temperature Range
DS1678: Typical Operating Circuit
DS1678: Typical Operating Circuit
DataSheet
titleDownload file
DS1678 Data SheetDS1678.pdf
Parametrics
Part NumberInterfaceVSUPPLY
(V)		Time Keeping Current
(nA)		CL
(pF)		Memory TypeMemory Size
(Bytes)		Time of Day AlarmsFunctionsPackage/PinsBudgetary
Price
typSee Notes
DS1678I2C530012.5NV SRAM321RTCPDIP(N)/8
SOIC/8		$2.99 @1k
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS1678No Longer AvailableDS1678+PDIP(N),;8 pin;81.9 mm²-40°C to +85°CNo
DS1678+ActivePDIP(N),;8 pin;81.9 mm²-40°C to +85°CLead Free
DS1678SNo Longer AvailableDS1678S+SOIC,;8 pin;44.1 mm²-40°C to +85°CNo
DS1678S+ActiveSOIC,;8 pin;44.1 mm²-40°C to +85°CLead Free
DS1678S+T&RActiveSOIC,;8 pin;44.1 mm²-40°C to +85°CLead Free
DS1678.pdf DS1678
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State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks DS3234
Oscillator Design Considerations for Low-Current Applications DS17885
Selecting a Backup Source for Real-Time Clocks DS3234
How to Use the DS1678 Real-Time Event Recorder DS1678
Using the DS32kHz with Maxim Real-Time Clocks DS17885
Lithium Coin-Cell Batteries: Predicting an Application Lifetime DS9034PCX
Design Considerations for Maxim Real-Time Clocks DS3234
Crystal Considerations with Maxim Real-Time Clocks (RTCs) DS3234
DS1678.pdf DS1678
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