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Status
Part Number	Status
DS1678	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet

FULL DATA SHEET (PDF, 196kB) Download   E-Mail

Description

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 Underwriters Laboratories (UL®) Recognized

Diagram

Typical Operating Circuit

Application Notes

Application Note 58: Crystal Considerations with Dallas Real-Time Clocks (RTCs) - DS1678, DS1678 Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1678 Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1678 Application Note 701: Using the DS32kHz with Dallas Real-Time Clocks - DS1678 Application Note 3643: How to Use the DS1678 Real-Time Event Recorder - DS1678 Application Note 3816: Selecting a Backup Source for Real-Time Clocks - DS1678

Design Guides

Real-Time Clocks (PDF)

Reliability Reports

Request Reliability Report for: DS1678 Underwriters Laboratories (UL®) Recognized

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-5 of 5

DS1678	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1678+			Active		PDIP(N);8 pin;82 mm² Outline Drawing: 21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P8+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1678			Active		PDIP(N);8 pin;82 mm² Outline Drawing: 21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P8-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1678S+			Active		SOIC (W);8 pin;44 mm² Outline Drawing: 21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1678S+T&R			Active		SOIC (W);8 pin;44 mm² Outline Drawing: 21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1678S		N/A	No Longer Available	DS1678S+	SOIC (W);8 pin;44 mm² Outline Drawing: 21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

More Information

New Product Press Release 2001-09-11  Dataloggers and Environmental Sensors

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Technical Documents

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

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