DS1678 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – Real-Time Event Recorder

DS1678
Real-Time Event Recorder
www.maxim-ic.com
GENERAL DESCRIPTION
The DS1678 real-time clock (RTC) event recorder
records the time and date of a nonperiodic,
asynchronous event each time the 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 V_CC or V_BAT.
TYPICAL OPERATING CIRCUIT
PIN CONFIGURATION
TOP VIEW
X1
X2
V_BAT
GND
1
8
DS1678
2
7
3
6
4
5
V_CC
INT
SCL
SDA
PDIP (300 mils)
SO (208 mils)
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 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 Laboratory (UL) Recognized
ORDERING INFORMATION
PART^†
PIN-PACKAGE TOP MARK^††
DS1678
8 Plastic DIP
DS1678
DS1678+
8 Plastic DIP
DS1678
DS1678S
8 SO
DS1678S
DS1678S+
8 SO
DS1678S
DS1678S/T&R
8 SO (Tape and
Reel)
DS1678S
DS1678S+T&R
8 SO (Tape and
Reel)
DS1678S
† _{All devices are specified over the -40°C to +85°C operating}
range.
†† _{A “‘+” anywhere on the top mark denotes a lead-free device.}
+ Denotes a lead-free/RoHS-compliant device.
* I²C is a trademark of Philips Corp. Purchase of I²C components
from Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips I²C
Patent Rights to use these components in an I²C system, provided
that the system conforms to the I²C Standard Specification as
defined by Philips.
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