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Maxim Integrated Semiconductor Electronic Components Datasheet

DS1678 Datasheet

Real-Time Event Recorder

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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 VCC or VBAT.
TYPICAL OPERATING CIRCUIT
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
-40C to +85C Industrial Temperature
Range
Underwriters Laboratory (UL) Recognized
PIN CONFIGURATION
TOP VIEW
X1
X2
VBAT
GND
18
DS1678
27
36
45
VCC
INT
SCL
SDA
PDIP (300 mils)
SO (208 mils)
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(Pb)-free
device.
+ Denotes a lead(Pb)-free/RoHS-compliant device.
* I2CI
fd
AI
PI
tI
ds.
2Cs
2Cd
2Cs
2C
1 of 25
REV: 100405


Maxim Integrated Semiconductor Electronic Components Datasheet

DS1678 Datasheet

Real-Time Event Recorder

No Preview Available !

DS1678 Real-Time Event Recorder
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground……………………………………………..-0.3V to +6.0V
Operating Temperature Range (noncondensing)…………………………………………...-40°C to +85°C
Storage Temperature Range…………………………………………………………….…-55°C to +125°C
Soldering Temperature………………………………………….See IPC/JEDEC J-STD-020 Specification
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation
sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect device
reliability.
RECOMMENDED DC OPERATING CONDITIONS
(VCC = VCC(MIN) to VCC(MAX), TA = -40°C to +85°C, unless otherwise noted. Typical values are at nominal
supply voltage and TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Power-Supply Voltage
Input Logic 1
Input Logic 0
Pullup Resistor Value
Battery Voltage
VCC
VIH
VIL
VPU
VBAT
(Note 2)
(Note 2)
(Note 2)
VCC = 0V (Note 2)
(Note 2)
4.5 5.0 5.5
V
2.2
VCC +
0.3
V
-0.3 +0.8 V
5.5 V
2.6 3.5 V
DC ELECTRICAL CHARACTERISTICS
(VCC = VCC(MIN) to VCC(MAX), TA = -40°C to +85°C.)
PARAMETER SYMBOL
CONDITIONS
SDA, SCL
SDA output off
Input Leakage
INT
ILI INT output off
Logic 0 Output
IOL = 4mA (SDA, INT)
Active Supply Current
VOL
ICCA
Power-Fail Voltage (Note 2)
VPF VBAT = 3.0V
LOBAT Trip Point
LOBATTRP
DC ELECTRICAL CHARACTERISTICS
(VCC = 0V, TA = -40°C to +85°C.) (Note 1)
PARAMETER SYMBOL
CONDITIONS
VBAT Current
(Oscillator On)
VBAT Current
(Oscillator Off)
IOSC
IBAT
MIN
-1
1.216
x VBAT
TYP
10
1
1.25 x
VBAT
1.35
MAX
+1
UNITS
A
0.4
2
1.284
x VBAT
V
mA
V
MIN
TYP
300
50
MAX UNITS
500 nA
150 nA
2 of 25


Part Number DS1678
Description Real-Time Event Recorder
Maker Maxim Integrated
Total Page 25 Pages
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