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Maxim Integrated Semiconductor Electronic Components Datasheet

DS1341 Datasheet

(DS1341 / DS1342) Low-Current I2C RTCs

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19-4998; Rev 0; 10/09
Low-Current I2C RTCs for High-ESR Crystals
General Description
The DS1341/DS1342 low-current real-time clocks (RTCs)
are timekeeping devices that provide an extremely low
standby current, which permits longer life from a power
supply. The DS1341/DS1342 support high-ESR crystals,
which broaden the pool of usable crystals for the devices.
The DS1341 uses a 6pF crystal, while the DS1342 uses a
12.5pF crystal. These devices are accessed through an
I2C serial interface. Other features include two time-of-day
alarms, two interrupt outputs, a programmable square-
wave output, and a serial bus timeout mechanism.
The clock/calendar provides seconds, minutes, hours,
day, date, month, and year information. The date at the
end of the month is automatically adjusted for months
with fewer than 31 days, including corrections for leap
year. The clock operates in either 24hr or 12hr format
with an AM/PM indicator.
The DS1341/DS1342 also include an input for synchroni-
zation. When a reference clock (e.g., 60Hz power line or
GPS 1PPS) is present at the CLKIN pin and the enable
external clock input bit (ECLK) is set to 1, the DS1341/
DS1342 RTCs are frequency-locked to the external clock
and the clock accuracy is determined by the external
source. In case of external clock failure, the clock is
switched to the crystal oscillator.
The devices are available in a lead(Pb)-free/RoHS-
compliant, 8-pin FSOP package. The devices support a
-40NC to +85NC extended temperature range.
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Point of Sale (POS)
Telematics
Applications
Portable Instruments
Portable Audio
Automotive
Typical Operating Circuit
VCC VCC
RPU RPU RPU
CPU
SCL VCC
SDA
CLKIN/INTA
SQW/INTB
X1
X2
DS1341/DS1342
GND
Features
S Low Timekeeping Current of 250nA (typ)
S Compatible with Crystal ESR Up to 80kI
S Use Crystals with CL = 6pF (DS1341) or
CL = 12.5pF (DS1342)
S +1.8V to +5.5V Operating Voltage Range
S Maintain Time Down to +1.15V (typ)
S Fast (400kHz) I2C Interface
S Bus Timeout for Lockup-Free Operation
S RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year with Leap Year Compensation
Valid Through 2099
S External Clock Source for Synchronization Clock
Reference (e.g., 32kHz, 50Hz/60Hz Power Line,
GPS 1PPS)
S Two Time-of-Day Alarms with Two Interrupt
Outputs
S Programmable Square-Wave Output
S Industrial Temperature Range
S Small, 8-Pin µSOP Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
OSC
CL (pF)
DS1341U+
DS1341U+T&R
DS1342U+*
DS1342U+T&R*
-40NC to +85NC
-40NC to +85NC
-40NC to +85NC
-40NC to +85NC
8 FSOP
8 FSOP
8 FSOP
8 FSOP
6
6
12.5
12.5
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*Future product—contact factory for availability.
Pin Configuration
TOP VIEW
X1 1 +
X2
CLKIN/INTA
GND
2
3
4
DS1341
DS1342
µSOP
8 VCC
7 SQW/INTB
6 SCL
5 SDA
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

DS1341 Datasheet

(DS1341 / DS1342) Low-Current I2C RTCs

No Preview Available !

Low-Current I2C RTCs for High-ESR Crystals
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground....-0.3V to +6.0V
Operating Temperature Range........................... -40NC to +85NC
Junction-to-Ambient Thermal
Resistance (BJA) (Note 1)......................................... +221NC/W
Junction-to-Case Thermal
Resistance (BJC) (Note 1) .......................................... +39NC/W
Junction Temperature Maximum.....................................+150NC
Storage Temperature Range............................ -55NC to +125NC
Soldering Temperature.......................... Refer to the IPC/JEDEC
J-STD-020 Specification.
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +1.8V to +5.5V, TA = -40NC to +85NC, unless otherwise noted.) (Note 2)
PARAMETER
Operating Voltage Range
Minimum Timekeeping Voltage
Timekeeping Current: DS1341
CLKIN = GND or CLKIN = VCC
(Note 4)
SYMBOL
VCC
VCCT
VCCTMIN
ICCT
CONDITIONS
Full operation (Note 3)
Timekeeping (Notes 3, 4)
TA = +25NC (Notes 3, 4)
VCC = +3.0V, EGFIL = 0, DOSF = 1
VCC = +5.5V
VCC = +3.0V, EGFIL = 1, DOSF = 0
VCC = +5.5V
Logic 1 Input
VIH (Note 2)
Logic 0 Input
Input Leakage
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(SCL, CLKIN/INTA)
Output Leakage
(CLKIN/INTA, SQW/INTB)
Output Logic 1
VOH = +1.0V (SQW /INTB)
Output Logic 0
VOL = +0.4V (SDA, CLKIN/INTA,
SQW/INTB)
VIL (Note 2)
ILI ECLK = 1, VIN = 0V to VCC
IO ECLK = A1IE = A2IE = 0
IOH
VCC R 1.8V, INTCN = 0
VCC R 1.3V, INTCN = 0
VCC R 1.8V
IOL
VCC R 1.3V (Note 5)
MIN
1.8
1.3
0.7 x
VCC
-0.3
-0.1
TYP MAX UNITS
5.5
5.5
V
1.15 1.3
V
220 500
250 600
280 560
nA
320 700
VCC +
0.3
V
0.3 x
VCC
V
+0.1
FA
-1.0
-3.0
-250
3.0
250
+1.0
FA
mA
FA
mA
FA
2


Part Number DS1341
Description (DS1341 / DS1342) Low-Current I2C RTCs
Maker Maxim Integrated Products
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DS1341 Datasheet PDF






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