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DS3231SN#

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
DS3231
Extremely Accurate I
2
C-Integrated
RTC/TCXO/Crystal
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
General Description
The DS3231 is a low-cost, extremely accurate I
2
C real-
time clock (RTC) with an integrated temperature-
compensated crystal oscillator (TCXO) and crystal. The
device incorporates a battery input, and maintains accu-
rate timekeeping when main power to the device is inter-
rupted. The integration of the crystal resonator enhances
the long-term accuracy of the device as well as reduces
the piece-part count in a manufacturing line. The DS3231
is available in commercial and industrial temperature
ranges, and is offered in a 16-pin, 300-mil SO package.
The RTC maintains 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 the 24-hour or 12-hour format
with an AM/PM indicator. Two programmable time-of-
day alarms and a programmable square-wave output
are provided. Address and data are transferred serially
through an I
2
C bidirectional bus.
A precision temperature-compensated voltage refer-
ence and comparator circuit monitors the status of V
CC
to detect power failures, to provide a reset output, and
to automatically switch to the backup supply when nec-
essary. Additionally, the RST pin is monitored as a
pushbutton input for generating a µP reset.
Applications
Servers Utility Power Meters
Telematics GPS
Features
o Accuracy ±2ppm from 0°C to +40°C
o Accuracy ±3.5ppm from -40°C to +85°C
o Battery Backup Input for Continuous
Timekeeping
o Operating Temperature Ranges
Commercial: 0°C to +70°C
Industrial: -40°C to +85°C
o Low-Power Consumption
o Real-Time Clock Counts Seconds, Minutes,
Hours, Day, Date, Month, and Year with Leap Year
Compensation Valid Up to 2100
o Two Time-of-Day Alarms
o Programmable Square-Wave Output
o Fast (400kHz) I
2
C Interface
o 3.3V Operation
o Digital Temp Sensor Output: ±3°C Accuracy
o Register for Aging Trim
o RST Output/Pushbutton Reset Debounce Input
o Underwriters Laboratories (UL) Recognized
19-5170; Rev 9; 1/13
Ordering Information
PART TEMP RANGE PIN-PACKAGE
DS3231S# 0°C to +70°C 16 SO
DS3231SN# -40°C to +85°C 16 SO
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
#Denotes an RoHS-compliant device that may include lead
(Pb) that is exempt under RoHS requirements. The lead finish
is JESD97 category e3, and is compatible with both lead-
based and lead-free soldering processes. A "#" anywhere on
the top mark denotes an RoHS-compliant device.
DS3231
V
CC
SCL
R
PU
R
PU
= t
R
/C
B
R
PU
INT/SQW
32kHz
V
BAT
PUSHBUTTON
RESET
SDA
RST
N.C.
N.C.
N.C.
N.C.
V
CC
V
CC
GND
V
CC
µP
N.C.
N.C.
N.C.
N.C.
SCL
SDA
RST
Extremely Accurate I
2
C-Integrated
RTC/TCXO/Crystal
2 Maxim Integrated
DS3231
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 2, 3)
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.
Voltage Range on Any Pin Relative to Ground......-0.3V to +6.0V
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1)....73°C/W
Junction-to-Case Thermal Resistance (θ
JC
) (Note 1) ......23°C/W
Operating Temperature Range
DS3231S ..............................................................0°C to +70°C
DS3231SN ........................................................-40°C to +85°C
Junction Temperature......................................................+125°C
Storage Temperature Range ...............................-40°C to +85°C
Lead Temperature (soldering, 10s) .................................+260°C
Soldering Temperature (reflow, 2 times max)..................+260°C
(See the
Handling, PC Board Layout, and Assembly
section.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
2.3 3.3 5.5 V
Supply Voltage
V
BAT
2.3 3.0 5.5 V
Logic 1 Input SDA, SCL V
IH
0.7 x
V
CC
V
CC
+
0.3
V
Logic 0 Input SDA, SCL V
IL
-0.3
0.3 x
V
CC
V
ELECTRICAL CHARACTERISTICS
(V
CC
= 2.3V to 5.5V, V
CC
= Active Supply (see Table 1), T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Typical values are at V
CC
=
3.3V, V
BAT
= 3.0V, and T
A
= +25°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
= 3.63V 200
Active Supply Current I
CCA
(Notes 4, 5)
V
CC
= 5.5V 300
μA
V
CC
= 3.63V 110
Standby Supply Current I
CCS
I
2
C bus inactive, 32kHz
output on, SQW output off
(Note 5)
V
CC
= 5.5V 170
μA
V
CC
= 3.63V 575
Temperature Conversion Current I
CCSCONV
I
2
C bus inactive, 32kHz
output on, SQW output off
V
CC
= 5.5V 650
μA
Power-Fail Voltage V
PF
2.45 2.575 2.70 V
Logic 0 Output, 32kHz,
INT/SQW, SDA
V
OL
I
OL
= 3mA 0.4 V
Logic 0 Output, RST V
OL
I
OL
= 1mA 0.4 V
Output Leakage Current 32kHz,
INT/SQW, SDA
I
LO
Output high impedance -1 0 +1 μA
Input Leakage SCL I
LI
-1 +1 μA
RST Pin I/O Leakage I
OL
RST high impedance (Note 6) -200 +10 μA
V
BAT
Leakage Current
(V
CC
Active)
I
BATLKG
25 100 nA
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
.
Extremely Accurate I
2
C-Integrated
RTC/TCXO/Crystal
Maxim Integrated 3
DS3231
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.3V to 5.5V, V
CC
= Active Supply (see Table 1), T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Typical values are at V
CC
=
3.3V, V
BAT
= 3.0V, and T
A
= +25°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Frequency f
OUT
V
CC
= 3.3V or V
BAT
= 3.3V 32.768 kHz
0°C to +40°C ±2
Frequency Stability vs.
Temperature (Commercial)
f/f
OUT
V
CC
= 3.3V or
V
BAT
= 3.3V,
aging offset = 00h
>40°C to +70°C ±3.5
ppm
-40°C to <0°C ±3.5
0°C to +40°C ±2
Frequency Stability vs.
Temperature (Industrial)
f/f
OUT
V
CC
= 3.3V or
V
BAT
= 3.3V,
aging offset = 00h
>40°C to +85°C ±3.5
ppm
Frequency Stability vs. Voltage f/V 1 ppm/V
-40°C 0.7
+25°C 0.1
+70°C 0.4
Trim Register Frequency
Sensitivity per LSB
f/LSB Specified at:
+85°C 0.8
ppm
Temperature Accuracy Temp V
CC
= 3.3V or V
BAT
= 3.3V -3 +3 °C
First year ±1.0
Crystal Aging f/f
O
After reflow,
not production tested
0–10 years ±5.0
ppm
ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BAT
= 2.3V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
BAT
= 3.63V 70
Active Battery Current I
BATA
EOSC = 0, BBSQW = 0,
SCL = 400kHz (Note 5)
V
BAT
= 5.5V 150
μA
V
BAT
= 3.63V 0.84 3.0
Timekeeping Battery Current I
BATT
EOSC = 0, BBSQW = 0,
EN32kHz = 1,
SCL = SDA = 0V or
SCL = SDA = V
BAT
(Note 5)
V
BAT
= 5.5V 1.0 3.5
μA
V
BAT
= 3.63V 575
Temperature Conversion Current I
BATTC
EOSC = 0, BBSQW = 0,
SCL = SDA = 0V or
SCL = SDA = V
BAT
V
BAT
= 5.5V 650
μA
Data-Retention Current I
BATTDR
EOSC = 1, SCL = SDA = 0V, +25°C 100 nA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

DS3231SN#

Mfr. #:
Buy DS3231SN#
Manufacturer:
Maxim Integrated
Description:
Real Time Clock Integrated RTC/TCXO/Crystal
Lifecycle:
New from this manufacturer.
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