crystal oscillator (TCXO) with a very accurate, tempera-
ture-compensated, integrated real-time clock (RTC) and
236 bytes of battery-backed SRAM. Additionally, the
DS3232 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 DS3232
is available in commercial and industrial temperature
ranges, and is offered in an industry-standard 20-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.
Ordering Information
PART
DS3232S#
DS3232SN#
TEMP RANGE
0°C to +70°C
-40°C to +85°C
PIN-
PACKAGE
20 SO
20 SO
TOP
MARK
DS3232
DS3232N
Servers
Telematics
Applications
Functional Diagrams
Utility Power Meters
GPS
#Denotes
a RoHS-compliant device that may include lead that
is exempt under the RoHS requirements. 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 a RoHS-compliant device.
Typical Operating Circuit
R
PU
= t
R
/ C
B
V
CC
R
PU
SCL
SDA
RST
μP
PUSH-
BUTTON
RESET
R
PU
SCL
SDA
RST
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
V
CC
INT/SQW
32kHz
V
BAT
V
CC
V
CC
Pin Configuration
TOP VIEW
N.C. 1
N.C. 2
32kHz 3
V
CC
4
INT/SQW 5
RST 6
20 SCL
19 N.C.
18 SCL
17 SDA
DS3232
16 V
BAT
15 GND
14 N.C.
13 N.C.
12 N.C.
11 N.C.
DS3232
GND
N.C.
N.C.
N.C.
N.C.
N.C.
N.C. 7
N.C. 8
N.C. 9
N.C. 10
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
SO
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5337; Rev 5; 7/10
DS3232
Extremely Accurate I
2
C RTC with
Integrated Crystal and SRAM
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
, V
BAT
, 32kHz, SCL, SDA,
RST,
INT/SQW
Relative to Ground.............................-0.3V to +6.0V
Junction-to-Ambient Thermal Resistance (θ
JC
) (Note 1)..55.1°C/W
Junction-to-Case Thermal Resistance (θ
JC
) (Note 1)..........24°C/W
Operating Temperature Range
(noncondensing) .............................................-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.)
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.
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER
Supply Voltage
Logic 1 Input SDA, SCL
Logic 0 Input SDA, SCL
SYMBOL
V
CC
V
BAT
V
IH
V
IL
CONDITIONS
MIN
2.3
2.3
0.7 x
V
CC
-0.3
TYP
3.3
3.0
MAX
5.5
5.5
V
CC
+
0.3
+0.3 x
V
CC
UNITS
V
V
V
ELECTRICAL CHARACTERISTICS
(V
CC
= 2.3V to 5.5V, V
CC
= active supply (see Table 1), T
A
= -40°C to +85°C, 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
Active Supply Current
SYMBOL
I
CCA
CONDITIONS
32kHz output off
(Notes 4, 5)
I
2
C bus inactive, 32kHz
output off, SQW output off
(Note 5)
I
2
C bus inactive, 32kHz
output off, SQW output off
V
CC
= 3.3V
V
CC
= 5.5V
V
CC
= 3.3V
V
CC
= 5.5V
V
CC
= 3.3V
V
CC
= 5.5V
2.45
2.575
MIN
TYP
MAX
200
325
120
µA
160
500
600
2.70
µA
V
UNITS
µA
Standby Supply Current
I
CCS
Temperature Conversion Current
Power-Fail Voltage
I
CCSCONV
V
PF
ACTIVE SUPPLY (Table 1 ) (2.3V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted) (Note 2)
Logic 1 Output, 32kHz
I
OH
= -1mA
I
OH
= -0.75mA
I
OH
= -0.14mA
Active supply > 3.3V,
3.3V > active supply > 2.7V,
2.7V > active supply > 2.3V
V
OH
2.0
V
2
Maxim Integrated
DS3232
Extremely Accurate I
2
C RTC with
Integrated Crystal and SRAM
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.3V to 5.5V, V
CC
= active supply (see Table 1), T
A
= -40°C to +85°C, 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
Logic 0 Output,
INT/SQW,
SDA
Logic 0 Output,
RST,
32kHz
Output Leakage Current 32kHz,
INT/SQW,
SDA
Input Leakage SCL
RST
Pin I/O Leakage
TCXO
Output Frequency
Duty Cycle
(Revision A3 Devices)
Frequency Stability vs.
Temperature
Frequency Stability vs. Voltage
Trim Register Frequency
Sensitivity per LSB
Temperature Accuracy
Crystal Aging
Δf/f
OUT
Δf/V
f
OUT
V
CC
= 3.3V or V
BAT
= 3.3V
2.97V
≤
V
CC
< 3.63
0°C to +40°C
V
CC
= 3.3V or
V
BAT
= 3.3V
V
CC
= 3.3V or V
BAT
= 3.3V
-40°C
Δf/LSB
Specified at:
+25°C
+70°C
+85°C
Temp
Δf/f
0
V
CC
= 3.3V or V
BAT
= 3.3V
After reflow,
not production tested
First year
0–10 years
-3
±1.0
±5.0
-40°C to 0°C and
+40°C to +85°C
31
-2
-3.5
1
0.7
0.1
0.4
0.8
+3
°C
ppm
ppm
32.768
69
+2
+3.5
ppm
ppm/V
kHz
%
SYMBOL
V
OL
V
OL
I
LO
I
LI
I
OL
RST
high impedance (Note 6)
I
OL
= 3mA
I
OL
= 1mA
Output high impedance
-1
-1
-200
0
CONDITIONS
MIN
TYP
MAX
0.4
0.4
+1
+1
+10
UNITS
V
V
µA
µA
µA
ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BAT
= 2.3V to 5.5V,
T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
Active Battery Current
(Note 5)
Timekeeping Battery Current
(Note 5)
Temperature Conversion Current
Data-Retention Current
SYMBOL
I
BATA
CONDITIONS
EOSC
= 0, BBSQW = 0,
SCL = 400kHz, BB32kHz = 0
EOSC
= 0, BBSQW = 0,
SCL = SDA = 0V,
BB32kHz = 0,
CRATE0 = CRATE1 = 0
V
BAT
= 3.3V
V
BAT
= 5.5V
V
BAT
= 3.4V
V
BAT
= 5.5V
1.5
1.5
MIN
TYP
MAX
80
200
2.5
µA
3.0
600
100
µA
nA
UNITS
µA
I
BATT
I
BATTC
I
BATTDR
EOSC
= 0, BBSQW = 0, SCL = SDA = 0V
EOSC
= 1, SCL = SDA = 0V, +25°C
Maxim Integrated
3
DS3232
Extremely Accurate I
2
C RTC with
Integrated Crystal and SRAM
AC ELECTRICAL CHARACTERISTICS
(Active supply (see Table 1) = 2.3V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
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