General Description
The DS3232 is a low-cost temperature-compensated
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.
Applications
Servers
Utility Power Meters
Telematics
GPS
Features
♦
Accuracy ±2ppm from 0°C to +40°C
♦
Accuracy ±3.5ppm from -40°C to +85°C
♦
Battery Backup Input for Continuous
Timekeeping
♦
Operating Temperature Ranges
Commercial: 0°C to +70°C
Industrial: -40°C to +85°C
♦
236 Bytes of Battery-Backed SRAM
♦
Low-Power Consumption
♦
Real-Time Clock Counts Seconds, Minutes,
Hours, Day, Date, Month, and Year with Leap Year
Compensation Valid Up to 2099
♦
Two Time-of-Day Alarms
♦
Programmable Square-Wave Output
♦
Fast (400kHz) I
2
C Interface
♦
3.3V Operation
♦
Digital Temp Sensor Output: ±3°C Accuracy
♦
Register for Aging Trim
♦
RST
Input/Output
♦
300-Mil, 20-Pin SO Package
♦
Underwriters Laboratories Recognized
DS3232
Extremely Accurate I
2
C RTC with
Integrated Crystal and SRAM
______________________________________________
Maxim Integrated Products
1
19-5337; Rev 5; 7/10
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.
Ordering Information
PART TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
DS3232S#
0°C to +70°C
20 SO
DS3232
DS3232SN#
-40°C to +85°C
20 SO
DS3232N
DS3232
V
CC
SCL
R
PU
R
PU
= t
R
/ C
B
R
PU
INT/SQW
32kHz
V
BAT
PUSH-
BUTTON
RESET
SDA
RST
N.C.
N.C.
N.C.
N.C.
V
CC
V
CC
GND
V
CC
μ
P
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
SCL
RST
SDA
Typical Operating Circuit
#
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.
TOP VIEW
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
SCL
N.C.
SCL
SDA
V
CC
32kHz
N.C.
N.C.
V
BAT
GND
N.C.
N.C.
N.C.
N.C.
RST
INT/SQW
12
11
9
10
N.C.
N.C.
N.C.
N.C.
SO
DS3232
Pin Configuration
