Real-Time Clock. DS3232M Datasheet

DS3232M Clock. Datasheet pdf. Equivalent

Part DS3232M
Description I2C Real-Time Clock
Feature DS3232M ±5ppm, I2C Real-Time Clock with SRAM General Description The DS3232M is a low-cost, extreme.
Manufacture Maxim Integrated
Datasheet
Download DS3232M Datasheet



DS3232M
DS3232M
±5ppm, I2C Real-Time Clock with SRAM
General Description
The DS3232M is a low-cost, extremely accurate, I2C
real-time clock (RTC) with 236 bytes of battery-backed
SRAM. The device incorporates a battery input and
maintains accurate timekeeping when main power to the
device is interrupted. The integration of the microelec-
tromechanical systems (MEMS) resonator enhances the
long-term accuracy of the device and reduces the piece-
part count in a manufacturing line.
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 1Hz output are provided. Address and data
are transferred serially through an I2C bidirectional bus.
A precision temperature-compensated voltage reference
and comparator circuit monitors the status of VCC to
detect power failures, to provide a reset output, and to
automatically switch to the backup supply when neces-
sary. Additionally, the RST pin is monitored as a pushbut-
ton input for generating a microprocessor reset. See the
Block Diagram for more details.
Power Meters
Industrial Applications
Applications
Ordering Information appears at end of data sheet.
Features
S Timekeeping Accuracy ±5ppm (±0.432 Second/
Day) from -40NC to +85NC
S 236 Bytes of Battery-Backed User SRAM
S Battery Backup for Continuous Timekeeping
S Low Power Consumption
S Functionally Compatible to DS3232
S Complete Clock Calendar Functionality Including
Seconds, Minutes, Hours, Day, Date, Month, and
Year with Leap Year Compensation Up to Year
2100
S Two Time-of-Day Alarms
S 1Hz and 32.768kHz Outputs
S Reset Output and Pushbutton Input with
Debounce
S Fast (400kHz) I2C-Compatible Serial Bus
S +2.3V to +4.5V Supply Voltage
S Digital Temp Sensor with ±3NC Accuracy
S -40NC to +85NC Temperature Range
S 8-Pin SO (150 mils) Package
S Underwriters Laboratories (UL) Recognized
Typical Operating Circuit
VCC VCC
I/O PORT
INTERRUPTS
CPU
PUSH-
BUTTON
RESET
SCL
SDA
DS3232M
INT/SQW
32KHZ
RST VBAT
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/DS3232M.related
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may
be simultaneously available through various sales channels. For information about device errata, go to: www.maximintegrated.com/errata.
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.
19-6247; Rev 2; 7/13



DS3232M
DS3232M
±5ppm, I2C Real-Time Clock with SRAM
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to GND.........-0.3V to +6.0V
Operating Temperature Range........................... -40NC to +85NC
Storage Temperature Range............................. -55NC to +125NC
Junction Temperature......................................................+150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
SO
Junction-to-Ambient Thermal Resistance (qJA).........120°C/W
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.maximintegrated.com/thermal-tutorial.
RECOMMENDED OPERATING CONDITIONS
(TA = -40NC to +85NC, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage
VCC
VBAT
Logic 1
VIH
Logic 0
VIL
MIN
2.3
2.3
0.7 x
VCC
-0.3
TYP
3.3
3.0
MAX
4.5
4.5
VCC +
0.3
0.3 x
VCC
UNITS
V
V
V
ELECTRICAL CHARACTERISTICS—FREQUENCY AND TIMEKEEPING
(VCC or VBAT = +3.3V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, VBAT = +3.0V, and
TA = +25NC, unless otherwise noted.) (Note 2)
PARAMETER
1Hz Frequency Tolerance
1Hz Frequency Stability vs. VCC
Voltage
SYMBOL
CONDITIONS
Df/fOUT Measured over R 10s interval
Df/V
Timekeeping Accuracy
32kHz Frequency Tolerance
tKA
Df/fOUT
MIN TYP MAX UNITS
Q5 ppm
Q1 ppm/V
Q0.432
Seconds/
Day
Q2.5
%
DC ELECTRICAL CHARACTERISTICS—GENERAL
(VCC = +2.3V to +4.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, VBAT = +3.0V, and
T= +25NC, unless otherwise noted.) (Note 2)
PARAMETER
Active Supply Current
(I2C Active)
SYMBOL
ICCA (Note 3)
CONDITIONS
MIN TYP MAX UNITS
125 250
µA
Standby Supply Current
(I2C Inactive)
ICCS (Notes 3, 4)
100 175
µA
Maxim Integrated
  2





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)