_______________________________________________________________ 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.

19-5312; Rev 1; 5/11

+Denotes a lead(Pb)-free/RoHS-compliant package.

*Future product—contact factory for availability.

Typical Operating Circuit

General Description

real-time clock (RTC). The device incorporates a battery

input and maintains accurate timekeeping when main

power to the device is interrupted. The integration of

the microelectromechanical systems (MEMS) resona-

tor enhances the long-term accuracy of the device and

reduces the piece-part count in a manufacturing line.

The DS3231M is available in the same footprint as the

popular DS3231 RTC.

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

bus. A precision temperature-compensated voltage

reference and comparator circuit monitors the status of

and to automatically switch to the backup supply when

necessary. Additionally, the RST pin is monitored as a

pushbutton input for generating a microprocessor reset.

See the Block Diagram for more details.

Applications

Power Meters

Industrial Applications

Ordering Information

Features

S

Timekeeping Accuracy Q5ppm (Q0.432 Second/

Day) from -40NC to +85NC

S

Battery Backup for Continuous Timekeeping

S

Low Power Consumption

S

Footprint and Functionally Compatible to DS3231

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

S

+2.3V to +5.5V Supply Voltage

S

Digital Temp Sensor with Q3NC Accuracy

S

-40NC to +85NC Temperature Range

S

8-Pin or 16-Pin SO (300 mils) Packages

S

Underwriters Laboratories (UL) Recognized

DS3231M

SCL

SDA

32KHZ

INT/SQW

RST

+3.3V

+3.3V

CPU

I/O PORT

INTERRUPTS

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

PART

TEMP RANGE

PIN-PACKAGE

DS3231MZ+*

-40NC to +85NC

8 SO

DS3231M+

-40NC to +85NC

16 SO