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

A precision temperature-compensated voltage refer-

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 reset externally.

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

♦ 3.3V Operation

♦ Digital Temp Sensor Output: ±3°C Accuracy

♦ Register for Aging Trim

♦ RST Input/Output

♦ 300-Mil, 20-Pin SO Package

Integrated Crystal and SRAM

______________________________________________

Maxim Integrated Products

1

Rev 3; 10/07

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

UL is a registered trademark of Underwriters Laboratories, Inc.

DS3232

SCL

INT/SQW

32kHz

PUSH-

BUTTON

RESET

SDA

RST

N.C.

N.C.

N.C.

N.C.

GND

CPU

N.C.

N.C.

N.C.

N.C.

N.C.

N.C.

N.C.

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

32kHz

N.C.

N.C.

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