DS3231 Extremely Accurate I²C-Integrated RTC/TCXO/Crystal

Description

The DS3231 is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accurate timekeeping when main power to the device is interrupted. 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 DS3231 is available in commercial and industrial temperature ranges, and is offered in a 16-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 active-low 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 I²C bidirectional bus.

A precision temperature-compensated voltage reference 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 necessary. Additionally, the active-low RST pin is monitored as a pushbutton input for generating a µP reset.

Key Features

Applications/Uses

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
Low-Power Consumption
Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100
Two Time-of-Day Alarms
Programmable Square-Wave Output
Fast (400kHz) I²C Interface
3.3V Operation
Digital Temp Sensor Output: ±3°C Accuracy
Register for Aging Trim
Active-Low RST Output/Pushbutton Reset Debounce Input
Underwriters Laboratories (UL®) Recognized

	Global Positioning Systems (GPS)
	Servers
	Telematics
	Utility Power Meters

Key Specifications: Oscillator Modules

Part Number

Frequency

Oscillator Type

Tuning Adjustment Type

Frequency Output Type

Freq. Stability vs. Temp. @0 to +40°C (±ppm)

Freq. Stab. vs.Temp. @-40 to 0/ +40 to 85°C (±ppm)

Frequency Stability vs. Supply Voltage (±ppm/V)

Frequency Stability vs. Aging (±ppm)

Supply Voltage (V)

Price^**

DS3231

32.768kHz

TCXO

Digital

CMOS Open-Drain

3.5

1 (typ)

5 (0-10 Years)

2.3 to 5.5
3
3.3
5

$2.55 @ 1k

See All Oscillator Modules (28)

Key Specifications: Timekeeping & Real-Time Clocks

Part Number

Date/ Time Format (hh = sec/100)

Interface

Supply Voltage (V)

Time- keeping Current (typ) (nA)

Memory Type

Number of Time of Day Alarms

Price^**

DS3231

YY-MM-DD/ HH:MM:SS

I²C

2.3 to 5.5
3
3.3
5

840

None

$2.55 @ 1k

See All Timekeeping & Real-Time Clocks (85)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-8 of 8

DS3231

Free
Sample

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Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

DS3231S

SOIC(W);16 pin;111 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-H2*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

DS3231S/T&R

SOIC(W);16 pin;111 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-H2*

0°C to +70°C

RoHS/Lead-Free: No
Materials Analysis

DS3231S#

SOIC(W);16 pin;111 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16#H2*

0°C to +70°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

DS3231S#T&R

SOIC(W);16 pin;111 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16#H2*

0°C to +70°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

DS3231SN

SOIC(W);16 pin;111 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-H2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

DS3231SN/T&R

SOIC(W);16 pin;111 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-H2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

DS3231SN#

SOIC(W);16 pin;111 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16#H2*

-40°C to +85°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

DS3231SN#T&R

SOIC(W);16 pin;111 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16#H2*

-40°C to +85°C

RoHS/Lead-Free: RoHS Qualified
Materials Analysis

More Information

	New Product Press Release 2005-04-12
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