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Maxim > Products > Real-time clocks (RTCs) > DS3231

DS3231
Extremely Accurate I²C-Integrated RTC/TCXO/Crystal

Overview

Technical Documents

Ordering Info

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Status

Active: In Production.

Data Sheet

FULL DATA SHEET Download Rev 8 (PDF, 376kB) E-Mail

Description

Live Demo! Industry's Most Accurate RTC 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 VCC 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

Diagram

Typical Operating Circuit

Application Notes
Application Note 504	Design considerations for Dallas Semiconductor real-time clocks
Application Note 3506	Interfacing a DS3231 with an 8051-type microcontroller
Application Note 3572	FAQ about the integrated-crystal package option
Application Note 3644	Power considerations for accurate real-time clocks
Application Note 3816	Selecting a Backup Source for Real-Time Clocks

Design Guides

Thermal Management (PDF)

Real-Time Clocks (PDF)

System Timing & Control (PDF)

Reliability Reports
Reliability Report:	DS3231.pdf
Underwriters Laboratories (UL) Recognized

Software/Models

none

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

Filters

Part Number: Package: Any -------- SOIC MOD Temperature: Any -------- -40°C to +85°C 0°C to +70°C Tape and Reel

DS3231	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS3231S/T&R			Active	SOIC(W);16 pin;110.6 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#			Active	SOIC(W);16 pin;110.6 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			Active	SOIC(W);16 pin;110.6 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			Active	SOIC(W);16 pin;110.6 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
DS3231SN			Active	SOIC(W);16 pin;110.6 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#			Active	SOIC(W);16 pin;110.6 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			Active	SOIC(W);16 pin;110.6 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			Active	SOIC(W);16 pin;110.6 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

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More Information
New Product Press Release	[ 2005-04-12 ]

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Document Ref.: 19-5170 Rev 8; 2010-08-19
This page last modified: 2010-08-19