DS3231SN#T&R

Real Time Clock Overview

The DS3231SN#T&R is an industrial-grade real-time clock (RTC) integrated with a temperature-compensated crystal oscillator (TCXO). It maintains timekeeping via I2C interface and supports supply voltages from 2.3V to 5.5V. The device features ±2ppm accuracy from 0°C to +40°C and ±3.5ppm from -40°C to +85°C. Standby current ranges from 110µA to 170µA depending on voltage. It includes two alarms, a programmable square-wave output, and a digital temperature sensor with ±3°C accuracy. Packaged in a 16-pin SOIC.

Real Time Clock Feature Summary

• Integrated TCXO providing ±2ppm accuracy (0°C to +40°C) and ±3.5ppm (-40°C to +85°C)
• I2C interface supporting Fast mode up to 400kHz
• Automatic leap-year compensation valid through 2100
• Built-in power-fail detection and automatic backup switching

Real Time Clock Applications

• Servers
• Telematics
• Utility Power Meters
• GPS systems

Real Time Clock Procurement Notes

Verify the SN suffix indicates the industrial temperature range (-40°C to +85°C), distinct from the commercial S variant. Confirm the #T&R designation corresponds to tape-and-reel packaging for automated assembly. Ensure compatibility with the host system's I2C voltage levels, as the interface supports up to 5.5V regardless of VCC.

Real Time Clock Selection Notes

Select this component when high long-term accuracy without external crystals is required. The integrated TCXO reduces bill-of-materials count compared to standard RTCs. Verify that the 16-SOIC package fits the PCB layout constraints. Consider the standby current consumption if battery life is critical, noting it varies with supply voltage.

Real Time Clock Part Context

This part belongs to the DS3231 family of highly accurate serial RTCs. The 'SN' suffix specifies the industrial temperature grade, while 'S' denotes the commercial grade. The '#T&R' suffix indicates the specific reel packaging format used for surface-mount technology assembly lines.

Real Time Clock Replacement Considerations

The DS3231M+ is the equivalent industrial-grade part available in tube packaging instead of tape-and-reel. The DS3231SN+ is the non-tape version of this specific industrial package. Cross-model replacements like the DS3234 or DS3232 offer different interfaces or alarm counts but require schematic verification.