DS3231S/T&R

Real Time Clock Overview

The DS3231S#T&R is a temperature-compensated real-time clock (RTC) integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It features an I²C interface and operates within a supply voltage range of 2.3V to 5.5V, with a maximum current consumption of 170µA at 5.5V. The device maintains timekeeping accuracy of ±2ppm from -40°C to +85°C through an internal TCXO. It includes two programmable alarms, a square wave output, and a battery input for backup power. The component is housed in a 16-SOIC package and supports standard and fast-mode I²C communication protocols.

Real Time Clock Feature Summary

• Integrated Temperature-Compensated Crystal Oscillator (TCXO) providing ±2ppm accuracy over the industrial temperature range (-40°C to +85°C).
• Dual power inputs: Main supply (VCC) and backup battery (VBAT) ensure continuous operation during power loss.
• I²C serial interface supporting Standard Mode (100kHz) and Fast Mode (400kHz) communication.
• Two independent programmable alarm outputs and a configurable square wave generator.

Real Time Clock Applications

• Industrial control systems requiring precise timestamping.
• Data logging equipment needing reliable time tracking.
• Smart metering devices for accurate billing intervals.
• Environmental monitoring terminals operating in extreme temperatures.

Real Time Clock Procurement Notes

Verify that the specific ordering suffix matches the required packaging format, such as Tape & Reel (TR), Cut Tape (CT), or Digi-Reel®. Confirm the RoHS compliance status and lead times directly with the manufacturer or authorized distributors before placing orders. Ensure the selected variant aligns with the intended production volume and assembly requirements.

Real Time Clock Selection Notes

Select this component when high precision is critical across wide temperature variations. The integrated TCXO eliminates the need for external crystals and compensation circuits. Verify that the system's I²C bus speed does not exceed 400kHz and that the voltage levels are compatible with the 2.3V–5.5V operating range. Consider the 16-SOIC package dimensions for PCB layout constraints.

Real Time Clock Part Context

This part belongs to the DS3231 family of highly accurate RTCs. The 'S' designation typically indicates the commercial temperature grade (0°C to +70°C), while the '#T&R' suffix specifies the tape and reel packaging configuration for automated surface-mount assembly. Other variants may include different temperature grades or package types.

Real Time Clock Replacement Considerations

Direct replacements include other DS3231 variants with different packaging or temperature ratings, such as the DS3231M. Cross-referencing with similar I²C RTCs requires verifying pin compatibility and register mapping differences.