DS1672S-3+

Real Time Clock Overview

The DS1672S-3+ is a Real-Time Clock (RTC) IC incorporating a 32-bit binary counter and power-monitoring functions. It utilizes an I2C serial interface for data access and features automatic power-fail detection with switch circuitry to maintain timekeeping during primary power loss. The device operates within a supply voltage range of 2.7V to 5.5V at VCC, with backup support down to 1.3V. It includes a trickle-charger capability for battery or supercapacitor maintenance and provides a power-fail reset output. The component is housed in an 8-pin SOIC package and supports standard and fast-mode I2C communication.

Real Time Clock Feature Summary

• 32-bit binary counter accessible via I2C serial interface
• Automatic power-fail detect and switch circuitry with RST output
• Low-voltage oscillator operation starting from 1.3V on backup supply
• Programmable trickle charger for battery or supercapacitor charging

Real Time Clock Applications

• Portable system controllers requiring precise timekeeping
• Embedded systems needing nonvolatile time data retention
• Battery-powered devices with low standby current requirements

Real Time Clock Procurement Notes

Verify the specific suffix designation (+) confirms lead-free and RoHS compliance status as per manufacturer specifications. Confirm the SOIC-8 package variant matches the required footprint for PCB layout. Ensure the ordering code corresponds to the tape-and-reel or tube packaging preference if applicable to the manufacturing process.

Real Time Clock Selection Notes

Select this component when an I2C-compatible RTC with integrated power-fail protection is required. The DS1672S-3+ is suitable for designs operating at 3.0V nominal VCC but tolerant up to 5.5V. Consider the trickle charger configuration options if direct battery charging from the main supply is necessary without external components.

Real Time Clock Part Context

The DS1672 series belongs to Maxim Integrated's line of real-time clocks featuring 32-bit counters. The 'S' suffix denotes the SOIC surface-mount package, while '-3' indicates the 3.0V nominal voltage rating. This part serves as a drop-in replacement for older Dallas Semiconductor RTCs in legacy designs requiring I2C connectivity.

Real Time Clock Replacement Considerations

Direct pin-compatible alternatives within the same family include the DS1672S-2+ (2.0V nominal) and DS1672S-33+ (3.3V nominal). Verify register compatibility and I2C address consistency when substituting between these variants.