DS1672U-3

Real Time Clock Overview

The DS1672U-3 is a Real-Time Clock (RTC) featuring a 32-bit binary counter and integrated power-monitoring functions. It utilizes an I2C serial interface for data access and includes 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, with a typical nominal voltage of 3.0V. It supports low-voltage oscillator operation down to 1.3V and offers trickle-charge capability for backup sources. The component is rated for an operating temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• 32-bit binary counter accessible via I2C serial interface
• Automatic power-fail detect and switch circuitry with reset output
• Low-voltage oscillator operation starting at 1.3V minimum
• Programmable trickle-charge capability for battery or supercapacitor backup

Real Time Clock Applications

• Systems requiring precise time-of-day and calendar tracking
• Data logging applications needing elapsed time counting
• Embedded devices with intermittent power supply requirements

Real Time Clock Procurement Notes

Verify the specific package variant, as the 'U' suffix denotes an 8-pin µSOP package. Confirm RoHS compliance status based on the ordering suffix (+). Ensure the design accommodates the required external 32.768kHz crystal with specified load capacitance. Check for end-of-life status through official manufacturer channels before finalizing procurement plans.

Real Time Clock Selection Notes

Select this component when an I2C-compatible RTC with built-in power-fail protection is required. The DS1672U-3 is suitable for designs needing a 3.0V nominal supply. Consider the µSOP package dimensions for PCB layout constraints. Evaluate the need for the internal trickle charger against external charging solutions based on backup source characteristics.

Real Time Clock Part Context

The DS1672U-3 belongs to the DS1672 family of real-time clocks manufactured by Analog Devices Inc./Maxim Integrated. This series provides nonvolatile timekeeping solutions using a 32-bit counter architecture. The U package variant specifically refers to the micro-small outline package configuration.

Real Time Clock Replacement Considerations

Direct replacement options include other members of the DS1672 family such as DS1672U-2+ or DS1672U-33+, differing primarily in nominal voltage ratings. Verify pin compatibility and software register mapping when substituting.