DS1672S-2

Real Time Clock Overview

The DS1672S-2 is an I2C serial real-time clock and 32-bit binary counter manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 1.8V to 5.5V and supports standard (100kHz) and fast (400kHz) I2C modes. The device features automatic power-fail detection, switching to a backup supply when VCC drops below the trip point. It includes a programmable trickle charger for battery or supercapacitor maintenance. Operating temperatures range from -40°C to +85°C in an 8-pin SO package.

Real Time Clock Feature Summary

• I2C Serial Interface supporting Standard and Fast modes
• Automatic Power-Fail Detect and Switch Circuitry
• Programmable Trickle Charger with selectable resistor/diode options
• Low-Voltage Oscillator Operation starting at 1.3V minimum

Real Time Clock Applications

• Portable system controllers requiring precise timekeeping
• Battery-powered devices needing low standby current
• Systems requiring microprocessor reset signals during power transitions

Real Time Clock Procurement Notes

Verify RoHS compliance status as indicated by the '+' suffix in ordering information. Confirm package type matches the 'S' designation for 8-pin SO. Check for lead-free certification documentation if required by local regulations. Ensure availability through authorized distributors given potential lifecycle changes.

Real Time Clock Selection Notes

Select the DS1672S-2 variant specifically for 2.0V nominal operation within the 1.8V to 5.5V range. Choose the 'S' suffix for Surface Mount SO packages. Consider the DS1672S-3+ or DS1672S-33+ if system voltages are closer to 3.0V or 3.3V respectively. Verify crystal specifications match the internal oscillator requirements.

Real Time Clock Part Context

The DS1672 series belongs to Maxim Integrated's line of real-time clocks featuring 32-bit counters. The DS1672S-2 is the surface-mount version designed for 2.0V systems. It shares core functionality with PDIP and µSOP variants but differs in physical footprint and thermal characteristics suitable for PCB integration.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers: DS1672S-3+, DS1672S-33+. These variants offer identical functionality with different nominal supply voltage ratings.