DS1672S-3

Real Time Clock Overview

The DS1672S-3+ is a Real-Time Clock (RTC) IC featuring a 32-bit binary counter and power-monitoring functions. It utilizes an I2C serial interface for data access and includes automatic power-fail detect and switch circuitry. The device operates with a supply voltage range of 2.7V to 5.5V and supports low-voltage oscillator operation down to 1.3V. It incorporates trickle-charge capability for battery backup and provides a power-fail reset output. The component is housed in an 8-pin SOIC package and 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 detection and switching between VCC and VBACKUP
• Trickle-charge capability for battery or supercapacitor maintenance
• Low-voltage oscillator operation starting at 1.3V

Real Time Clock Applications

• Portable system controllers requiring precise timekeeping
• Embedded systems needing power-fail reset signals
• Battery-backed real-time clock applications

Real Time Clock Procurement Notes

Verify the specific suffix 'S-3+' corresponds to the 8-pin SOIC package and 3.0V nominal voltage rating. Confirm RoHS compliance status as indicated by the '+' designation. Check for end-of-life notifications, as this component series may have discontinuation notices from Analog Devices/Maxim Integrated.

Real Time Clock Selection Notes

Select the DS1672S-3+ when an 8-pin surface-mount package is required alongside I2C connectivity. Ensure the design accommodates the 32-bit binary counter format, which requires software algorithms to derive calendar dates. Verify that the external crystal matches the specified 32.768kHz frequency with a 6pF load capacitance for accurate timing.

Real Time Clock Part Context

The DS1672S-3+ belongs to the DS1672 family of RTCs manufactured by Analog Devices/Maxim Integrated. This family offers various package options including PDIP, SO, and µSOP, with different voltage variants (-2, -3, -33). The 'S' denotes the SOIC package, while '-3' indicates the 3.0V nominal supply version.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult official distributor databases for cross-reference recommendations based on pin compatibility and electrical specifications.