DS1672-3

Real Time Clock Overview

The DS1672-3 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 primary 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 incorporates trickle-charge capability for battery backup. 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 detection with reset output signal
• Trickle-charge capability for battery or supercapacitor maintenance
• Low-voltage oscillator operation starting at 1.3V minimum

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify the specific package variant required, as the base model number corresponds to multiple physical packages including PDIP, SO, and µSOP. Confirm RoHS compliance status, indicated by the '+' suffix in ordering codes. Check current availability as this component series may be subject to discontinuation or limited stock depending on the distributor.

Real Time Clock Selection Notes

Select the DS1672-3 when a 3.0V nominal supply voltage is appropriate for the system design. Ensure the application requires an I2C interface rather than multiplexed or SPI alternatives. Consider the thermal characteristics of the chosen package if high ambient temperatures are expected within the specified operating range.

Real Time Clock Part Context

The DS1672 belongs to a family of RTCs that integrate a 32-bit counter and power management features. Variants such as DS1672-2+ and DS1672-33+ offer different nominal voltages, while suffixes like 'S' and 'U' denote SO and µSOP packages respectively. This specific part represents the 3.0V version in the standard PDIP package configuration.

Real Time Clock Replacement Considerations

Direct replacements include other DS1672 variants with adjusted voltage ratings (DS1672-2+, DS1672-33+) or package types (DS1672S-3+, DS1672U-3+). Verify pin compatibility and register map consistency before substituting.