DS1672U-2+

Real Time Clock Overview

The DS1672U-2+ is an I2C serial real-time clock and 32-bit counter manufactured by Analog Devices Inc./Maxim Integrated. It features a precision temperature-compensated reference and comparator circuit that monitors VCC status, generating an internal power-fail signal to force the reset output active during out-of-tolerance conditions. The device operates with a low-voltage oscillator starting at 1.3V minimum and includes trickle-charge capability for backup power sources. It supports standard and fast mode I2C communication protocols.

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 (1.3V min)
• Programmable trickle-charge capability for battery or supercapacitor maintenance

Real Time Clock Applications

• Real-time clock systems requiring I2C connectivity
• Embedded devices needing precise timekeeping with backup power support
• Systems requiring automatic power-fail detection and microprocessor reset generation

Real Time Clock Procurement Notes

Verify the specific voltage variant (DS1672U-2+) corresponds to the required supply voltage range of 1.8V to 5.5V with a nominal 2.0V rating. Confirm the µSOP package dimensions match the PCB footprint requirements. Ensure the design accounts for the open-drain nature of SDA, SCL, and RST pins, necessitating external pull-up resistors for proper I2C bus operation.

Real Time Clock Selection Notes

Select the DS1672U-2+ when a 2.0V nominal supply voltage is preferred within the 1.8V to 5.5V operating range. Choose this model over other variants if the µSOP (3mm) package is required for space-constrained designs. Consider the trickle charger configuration options if direct battery charging from VCC is needed without external components.

Real Time Clock Part Context

The DS1672U-2+ belongs to the DS1672 family of I2C real-time clocks. The 'U' suffix denotes the 8-pin µSOP package, while '-2' indicates the 2.0V nominal voltage variant. The '+' suffix signifies lead-free/RoHS compliance. This component integrates a 32-bit counter, power-monitoring functions, and a programmable trickle charger into a single low-power IC.

Real Time Clock Replacement Considerations

Direct replacements include other DS1672 variants such as DS1672U-3+ (3.0V nominal) or DS1672U-33+ (3.3V nominal), provided the system voltage aligns with their specifications. Cross-family replacements may require verification of I2C address compatibility and register map alignment.