AB-RTC-XB-32.768KHZ-2-T3

Overview

The Abracon AB-RTC-XB-32.768kHz-2 is a Real-Time Clock module featuring an integrated 32.768kHz crystal unit and I2C bus interface. It operates within a supply voltage range of 1.2V to 5.5V, with an interface voltage (VIO) of 1.6V to 5.5V. The device consumes 0.9µA typically at 3.0V in timekeeping mode. Key features include leap year autocorrection, digital offset adjustment, alarm capabilities, and automatic backup battery switching. It provides a frequency output (FOUT), reset signal (/RST), and interrupt output (/INT). The component is housed in a compact 10-SMD, No Lead package measuring 3.2 x 2.5 mm.

Feature Summary

• Integrated 32.768kHz crystal with ±23ppm frequency tolerance at +25°C
• Ultra-low power consumption: 0.9µA typical at 3.0V
• Automatic backup battery switching and leap year correction
• I2C interface supporting up to 400kHz clock speed

Applications

• IoT and wireless communication devices
• Medical instrumentation
• Utility meters and data loggers
• Consumer electronics appliances

Procurement Notes

Verify the T3 suffix indicates a reel quantity of 3,000 pieces per EIA-481 standard. Confirm VBAT pin connection requirements for backup functionality. Ensure VDD is supplied above 2.5V during initial power-on for oscillation stabilization. Check that the device meets REACH/RoHS II compliance standards for your region.

Selection Notes

Select this model when a compact SMD RTC with built-in crystal is required. The 1.2V minimum operating voltage suits low-power battery applications. Verify interface voltage compatibility, as VIO must be between 1.6V and 5.5V. Consider the 10-pin package size if space constraints are critical compared to larger RTC packages.

Part Context

This part belongs to the Abracon Real-Time Clock family, specifically designed for low-power applications requiring precise timekeeping without external crystals. It integrates timing accuracy and power management features into a single small form factor, distinguishing it from discrete RTC ICs that require separate oscillator components.

Replacement Considerations

Check pinout compatibility for direct replacement. Verify I2C address and register mapping differences if substituting with other RTC models. Ensure the replacement supports the same voltage ranges and temperature specifications (-40°C to +85°C).