BU9873FJ-GTE2

Overview

The BU9873FJ-GTE2 is a Real-Time Clock (RTC) integrated circuit manufactured by ROHM Semiconductor, featuring an I²C bus serial interface. It incorporates high-precision oscillation adjustment and error compensation functions to maintain accurate timekeeping. The device supports both 12-hour and 24-hour time formats and includes calendar functionality for year, month, day, and week. Key electrical specifications include a supply voltage range of 1.8 V to 5.5 V and a timekeeping voltage minimum of 1.45 V. Typical timekeeping current is 0.4 µA, with a maximum of 1 µA. It operates within a temperature range of -40°C to +85°C and is housed in an SOP-J8 package.

Feature Summary

• Built-in high-precision oscillation adjustment circuit with ±30 second adjustment capability.
• Automatic leap year recognition up to the year 2099.
• Integrated oscillation stabilizing capacitors (CG, CD).
• Supports periodic interrupt (1 second to 1 month) and alarm interrupt functions via INTRB pin.

Applications

• Battery-powered portable electronic devices requiring precise timekeeping.
• Embedded systems utilizing I²C communication for clock synchronization.
• Consumer electronics needing automatic calendar and leap year handling.

Procurement Notes

This component is designated as End-of-Life (EOL) or final sales status. Verify availability through authorized distributors as stock may be limited. Confirm RoHS compliance and packaging details (SOP-J8, taping) prior to ordering. Due to its discontinued status, long-term supply cannot be guaranteed.

Selection Notes

Select this RTC when I²C interface compatibility and high precision are required without external calibration components. Ensure the system power supply remains above 1.45 V during backup mode to maintain time data. Consider the SOP-J8 package dimensions (4.9x6.0 mm) for PCB layout constraints. Evaluate alternative RTCs if continuous production volume is needed due to EOL status.

Part Context

The BU9873FJ-GTE2 belongs to ROHM's line of real-time clocks with I²C interfaces. It is designed for applications demanding low power consumption and high accuracy. The 'GTE2' suffix indicates the specific tape-and-reel packaging format. This part is distinct from general-purpose timers due to its dedicated calendar and leap year logic.

Replacement Considerations

As this part is in final sales/EOL status, direct replacements should be sought from other manufacturers offering similar I²C RTCs with built-in capacitors and high-precision adjustment. Verify pin compatibility and software register mapping before substitution.