1339-2DVGI

Overview

The Renesas Electronics Corporation 1339-2DVGI is a low-power serial real-time clock (RTC) IC featuring an I2C interface. It provides clock/calendar functionality with automatic date adjustments for varying month lengths and leap years. The device supports both 12-hour and 24-hour time formats with AM/PM indicators. It includes two programmable time-of-day alarms, a programmable square-wave output, and a trickle charger. The IC operates on a main supply voltage of 2V to 5.5V and switches to a backup battery supply (1.3V to 3.7V) upon power failure to maintain timekeeping. It is housed in an 8-TSSOP package.

Feature Summary

• I2C Serial Interface: Transfers address and data via a standard two-wire serial bus.
• Automatic Date Correction: Automatically adjusts for months with fewer than 31 days and leap year corrections.
• Dual Power Supply: Operates on Vcc (2V–5.5V) with automatic switching to backup battery supply (1.3V–3.7V) during power failures.
• Programmable Outputs: Includes two time-of-day alarms and a programmable square-wave output.

Applications

• General-purpose system control applications requiring precise timekeeping.
• Portable electronic devices utilizing low-power RTC solutions.
• Systems requiring calendar functions with automatic leap year adjustment.

Procurement Notes

The 1339-2DVGI is classified as obsolete by the manufacturer. Availability is limited to existing stock or surplus channels. Verify component authenticity and condition when sourcing from non-direct distributors. Check for specific lot dates if long-term reliability is required for legacy systems.

Selection Notes

Select this component for designs requiring a simple I2C-connected RTC with built-in battery backup detection. Ensure the host microcontroller supports the I2C protocol. Verify that the operating voltage range (2V–5.5V) matches the system's primary power rail. Note that the device is obsolete; consider pin-compatible alternatives if new production is planned.

Part Context

This part belongs to the 1339 series of serial real-time clocks manufactured by Renesas Electronics (formerly IDT). It is designed for general-purpose timing applications where low power consumption and minimal external components are priorities. The 8-TSSOP package allows for surface-mount assembly in space-constrained PCB layouts.

Replacement Considerations

As the 1339-2DVGI is obsolete, verify functional equivalents such as the 1339-2DCGI or other I2C RTCs from Renesas or third-party vendors. Ensure replacement parts match the I2C interface, voltage ranges, and package dimensions (8-TSSOP) for direct board compatibility.

FAQ

What is the maximum current consumption during timekeeping?

The maximum current consumption during timekeeping is 200µA at supply voltages between 3.63V and 5.5V.

Does the 1339-2DVGI support leap year calculations?

Yes, the device automatically adjusts the date for months with fewer than 31 days, including corrections for leap years.

What is the battery backup voltage range?

The backup battery supply voltage range is 1.3V to 3.7V.