1339B-31DVGI

Overview

The Renesas 1339B-31DVGI is a low-power serial real-time clock (RTC) designed for precise timekeeping in embedded systems. It counts seconds, minutes, hours, day, date, month, and year with automatic leap-year compensation valid up to the year 2100. The device features a fast-mode I2C serial interface for address and data transfer. It includes two programmable time-of-day alarms and a programmable square-wave output. An integrated oscillator stop flag and automatic power-fail detect circuitry ensure reliable operation during supply transitions.

Feature Summary

• Automatic calendar adjustment including leap-year correction through 2100
• Built-in power-fail detection with automatic backup supply switching
• Fast-mode I2C serial interface for efficient data communication
• Programmable dual time-of-day alarms and square-wave output

Applications

• Industrial control systems requiring accurate time stamping
• Consumer electronics with battery-backed timekeeping needs
• Data logging equipment requiring date and time tracking
• Automotive infotainment and monitoring subsystems

Procurement Notes

Verify the specific suffix 'DVGI' against the official Renesas datasheet to confirm package type and temperature range compatibility. Ensure the I2C bus voltage levels match the system requirements. Confirm moisture sensitivity level handling procedures are followed during assembly to prevent damage. Check for any recent product change notifications that may affect pinout or electrical characteristics.

Selection Notes

Select this component when a dedicated RTC with I2C interface is required for space-constrained designs. It is suitable for applications needing long-term accuracy without external crystal components if using compatible packages. Consider the trickle-charge capability for battery management. Evaluate the industrial temperature range (-40°C to +85°C) against environmental conditions.

Part Context

The 1339 series from Renesas represents a family of serial real-time clocks known for low power consumption and high reliability. The 1339B variant typically denotes specific electrical or packaging distinctions within the series. These devices are widely used in general-purpose system control applications where maintaining accurate time during power outages is critical for data integrity.

Replacement Considerations

Direct replacements must support I2C interface and similar pinout configurations. Verify compatibility with existing firmware drivers for register mapping. Ensure substitute parts meet the same industrial temperature range and voltage specifications. Cross-reference with Renesas's official obsolescence notices for alternative recommendations.