1339-31DCGI

Overview

The Renesas 1339-31DCGI is a real-time clock (RTC) IC featuring an I2C serial interface. It operates with core voltages of 2.5V, 3.3V, 5V, or 5.5V and supports battery supply from 1.3V to 3.7V. The device utilizes an external crystal input at 32.768 kHz and provides LVCMOS output signals. Initial frequency accuracy is specified at ±10 PPM. It functions within a temperature range of -40°C to 85°C and is housed in an 8-pin SOIC package.

Feature Summary

• I2C Serial Interface for communication
• LVCMOS Output Type
• External Crystal Input (32.768 kHz)
• Initial Frequency Accuracy: ±10 PPM

Applications

• Real-time clocking in embedded systems
• Data logging applications requiring precise timekeeping
• Industrial control systems operating in extended temperatures

Procurement Notes

Verify component authenticity through authorized channels. Confirm RoHS compliance status and moisture sensitivity level (MSL 1) prior to assembly. Check for product change notifications regarding manufacturing site updates. Ensure packaging integrity matches reel or tube specifications as required by the specific order configuration.

Selection Notes

Select this part when an I2C-compatible RTC with high initial frequency accuracy is required. Verify that the system voltage aligns with the 2.5V to 5.5V core supply range. Ensure the design accommodates an external 32.768 kHz crystal oscillator. Consider the 8-pin SOIC footprint for PCB layout constraints.

Part Context

This component belongs to the 1339 series of real-time clocks manufactured by Renesas Electronics. It serves as a dedicated timing solution for digital systems needing calendar and timekeeping functions via a standard two-wire serial bus. The device integrates logic for maintaining time data without continuous main power when supported by a backup battery source.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.