1339-31DCGI8

Overview

The Renesas 1339-31DCGI8 is a low-power serial real-time clock (RTC) IC featuring an I2C interface. It provides timekeeping for seconds, minutes, hours, day, date, month, and year with automatic leap-year compensation valid until 2100. The device supports both 12-hour and 24-hour formats and includes two programmable time-of-day alarms and a programmable square-wave output. It operates within a supply voltage range of 2.5V to 5.5V and maintains functionality via an automatic power-fail detect and switch circuitry that utilizes a backup supply. The component is housed in an 8-pin SOIC package.

Feature Summary

• I2C Serial Interface: Supports fast mode for efficient data transfer of address and time/date information.
• Automatic Calendar Correction: Automatically adjusts for months with fewer than 31 days and leap years.
• Power-Fail Detection: Built-in circuit detects power failures and automatically switches to backup supply.
• Dual Alarms: Features two programmable time-of-day alarms for system event triggering.

Applications

• Wireless gaming tables requiring precise timing synchronization.
• Smart three-phase electricity meters with bidirectional communication capabilities.
• Smart single-phase electricity meters supporting tamper detection and isolation.

Procurement Notes

Verify the specific suffix 'DCGI8' against the manufacturer's current datasheet to confirm pinout and electrical specifications match the design requirements. Confirm moisture sensitivity level (MSL 1) and lead-free status during procurement planning. Check for product change notifications regarding assembly sites or wafer fabrication sources, as these may affect long-term availability without altering function.

Selection Notes

Select this component when an I2C-compatible RTC with integrated crystal inputs is required for industrial temperature ranges (-40°C to +85°C). Ensure the system design accommodates the 2.5V to 5.5V core voltage range. Verify that the 8-SOIC package dimensions (4.9 x 3.9 x 1.5 mm) fit the PCB layout constraints. Consider the trickle-charge capability if battery backup management is needed.

Part Context

This part belongs to the Renesas 1339 series of serial real-time clocks. It shares functional similarities with other variants in the family, such as the 1339C-31SRI8, but differs in packaging and specific electrical characteristics. The 1339 series is designed for applications requiring accurate timekeeping with minimal external components due to its integrated oscillator stop flag and power-sense circuits.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate cross-references based on I2C compatibility, package type (8-SOIC), and voltage specifications only after verifying technical equivalence through official manufacturer channels.