1339AC-31CSRGI

Overview

The Renesas 1339AC-31CSRGI is a Real-Time Clock (RTC) with an embedded crystal, packaged in a 16-pin SOIC. It features a Fast mode I2C serial interface for address and data transfer. The device counts seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100. It includes two programmable time-of-day alarms, a programmable square-wave output, and an oscillator stop flag. Automatic power-fail detection switches to backup supply. Operating voltage ranges from 2.5V to 5.5V. Battery current is 300nA. Time keeping current is 1.4µA. Frequency accuracy is ±20 ppm. Industrial temperature range is -40°C to +85°C.

Feature Summary

• Integrated crystal oscillator eliminates external components
• Automatic power-fail detect and switch circuitry maintains time during outages
• Leap-year compensation valid up to 2100 ensures accurate long-term tracking
• Trickle-charge capability supports backup battery management

Applications

• Wireless electronic game tables
• Smart three-phase electricity meters
• Smart single-phase electricity meters

Procurement Notes

Verify the exact suffix CSRGI against official Renesas documentation to confirm pinout and package dimensions. Confirm availability status as distribution channels may list obsolete or limited stock items. Check moisture sensitivity level requirements for surface-mount assembly processes. Ensure compatibility with 2.5V to 5.5V supply rails in the target design.

Selection Notes

Select this component when a low-power RTC with integrated crystal is required for industrial environments. The I2C interface simplifies connectivity with microcontrollers. Verify that the 16-pin SOIC package fits the PCB layout constraints. Consider the ±20 ppm accuracy for applications not requiring high-precision timing without external calibration.

Part Context

The 1339 series represents a family of serial real-time clocks designed for low-power clock/date applications. This specific part integrates the crystal oscillator, reducing board space. It is manufactured by Renesas Electronics Corporation, formerly IDT. The device falls under the Real-Time Clocks product category within the Clock & Timer ICs sub-category.

Replacement Considerations

Check for direct substitutes within the 1339 series such as 1339C-31SRI8. Verify pin compatibility and electrical specifications before substitution. Consult Renesas for updated lifecycle notifications regarding end-of-life products.