1338AC-31SRGI

Overview

The Renesas 1338AC-31SRGI is a Real-Time Clock (RTC) IC featuring an integrated I2C serial interface and non-volatile SRAM. It provides clock/calendar functionality with leap-year compensation valid up to the year 2100. The device operates within a supply voltage range of 1.8V to 5.5V for main power and 1.3V to 3.7V for battery backup. It includes two programmable time-of-day alarms, a programmable square-wave output, and an oscillator stop flag. The component is housed in a 16-SOIC package and supports industrial temperature ranges.

Feature Summary

• Integrated real-time clock and calendar with automatic date adjustments for varying month lengths and leap years.
• Dual alarm capability allowing for programmable time-of-day event triggers.
• Automatic power-fail detection circuitry that seamlessly switches between main and backup power supplies.
• Trickle-charge capability designed to maintain backup battery health without external components.

Applications

• Industrial control systems requiring precise timekeeping under variable power conditions
• Data logging equipment needing persistent timestamping during power outages
• Embedded consumer electronics utilizing low-power serial communication interfaces

Procurement Notes

Verify component authenticity through authorized distributors due to potential obsolescence or lifecycle changes. Confirm specific suffix requirements against current datasheets as manufacturing processes may evolve. Ensure compatibility with existing PCB footprints and voltage levels before integration into new designs.

Selection Notes

Select this component when a robust RTC with integrated memory and dual-alarm features is required. It is suitable for applications demanding high reliability during power transitions. Consider alternative packages if space constraints differ from the 16-SOIC form factor.

Part Context

This part belongs to the IDT/Renesas 1338 series of serial real-time clocks. These devices are engineered for low-power operation and feature I2C connectivity. The series is widely used in embedded systems where accurate time tracking and data retention are critical operational requirements.

Replacement Considerations

Direct substitutes include the DS1338C-18# from Analog Devices/Maxim Integrated. Verify pinout and electrical specifications match before replacement.