1337CSRI8

Overview

The Renesas 1337CSRI8 is a Real-Time Clock (RTC) integrated circuit featuring an I2C serial interface. It provides clock/calendar functionality with leap-year compensation valid up to the year 2100. The device counts seconds, minutes, hours, day, date, month, and year in either 24-hour or 12-hour format with AM/PM indication. It operates within a voltage range of 1.8 V to 5.5 V and supports industrial temperature ranges. The component includes two programmable time-of-day alarms and a programmable square-wave output that defaults to 32 kHz upon power-up.

Feature Summary

• Integrated calendar logic automatically adjusts for varying month lengths and leap years without external intervention.
• Dual programmable alarms allow for precise event triggering based on specific time intervals.
• I2C bus compatibility ensures efficient data transfer using standard address and data protocols.

Applications

• Industrial control systems requiring accurate timekeeping
• Consumer electronics with battery backup needs
• Data logging equipment tracking timestamps

Procurement Notes

Verify the exact suffix against official Renesas documentation to confirm package type and temperature grade. Confirm RoHS compliance status as it may vary by production batch. Check current availability through authorized distributors as lead times can fluctuate. Ensure the ordering code matches the required I2C mode specifications for your design.

Selection Notes

Select this component when a low-power RTC with I2C connectivity is required. Consider the operating voltage range compatibility with your system's supply rails. Evaluate the need for dual alarms versus single-alarm alternatives. Verify that the SOIC-16 package fits your PCB layout constraints compared to smaller packages.

Part Context

This part belongs to the Renesas 1337 series of real-time clocks. The series offers various packaging options including MSOP, SOIC, and QFN. The 1337CSRI8 specifically utilizes a surface-mount package with an integrated crystal option, simplifying board design by removing the need for external oscillator components.

Replacement Considerations

Check for direct pin-to-pin replacements within the same Renesas family. Verify electrical parameter compatibility before substituting with other manufacturers' RTCs. Ensure the replacement supports the same I2C protocol and voltage levels.