1337AGCSRGI8

Overview

The Renesas 1337AGCSRGI8 is a Real-Time Clock (RTC) IC featuring an I2C serial interface. It operates within a supply voltage range of 1.8 V to 5.5 V and utilizes a 32 kHz external crystal oscillator. The device provides timekeeping for seconds, minutes, hours, day, date, month, and year, including leap-year compensation valid up to the year 2100. It supports both 24-hour and 12-hour formats with AM/PM indicators. The component is housed in an 8-pin MSOP package and is designed for industrial temperature ranges.

Feature Summary

• I2C Serial Interface supporting Normal and Fast modes
• Two programmable time-of-day alarms
• Programmable square-wave output defaulting to 32 kHz on power-up
• Oscillator Stop Flag functionality

Applications

• Industrial control systems requiring precise time synchronization
• Consumer electronics needing low-power real-time tracking
• Data logging equipment with date and timestamp requirements

Procurement Notes

Verify the specific suffix 'CSR' against official Renesas documentation to confirm pinout compatibility and feature set differences compared to standard variants like 'GDV'. Ensure the ordering suffix matches the required package type and temperature grade. Confirm availability through authorized distributors as stock levels fluctuate.

Selection Notes

Select this component when an I2C-connected RTC with wide voltage tolerance (1.8V–5.5V) is required. The 8-pin MSOP package suits space-constrained designs. Verify that the system design includes a 32 kHz crystal if using the non-integrated version, or confirms internal oscillator support if applicable to the specific sub-variant.

Part Context

This part belongs to the 1337G series of low-power serial real-time clocks. The series is characterized by its ability to automatically adjust for month lengths and leap years. It is distinct from microcontroller-based timing solutions by offering dedicated hardware timekeeping with minimal software overhead via the I2C bus.

Replacement Considerations

Direct replacements include other parts from the 1337G family such as the 1337AGDVGI8, provided the package and electrical specifications match. Cross-reference with other I2C RTCs only if pinouts and voltage ranges are compatible.