1337CSRI

Overview

The Renesas 1337CSRI is a low-power serial real-time clock (RTC) device featuring an I2C serial interface. It tracks time including seconds, minutes, hours, day of the week, date, month, and year with automatic leap-year compensation valid up to the year 2100. The device operates within a supply voltage range of 1.8 V to 5.5 V and supports industrial temperature ranges from -40°C to +85°C. Key functional features include two programmable time-of-day alarms and a programmable square-wave output that defaults to 32 kHz upon power-up. Address and data are transferred serially through the I2C bus, supporting both Normal and Fast modes.

Feature Summary

• I2C Serial Interface: Supports Normal and Fast modes for address and data transfer.
• Calendar Functionality: Tracks time with automatic adjustment for month lengths and leap years valid until 2100.
• Alarm System: Equipped with two programmable time-of-day alarms.
• Square-Wave Output: Programmable output defaulting to 32 kHz on power-up.

Applications

• Utility Meters
• HVAC Equipment
• Audio/Video Components

Procurement Notes

Verify the specific package variant (e.g., MSOP, SOIC, QFN) as the 1337G series offers multiple packaging options. Confirm availability status, as some variants may be discontinued or have extended lead times. Ensure the selected part number matches the required operating voltage and temperature range specifications for the target application environment.

Selection Notes

Select the 1337CSRI when a pin-compatible and functionally equivalent alternative to Maxim DS1337 is required. Choose this component for designs needing dual interrupt pins for frequency output and alarm events. Consider the available package options such as 8-lead MSOP, SOIC, or 16-lead QFN based on board space constraints and integration requirements.

Part Context

The 1337CSRI belongs to the Renesas 1337G family of real-time clocks. This family is designed as a low-cost, low-power solution for applications requiring accurate timekeeping via a simple I2C interface. The devices are often used in systems where battery backup is not integrated into the package but can be supported externally, providing robust calendar and alarm functions for consumer and industrial electronics.