1337DCGI

Overview

The Renesas 1337DCGI is a low-power serial real-time clock (RTC) device featuring an I2C serial interface. It tracks time including seconds, minutes, hours, day, date, month, and year, with automatic leap-year compensation valid up to the year 2100. The device supports both 24-hour and 12-hour formats with AM/PM indication. It operates within a supply voltage range of 1.8 V to 5.5 V and is designed for industrial temperature applications ranging from -40°C to +85°C. The component is housed in an 8-pin MSOP surface-mount package.

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 for battery backup monitoring

Applications

• Utility Meters
• HVAC Equipment
• Audio/Video Components
• Set-Top Boxes and Televisions
• Network Routers, Hubs, Switches, and Bridges

Procurement Notes

Verify the specific suffix 'DCGI' against the manufacturer's official datasheet to confirm pinout compatibility and functional equivalence with standard DS1337 replacements. Confirm moisture sensitivity levels and reflow soldering profiles prior to assembly. Ensure the supply chain documentation matches the exact part number to avoid confusion with similar variants in the 1337AGD series.

Selection Notes

Select this component when a low-power RTC with dual alarms and I2C connectivity is required for space-constrained designs. The 8-pin MSOP package suits applications needing minimal board area. Verify that the system voltage falls within the 1.8 V to 5.5 V operating range. Consider the industrial temperature rating if the environment exceeds commercial limits. Check if integrated crystal packages are needed instead of external crystal solutions.

Part Context

The 1337DCGI belongs to the 1337G family of real-time clocks manufactured by Renesas Electronics. This family is functionally equivalent to the Maxim DS1337, offering pin compatibility. The device integrates calendar functions and alarm capabilities into a small form factor, targeting embedded systems requiring accurate timekeeping without complex microcontroller overhead.

Replacement Considerations

The ISL12057 is a functionally equivalent and pin-compatible alternative. Both devices support I2C interfaces and dual alarms. Verify voltage ranges and package dimensions before substitution. Cross-reference with Maxim DS1337 specifications for direct compatibility checks.