1337GDCGI

Overview

The Renesas 1337GDCGI is a low-power serial real-time clock (RTC) integrated circuit designed for precise timekeeping in electronic systems. It operates within a supply voltage range of 1.8V to 5.5V and utilizes a 32kHz crystal oscillator for accurate frequency generation. The device features an I2C serial interface for communication with host microcontrollers, supporting standard and fast-mode protocols. It provides calendar functionality including leap-year compensation and includes two programmable time-of-day alarms alongside a programmable square-wave output. Packaged in an SOIC-8 surface-mount format, it ensures reliable operation across industrial temperature ranges.

Feature Summary

• Supports YY-MM-DD-dd calendar formats with automatic leap-year adjustment
• Includes two independent programmable time-of-day alarms
• Features a programmable square-wave output pin
• Utilizes I2C serial interface for data exchange

Applications

• Industrial control systems requiring precise time stamping
• Consumer electronics needing battery-backed timekeeping
• Embedded systems with limited power budgets
• Data logging devices requiring calendar accuracy

Procurement Notes

Verify the specific suffix 'CGI' corresponds to the SOIC-8 package and commercial/industrial temperature grade as defined in the official Renesas datasheet. Confirm that the ordering part number matches the exact voltage and interface requirements for your design. Check for any recent Product Change Notifications (PCN) regarding package or material updates before finalizing procurement plans.

Selection Notes

Select this component when a low-power RTC with I2C interface and dual alarms is required. Ensure the system voltage falls within the 1.8V to 5.5V operating range. Consider the SOIC-8 footprint constraints during PCB layout. Verify compatibility with the host controller's I2C speed capabilities and check if the available square-wave output meets timing reference needs.

Part Context

The 1337GDCGI belongs to the IDT/Renesas 1337G series of real-time clocks. This family is known for integrating calendar functions and alarm capabilities into a compact serial interface package. It serves as a successor or alternative to earlier RTC designs, offering improved power efficiency and simplified integration through the I2C bus compared to parallel interfaces.

Replacement Considerations

Check for direct cross-references such as the IDT1337GD variant. Verify pinout compatibility and electrical specifications against potential substitutes from other manufacturers like Microchip or Maxim Integrated. Ensure that any replacement maintains the same I2C protocol support and voltage range.