1338-18DCGI8

Overview

The Renesas 1338-18DCGI8 is an active Real-Time Clock (RTC) IC featuring a clock/calendar function and battery-backed non-volatile SRAM. It utilizes an I2C, 2-wire serial interface for communication. The device operates with a main supply voltage of 3.3V to 5.5V and supports a backup battery voltage range of 1.3V to 3.7V. It includes 56 bytes of NVSRAM storage capacity. The component is housed in an 8-SOIC package with dimensions of 4.9 x 3.9 x 1.5 mm and a pitch of 1.27 mm. It supports time formats including HH:MM:SS (12/24 hour) and date formats YY-MM-DD-dd.

Feature Summary

• Integrated 56-byte Non-Volatile SRAM for data retention during power loss
• I2C, 2-wire serial interface for system connectivity
• Supports leap year correction and square wave output
• Operates within -40°C to 85°C temperature range

Applications

• General purpose real-time clocking in embedded systems
• Data logging applications requiring timestamp preservation
• Battery-powered devices needing low-power timekeeping

Procurement Notes

Verify the specific suffix 'DCGI8' against official Renesas documentation to confirm package type and environmental compliance. Ensure compatibility with system I2C voltage levels and check for lead-free status if required by local regulations. Confirm availability through authorized distributors as stock levels fluctuate.

Selection Notes

Select this component when a small-footprint RTC with integrated non-volatile memory is required. The 8-SOIC package suits space-constrained designs. Verify that the 56-byte SRAM capacity meets application data storage needs. Ensure the I2C interface speed matches the host microcontroller capabilities.

Part Context

This part belongs to the Renesas 1338 series of real-time clocks. It shares functional similarities with other variants like the 1338-31DCGI8 but may differ in specific pin configurations or feature sets defined by the suffix. The series is designed for cost-effective timekeeping solutions in consumer and industrial electronics.

Replacement Considerations

Direct substitutes include other parts from the 1338 family such as the 1338-31DCGI8, provided pinout and feature compatibility are verified. Check datasheets for differences in SRAM size or interface specifications before substitution.