X1227S8Z-4.5A

Overview

The X1227S8Z-4.5A is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation, housed in an 8-SOIC surface-mount package. It provides clock/calendar functionality with time formats of HH:MM:SS (12/24-hour) and date formats of YY-MM-DD-dd. The device supports I2C and 2-wire serial interfaces for data communication. Key features include an alarm function, leap year compensation, a monitor, and a watchdog timer. It operates within a supply voltage range of 2.7V to 5.5V, with a backup supply range of 1.8V to 5.5V. The maximum current consumption during timing is 10µA to 20µA at 2.7V to 5V. The component is rated for industrial temperatures from -40°C to 85°C.

Feature Summary

• Integrated Real-Time Clock with Calendar (YY-MM-DD-dd) and Alarm capabilities
• Supports I2C and 2-Wire Serial Interfaces
• Includes Watchdog Timer and Voltage Monitor functions
• Operates on 2.7V to 5.5V main supply and 1.8V to 5.5V backup supply

Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment needing calendar and alarm functions
• Embedded systems utilizing I2C or 2-wire serial buses
• Applications requiring low-power real-time tracking with battery backup

Procurement Notes

Verify the specific suffix '4.5A' against official Renesas documentation to confirm threshold or variant specifications, as generic listings may not detail all suffix variations. Confirm availability status, as similar models in this series are marked as obsolete. Ensure the 8-SOIC package dimensions match the design footprint requirements.

Selection Notes

Select this component when both RTC and supervisory functions are required in a single package. Compare power consumption figures (10µA–20µA) against system budget constraints. Verify that the host microcontroller supports either I2C or 2-wire serial protocols. Check if the operating temperature range of -40°C to 85°C meets environmental specifications.

Part Context

This part belongs to the X1227 series of Real-Time Clocks from Renesas. It shares functional similarities with other parts in the family but differs in interface support and specific feature sets like the watchdog timer. It is distinct from the X1205 series, which lacks the monitor and watchdog features found in the X1227 line.

Replacement Considerations

Check for direct pin-to-pin replacements within the X1227 series. Verify compatibility of the I2C/2-wire interface with existing firmware. Consider newer Renesas RTCs if the X1227 series is discontinued, ensuring feature parity for alarms and watchdog timers.