RTC-72421A: PURE SN

Real Time Clock Overview

The RTC-72421A: PURE SN is a Real-Time Clock (RTC) integrated circuit manufactured by Seiko Epson Corporation. It belongs to the RTC-7242 series and features a parallel interface for clock and calendar functions. The device supports both 12-hour and 24-hour time formats with a specified accuracy of 50ppm. It operates within a supply voltage range of 4.5V to 5.5V and is available in an 18-pin Dual In-line Package (DIP). The component includes leap year compensation capabilities and is designed for industrial temperature ranges.

Real Time Clock Feature Summary

• Parallel interface supporting 12/24 hour time formats
• Integrated calendar function with leap year compensation
• Operating temperature range from -40°C to +85°C
• Supply voltage range of 4.5V to 5.5V

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping
• Data logging equipment
• Telecommunications infrastructure

Real Time Clock Procurement Notes

Verify the specific suffix ':PURE SN' against official Seiko Epson documentation to confirm lead-free compliance status. Ensure the parallel interface requirements match the target system design, as this component does not utilize serial interfaces like I2C or SPI. Cross-reference the 18-DIP package dimensions with PCB footprint specifications prior to procurement.

Real Time Clock Selection Notes

Select this component when a parallel interface is required for high-speed data access compared to serial RTCs. Verify that the system power supply remains stable within the 4.5V to 5.5V range. Consider the 50ppm accuracy specification against environmental temperature variations across the -40°C to +85°C operating range to ensure timing precision meets application requirements.

Real Time Clock Part Context

This part is part of the broader RTC-7242 family produced by Seiko Epson Corporation. Variants such as the RTC-72421B and RTC-72423A share similar core functionalities but differ in package types and pin counts. The ':PURE SN' designation typically indicates specific material composition standards, distinct from standard commercial versions.

Real Time Clock Replacement Considerations

Direct replacements include other variants within the Epson RTC-7242 series, such as the RTC-72421B, provided the package and interface compatibility are verified. Alternative manufacturers offering parallel RTCs may require significant schematic and firmware modifications due to differing register maps and control signals.