RX-8025SA:AA:ROHS

Real Time Clock Overview

The RX-8025SA:AA:ROHS is a Real-Time Clock (RTC) IC manufactured by Epson Timing, belonging to the RX-8025SA series. It features an I2C bus interface for communication and supports date formats of YY-MM-DD-dd and time formats of HH:MM:SS in both 12-hour and 24-hour modes. The device operates within a supply voltage range of 1.7 V to 5.5 V and functions across a temperature range of -40°C to +85°C. It is housed in a 14-SOP package with a width of 5.00 mm. Key functional features include alarm capabilities, calendar functions, and leap year compensation. This specific variant is marked as obsolete and no longer in production.

Real Time Clock Feature Summary

• I2C Bus Interface: Supports standard two-wire serial communication protocol.
• Calendar Functionality: Includes automatic leap year compensation up to 2099.
• Wide Voltage Range: Operates from 1.7 V to 5.5 V with low current consumption.
• Alarm Features: Provides programmable alarm interrupts for system wake-up or events.

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping.
• Consumer electronics with battery backup requirements.
• Data logging devices needing accurate timestamping.
• Embedded systems utilizing I2C communication buses.

Real Time Clock Procurement Notes

This component is officially discontinued and no longer manufactured by Epson Timing. Sourcing new units directly from the manufacturer is not possible. Designers should verify the availability of alternative packages or updated series variants if continuing production is required. Existing stock may be available through third-party distributors but is subject to limited quantities and potential obsolescence risks.

Real Time Clock Selection Notes

When selecting this RTC, ensure compatibility with the target system's I2C voltage levels, as the device supports 1.7 V to 5.5 V. Verify that the 14-SOP package dimensions fit the PCB layout constraints. Since the part is obsolete, consider evaluating newer Epson RTC models or cross-compatible alternatives that offer similar accuracy and interface specifications without discontinuation risks.

Real Time Clock Part Context

The RX-8025SA:AA:ROHS is part of the broader RX-8025SA family of real-time clocks. Variants within this series differ primarily in accuracy grades and packaging options. The ':AA' suffix typically denotes a specific accuracy grade and pin configuration, while ':ROHS' indicates compliance with Restriction of Hazardous Substances directives. This model represents an earlier generation of Epson's I2C RTC offerings.

Real Time Clock Replacement Considerations

Analog Devices Inc./Maxim Integrated DS1307+ is listed as a similar replacement option. Engineers should compare pinouts, register maps, and power consumption characteristics between the RX-8025SA:AA:ROHS and the DS1307+ before substitution to ensure functional equivalence in the target application.