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Product Detailed Parameters
- Description：IC RTC CLK/CALENDAR I2C 22SON
- Series：RX-8581NB
- Package：Strip
- Mfr：EPSON
- Type：Clock/Calendar
- Features：Alarm
- Memory Size：-
- Time Format：-
- Date Format：-
- Interface：I2C
- Voltage - Supply：1.8V ~ 5.5V
- Voltage - Supply, Battery：-
- Current - Timekeeping (Max)：0.8µA ~ 1.2µA @ 3V ~ 5V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Package / Case：22-LFDFN
- Supplier Device Package：22-SON (6.3x4.8)
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Overview
The EPSON RX-8581NB:B is a Real-Time Clock (RTC) IC from the RX-8581NB series, manufactured by Epson Timing. It features an I2C-BUS interface for communication and utilizes a SON-22 package with 22 pins. The component supports date formats including YY-MM-DD-dd and time formats in HH:MM:SS (24-hour). It operates within a supply voltage range of 1.8V to 5.5V and functions across a temperature range of -40°C to +85°C. The device includes alarm and leap year features. Current status indicates the product is End-of-Life (EOL), meaning it will be discontinued by the manufacturer.
Feature Summary
- I2C-BUS serial interface for clock/calendar data access
- SON-22 package (6.3mm x 5.0mm x 1.4mm)
- Supply voltage range: 1.8V to 5.5V
- Operating temperature: -40°C to +85°C
Applications
- General embedded systems requiring precise timekeeping
- Industrial equipment operating in wide temperature ranges
- Consumer electronics utilizing I2C communication protocols
Procurement Notes
This component is designated as End-of-Life (EOL) by Epson Timing. Manufacturers have issued discontinuance notifications indicating that production will cease. Availability is limited to existing stock or last-time buys. Verification of current lifecycle status through official Epson documentation is required before integration into new designs due to potential supply constraints.
Selection Notes
Designers should consider the EOL status when selecting this part. The RX-8581NB series offers I2C connectivity and a compact SON-22 footprint suitable for space-constrained applications. Ensure compatibility with the 1.8V to 5.5V supply range and verify that the SON-22 package dimensions fit the PCB layout requirements. Alternative components from the same family or newer generations may need evaluation for long-term projects.
Part Context
The RX-8581NB:B belongs to the RX-8581NB series of real-time clocks. It shares characteristics with other models in the NB package variant, such as the RX-8571NB. The series is designed for applications needing accurate timekeeping via standard I2C interfaces. The specific suffix 'B' denotes the I2C-BUS interface configuration within this package type.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided source material. Due to the End-of-Life status, engineers must consult Epson Timing for recommended replacements or evaluate compatible RTCs with similar I2C interfaces and SON-22 packaging.
