RX-8581SA:B

Real Time Clock Overview

The Epson RX-8581SA:B is a Real Time Clock (RTC) IC featuring an I2C bus interface. It operates within a supply voltage range of 3 V and supports an operating temperature range of -40°C to +85°C. The device provides clock/calendar functions with alarm capabilities and includes automatic leap year adjustment. It utilizes a 32.768 kHz clock frequency output with a duty cycle of 50 ± 5%. The component is housed in a 14-SOIC package, measuring approximately 10.1 mm in length, 7.4 mm in width, and 3.2 mm in height, with a pin count of 14.

Real Time Clock Feature Summary

• Integrated real-time clock and calendar functionality with alarm features
• Supports I2C serial communication interface for data exchange
• Includes automatic leap year adjustment mechanism
• Provides 32.768 kHz clock frequency output

Real Time Clock Applications

• General purpose timekeeping in embedded systems
• Data logging applications requiring accurate timestamping
• Consumer electronics with calendar display requirements
• Industrial equipment needing reliable time reference

Real Time Clock Procurement Notes

Verify the specific ordering suffix, such as :B or :B3:ROHS, against the manufacturer's official documentation to ensure compatibility with required packaging and environmental standards. Confirm that the 14-SOIC package dimensions align with the target PCB footprint. Ensure the I2C address configuration meets system design constraints before procurement.

Real Time Clock Selection Notes

Select this component when a dedicated RTC with calendar functions and I2C connectivity is required. Consider the -40°C to +85°C operating temperature range for suitability in industrial or automotive environments. Verify that the 3 V supply voltage matches the system power architecture. Check if the specific alarm IRQ function is necessary for the application logic.

Real Time Clock Part Context

The RX-8581SA belongs to Epson's timing product family, specifically designed as a real-time clock module. It is part of the RX-8581 series, which offers various package options and interface configurations. This model represents a standard solution for maintaining timekeeping in digital systems without requiring external crystal oscillators for the main clock source.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult Epson's official cross-reference guides or distributor catalogs for potential alternatives. Ensure any replacement maintains I2C compatibility and similar package dimensions.