RX4901CE XS D0B

Real Time Clock Overview

The Epson RX4901CE XS D0B is a real-time clock (RTC) module featuring a built-in frequency-adjusted 32.768 kHz crystal unit and a Digital Temperature Compensated Crystal Oscillator (DTCXO). It supports 3-wire or 4-wire SPI bus interfaces and includes an auto power switching circuit for seamless transition between main and backup supplies. The device offers a timestamp function capable of storing up to 32 records, multiple interrupt outputs including wake-up timers and alarms, and self-monitoring capabilities for crystal oscillation stop and voltage drops.

Real Time Clock Feature Summary

• Built-in 32.768 kHz DTCXO with high stability: ±3.0 ppm from -40°C to +85°C
• SPI Bus Interface: Compatible with 3-wire or 4-wire serial communication protocols
• Timestamp Function: Stores up to 32 time-stamp records for event logging
• Auto Power Switching: Automatically switches to backup power upon VDD/VBAT monitoring

Real Time Clock Applications

• Industrial equipment requiring precise timekeeping in varying temperatures
• Data logging systems utilizing the internal timestamp buffer
• Battery-powered devices leveraging low current consumption and backup switching

Real Time Clock Part Context

This component belongs to the RX4901CE series of real-time clocks manufactured by Epson Timing. The 'XS' designation indicates the extended stability grade, while 'D0' typically refers to specific packaging or tape-and-reel configuration variants within the product line. It is categorized under Clock & Timer ICs.

Real Time Clock Replacement Considerations

Direct replacements must match the RX4901CE form factor and SPI interface. Verify that substitute components support the required ±3.0 ppm stability over the -40°C to +85°C range and offer compatible pinouts for SOP-14 or VSOJ-12 packages if applicable.