RX-4801JE:UB

Real Time Clock Overview

The EPSON RX-4801JE:UB is a serial-interface real-time clock module featuring a built-in frequency-adjusted 32.768 kHz crystal unit and DTCXO. It utilizes a 4-wire serial interface with an operating voltage range of 1.6 V to 5.5 V, while temperature compensation functions within the 2.2 V to 5.5 V range. The device provides full calendar, alarm, and timer capabilities, alongside a 32.768 kHz CMOS frequency output on the FOUT pin. Encased in a VSOJ-20 package, it supports interrupt generation via an open-drain /INT pin and operates across a wide temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• Built-in 32.768 kHz-DTCXO for high stability without external frequency adjustment
• 4-wire serial interface supporting data transfer via DI, DO, CLK, and CE pins
• Frequency tolerance of ±5.0 × 10⁻⁶ over the -40°C to +85°C operating range
• Configurable timer function ranging from 1/4096 second to 255 minutes

Real Time Clock Applications

• General electronic equipment requiring precise timekeeping
• Network environments utilizing broadband or ubiquitous applications
• Digital convergence systems for consumer electronics

Real Time Clock Procurement Notes

Verify the specific ordering suffix against official Epson Toyocom documentation to confirm exact stability grades and packaging options. Confirm that the VDD supply voltage meets the minimum requirements for temperature-compensated operation if high accuracy is required across extreme temperatures.

Real Time Clock Selection Notes

Select this model when a 4-wire serial interface is preferred over I2C or SPI protocols. Ensure the design accommodates the VSOJ-20 footprint dimensions (7.0mm x 6.0mm). Consider the UB stability grade if the application demands ±5.0 × 10⁻⁶ accuracy across the full industrial temperature range.

Real Time Clock Part Context

This component belongs to the RX-4801 series, which includes the SA variant housed in a SOP-14 package. Both variants share identical electrical characteristics and internal architecture but differ in physical form factor and pinout configuration to suit different PCB layout constraints.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Engineers should consult official Epson Toyocom documentation for cross-reference information or alternative models within the RX-4801 family.