RTC-4574NB:B ROHS

Real Time Clock Overview

The EPSON RTC-4574NB:B ROHS is a Real Time Clock (RTC) IC belonging to the RTC-4574 series. It features a 3-wire serial interface and supports date formats of YY-MM-DD-dd and time formats of HH:MM:SS in 24-hour mode. The device operates within a supply voltage range of 1.6V to 5.5V, with a typical backup current of 0.35µA at 3V. It includes built-in frequency-adjusted 32.768 kHz crystal units and offers functions such as full calendar, alarm, timer, and a selectable 32.768 kHz frequency output on the C-MOS FOUT pin. The component is housed in a 14-SOP package and operates between -40°C and +85°C.

Real Time Clock Feature Summary

• Built-in frequency adjusted 32.768 kHz crystal unit
• 3-wire serial interface for data communication
• Low backup current consumption of 0.35µA (typ.) at 3V
• Supports full calendar, alarm, and timer functions

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping
• Consumer electronics with battery backup requirements
• Data logging devices needing calendar and alarm capabilities

Real Time Clock Procurement Notes

Verify the specific suffix 'B' against official Epson documentation to confirm exact packaging and compliance status. Confirm availability as this part number may be subject to discontinuation notices. Ensure the selected variant matches the required 14-SOP package dimensions and lead pitch for PCB layout compatibility.

Real Time Clock Selection Notes

Select this model if a 3-wire serial interface is preferred over I2C or SPI. Ensure the system voltage falls within the 1.6V to 5.5V operating range. Consider the 0.35µA backup current for battery life calculations. Verify that the 14-SOP package fits the available board space compared to other series variants like LC or SA.

Real Time Clock Part Context

This component is part of the Epson RTC-4574 family, which provides various package options including SOP, VSOJ, and SON types. The NB suffix typically denotes a specific package configuration within this series. Other members include RTC-4574SA and RX-4574LC, sharing similar core functionalities but differing in physical footprint and interface pinouts.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Check for discontinued status notifications from Epson Timing. Evaluate alternative RTCs with compatible 3-wire serial interfaces and similar voltage ranges if direct replacement is unavailable.