RTC-72423B:3

Real Time Clock Overview

The EPSON RTC-72423B:3 is a real-time clock module featuring a built-in crystal unit for adjustment-free operation. It supports parallel interface communication and provides Gregorian calendar functionality with automatic leap year adjustments. The device operates within a supply voltage range of 4.5V to 5.5V and consumes a maximum current of 10µA at 5V. It is housed in a 24-SOP package and functions reliably across an operating temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• Built-in crystal unit eliminates the need for external frequency adjustment
• Automatic leap year adjustment for Gregorian calendar
• Switchable 12-hour or 24-hour time format
• Low power consumption of up to 10µA at VDD=5V

Real Time Clock Applications

• General electronic equipment requiring precise timekeeping
• Industrial control systems
• Consumer electronics with calendar functions

Real Time Clock Procurement Notes

Verify the specific ordering suffix ':3' against official Epson documentation, as standard listings often reference ':PURE SN'. Confirm availability status, as this series may be subject to discontinuation notices. Ensure compatibility with existing parallel bus designs when sourcing replacements.

Real Time Clock Selection Notes

Select the RTC-72423B variant over the A variant if tighter frequency precision is required, though both share similar electrical characteristics. Ensure the design accommodates the 24-pin SOP footprint and parallel interface requirements. Verify that the system logic levels align with the specified input/output voltage thresholds.

Real Time Clock Part Context

This component belongs to the RTC-72421/72423 series, which serves as an evolution of the older RTC-6242 series. Users replacing legacy parts must consult the latest technical manuals to address compatibility differences between the generations.

Real Time Clock Replacement Considerations

Direct substitution from the RTC-6242 series requires verification of pinout and functional differences. Consult the manufacturer's replacement guide to ensure signal integrity and timing compliance.

Real Time Clock FAQ

Does the RTC-72423B require external frequency trimming?

No, the module includes a built-in crystal unit, allowing for adjustment-free efficient operation.

What is the maximum current consumption?

The maximum current consumption is 10µA when the supply voltage (VDD) is 5V.

Is the RTC-72423B compatible with the RTC-6242 series?

The datasheet notes that the 7242 series does not have complete compatibility with the old RTC-6242 series; technical information should be confirmed before replacement.