RTC-72423A:2

Real Time Clock Overview

The RTC-72423A:2 is a surface-mount real-time clock module manufactured by Epson Timing. It utilizes a parallel interface and operates within a supply voltage range of 4.5V to 5.5V. The device features a built-in crystal unit, eliminating the need for external oscillator adjustments. Key electrical characteristics include a frequency precision of ±20 ppm at +25°C and a maximum current consumption of 10 µA at VDD = 5V. It supports both 24-hour and 12-hour time formats with automatic Gregorian leap year adjustment. The component is housed in a 24-pin SOP package and is designed for operation across an extended temperature range.

Real Time Clock Feature Summary

• Built-in crystal unit for adjustment-free operation
• Automatic leap year setting (Gregorian calendar)
• Switchable 24-hour or 12-hour time format
• Low power consumption (max 10 µA @ 5V)

Real Time Clock Applications

• Car multimedia systems
• Body electronics
• Remote keyless entry systems

Real Time Clock Procurement Notes

Verify the specific ordering suffix ':2' against official Epson documentation, as standard listings typically reference 'PURE SN'. Confirm availability status, as this series may be subject to discontinuation notices. Ensure compatibility with existing PCB footprints for the 24-SOP package before procurement.

Real Time Clock Selection Notes

Select the RTC-72423A variant over the B variant if a tighter frequency tolerance of ±20 ppm is required compared to ±50 ppm. Ensure the design accommodates the 4.5V to 5.5V supply voltage range. Verify that the parallel interface signals (D0-D3, A0-A3, CS, RD, WR) align with the host microcontroller capabilities.

Real Time Clock Part Context

This component belongs to the RTC-72423 series, which serves as a successor to the older RTC-6242 series. While functionally similar, the 7242 series does not guarantee complete pin-for-pin compatibility with the 6242 series. Engineers replacing legacy parts must consult the latest technical manuals to verify signal definitions and timing requirements.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. Replacement from the RTC-6242 series requires verification of technical information due to lack of complete compatibility.