RTC-62423A:3:ROHS

Real Time Clock Overview

The EPSON RTC-72423A:3:ROHS is a real-time clock module housed in a 24-pin SOP package. It integrates a crystal unit for adjustment-free operation and supports a supply voltage range of 4.5 V to 5.5 V. The device features a CMOS interface with parallel data lines (D0-D3) and control signals including /CS0, ALE, /RD, and /WR. It provides Gregorian calendar functionality with automatic leap year adjustment and selectable 12-hour or 24-hour time formats. The operating temperature range extends from -40 °C to +85 °C, with a typical current consumption of 5 µA at 2 V.

Real Time Clock Feature Summary

• Integrated crystal unit eliminates external oscillator requirements
• Automatic Gregorian calendar calculation including leap years
• Selectable 12-hour or 24-hour time format
• Parallel interface with 4-bit data output

Real Time Clock Applications

• General electronic equipment requiring precise timekeeping
• Industrial systems needing extended temperature stability
• Embedded controllers utilizing parallel bus architectures

Real Time Clock Procurement Notes

Verify the specific suffix ':3:ROHS' against official Seiko Epson documentation to confirm packaging quantity and environmental compliance status. Ensure the design accounts for the distinct pinout differences compared to legacy RTC-6242 series components. Confirm availability through authorized distribution channels as direct manufacturer contact may be required for specific ordering codes.

Real Time Clock Selection Notes

Select this model when a parallel interface is preferred over serial alternatives like I2C or SPI. The integrated crystal simplifies PCB layout by removing external oscillator components. Consider the 24-pin SOP footprint constraints during mechanical design. Verify that the system logic levels match the specified VIH/VIL thresholds for reliable communication.

Real Time Clock Part Context

This component belongs to the RTC-7242 series, which serves as a successor to the older RTC-6242 family. While functionally similar, the datasheet explicitly notes that complete compatibility does not exist between the two generations. Engineers migrating from the 6242 series must review the updated technical manual to address pin configuration and electrical characteristic changes.

Real Time Clock Replacement Considerations

Direct replacement with the RTC-6242 series is not guaranteed due to documented incompatibility. Evaluate the RTC-72421A variant if a DIP-18 package is required instead of the SOP-24 form factor. Cross-referencing with other manufacturers requires careful verification of interface protocols and timing specifications.