RTC-62421A:ROHS

Real Time Clock Overview

The EPSON RTC-62421A:ROHS is a 4-bit parallel interface Real Time Clock module housed in an 18-pin DIP package. It integrates a crystal unit for adjustment-free operation and supports Gregorian calendar functions with automatic leap year adjustments. The device operates within a supply voltage range of 4.5V to 5.5V, consuming typical current of 10µA at 5V. It features a frequency precision of ±10 ppm at +25°C and maintains functionality across an operating temperature range of -10°C to +70°C.

Real Time Clock Feature Summary

• Integrated crystal unit eliminates the need for external frequency adjustment
• Supports 24-hour or 12-hour time formats with automatic Gregorian leap year calculation
• Parallel bus interface with 4-bit data lines (D0-D3) and standard control signals
• High frequency stability with ±10 ppm precision at room temperature

Real Time Clock Applications

• General-purpose electronic equipment requiring precise timekeeping
• Industrial control systems needing reliable calendar functions
• Embedded devices utilizing parallel bus architectures

Real Time Clock Procurement Notes

Verify that the specific ordering suffix matches the required environmental compliance standards. Confirm the package type corresponds to the 18-pin DIP configuration. Ensure the frequency accuracy class meets the system's timing requirements before procurement.

Real Time Clock Selection Notes

Select this model when a parallel interface is preferred over serial alternatives. The ±10 ppm accuracy makes it suitable for applications demanding higher precision than standard ±50 ppm variants. Verify that the -10°C to +70°C operating range aligns with the target environment.

Real Time Clock Part Context

This component belongs to the RTC-7242 series, which serves as a successor to the older RTC-6242 series. While functionally similar, the 7242 series does not guarantee complete pin-to-pin compatibility with the 6242 series. Designers migrating from the 6242 series must consult the latest technical documentation to ensure proper integration.

Real Time Clock Replacement Considerations

The RTC-72421B is available as a variant with ±50 ppm frequency precision. The RTC-72423A offers the same performance metrics but utilizes a 24-pin SOP package instead of the 18-pin DIP form factor.