RTC-62421B:ROHS

Real Time Clock Overview

The RTC-62421B:ROHS is a Real Time Clock module manufactured by Seiko Epson Corporation, housed in an 18-pin DIP package. It features a built-in crystal unit for adjustment-free operation and supports both 24-hour and 12-hour formats with automatic Gregorian calendar leap year adjustments. The device operates on a single 5V supply with low current consumption of 10 µA maximum at VDD=5V. Frequency precision is ±50 ppm at +25°C, with temperature characteristics ranging from -10°C to +70°C. Note that the 7242 series lacks complete compatibility with the older RTC-6242 series.

Real Time Clock Feature Summary

• Built-in crystal unit allows for adjustment-free efficient operation
• Supports 24h/12h time format changeable via hardware control
• Automatic leap year adjustment for Gregorian calendar
• Low power consumption: Max 10 µA at VDD = 5V

Real Time Clock Applications

• General electronic equipment requiring timekeeping
• Data logging systems
• Embedded controllers needing calendar functions

Real Time Clock Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to ensure compliance with environmental directives such as RoHS. Confirm pinout compatibility if replacing legacy components, as the 7242 series is not fully compatible with the 6242 series. Check for automotive qualification requirements if deploying in vehicle-related applications.

Real Time Clock Selection Notes

Select this component when a parallel interface real-time clock with a built-in oscillator is required. Ensure the system voltage matches the 5V standard specified. Consider the operating temperature range (-10°C to +70°C) relative to the application environment. Verify that the 4-bit data bus interface aligns with the host microcontroller's capabilities.

Real Time Clock Part Context

This part belongs to the RTC-72421/72423 series produced by Seiko Epson Corporation. The 'B' suffix typically denotes specific frequency precision or packaging variations within the product line. The ':ROHS' suffix indicates compliance with the EU RoHS directive regarding restricted hazardous substances.

Real Time Clock Replacement Considerations

The datasheet explicitly states that the 7242 series does not have complete compatibility with the old RTC-6242 series. Engineers must consult the latest technical manual before substituting these parts to avoid interface or functional mismatches.