RTC-72421B: PURE SN

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The RTC-72421B is a pure silicon real-time clock (RTC). It is designed to maintain a permanent and accurate clock even when the main power is switched off. This feature makes it a useful and reliable addition to any system that requires a reliable time or date reference. This article will discuss the application fields and working principles of the RTC-72421B.

Application fields

The RTC-72421B is a low-level real-time clock, suitable for a wide range of applications. It is particularly useful in embedded systems where a reliable time or date reference is required. Common applications include computer systems and embedded controllers, data logging systems, alarm systems, and power failure detection systems.

In addition, it is also suitable for use in industrial and metering applications such as energy measurement, supervisory control and data acquisition (SCADA) systems, and automatic generation control (AGC). It is also well-suited for applications in healthcare, telecommunications, military and aerospace.

Working principles

The RTC-72421B is a highly accurate and reliable real-time clock which features a temperature-compensated crystal oscillator, low power consumption and low standby current. The clock module is driven by an 8-bit microprocessor which controls the programmable real-time clock registers, a watchdog timer and an interrupt. The accuracy of the time provided by the clock is maintained by the quartz crystal oscillator.

The crystal oscillator has a frequency accuracy of ±25ppm, which means that the clock will maintain an accuracy of ±0.8sec/day (or ±1sec/day over three years). This accuracy is maintained over a wide temperature range of -40°C to +85°C. The RTC-72421B has a low-battery detector and a low-battery indicator which will alert the user when the power source voltage drops below the threshold.

The RTC-72421B also has a protected register which allows the user to set the time and date without losing the accuracy of the clock. Furthermore, the RTC-72421B is programmable for output frequency, time-intervals and calendar features such as annual leap year, century and weekday cycle.

The RTC-72421B is also a highly reliable clock, with an estimated mean time between failures (MTBF) of 1 million hours. This makes it suitable for use in mission-critical applications where a reliable time reference is mandatory.

Conclusion

The RTC-72421B is a highly accurate and reliable pure silicon real-time clock. It is a low-level clock, suitable for a wide range of applications, including embedded systems, SCADA systems, energy measurement systems, alarm systems, and power failure detection systems. Its accuracy is maintained by a temperature-compensated crystal oscillator and it has low power consumption and low standby current. Furthermore, it also has a protected register, a low-battery detector and a low-battery indicator. All these features make the RTC-72421B an ideal choice for systems which require an accurate and reliable real-time clock.

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