Real Time Clock IC

RTC stands for real-time clock, which is an integrated circuit that functions essentially like a watch. Because it works together with the battery, it can maintain operation for a long time even without power, and even if the microcontroller is reprogrammed, it can track progress for a long time.

RTC devices are used in many applications to provide accurate dates and times. For example, an IBM PC motherboard uses an RTC device, which includes a battery that can maintain date and time even without power. In addition, RTC devices are also used for certain microcontrollers, while other devices require interfaces. The most widely used real-time clock RTC models currently include MCP7940N-I/SN, DS1307Z, DS1302Z, ISL1208IB8Z, DS1390U-33, M41T0M6F, and DS1390U. Let's gain a deeper understanding of RTC by introducing these chips.

The DS1307Z is a versatile clock/calendar IC packed in an 8-SOIC surface-mount package. It operates between 4.5V to 5.5V and has a battery range of 2V to 3.5V. Its features, like leap year and NVSRAM, cater to various applications. Created by Analog Devices Inc./Maxim Integrated, it offers 56B storage for reliable timekeeping.

Following is the MCP7940N-I/SN, a precision clock/calendar IC in an 8-SOIC package. Operating from 1.8V to 5.5V (battery 1.3V to 5.5V), it includes alarms, leap year support, and 64B memory. Low timing current (1.2μA @ 3.3V) makes it power-efficient, with compatibility for I²C and 2-wire serial interfaces.

The next one is M41T0M6F, a precision clock chip in a compact 8-SOIC package. Operating from 3V to 5.5V, it ensures accuracy with minimal power consumption across -40°C to 85°C. HK XRS TECHNOLOGY LIMITED stocks this extensively for immediate availability.

Besides, ISL1208IB8Z is also a great real-time clock IC, operating from 2.7V to 5.5V (battery 1.8V to 5.5V), it supports various functions, including alarms and leap year, with minimal power consumption (4μA to 6μA at 3V to 5V).

Overall, RTC's functions cover recording time, determining dates and weeks, providing precise clock signals, setting alarms and timers, recording battery status, etc., and providing accurate time and date information for various applications that require time synchronization.

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