瑞萨电子 实时时钟 (RTC IC) 是超低功耗的时钟/日期器件，配有可编程的时段警报和可编程方波输出。 这些器件具有高抗噪和低电流消耗特性，采用 12/24 小时运行模式，可提供闰年自动更正及可编程方波输出功能，是各类设计应用的理想选择。

瑞萨电子的实时时钟 IC 能计算秒、分、小时、星期、日期、月和年，其闰年补偿有效期达到 2100 年。 这些器件拥有正常和快速模式 I2C 接口、两个时段警报、一个振荡器 停止标志、通电时默认为 32 kHz 的可编程方波输出及 1.8 至 5.5V 的工作电压。瑞萨电子 1338 实时时钟 IC 包括一个电池供电的 56-字节非易失性 RAM，用于存储数据。

关于实时时钟 (RTC IC)

实时时钟 IC (RTC IC) 是一种可跟踪当前时间和日期的集成电路，通常能够计算秒、分钟、小时、天、月、年（含闰年补偿）。 虽然该术语通常是指个人电脑、服务器和嵌入式系统中的器件，但实时时钟 IC 目前几乎存在于需要保持准确时间的任何电子器件中。 瑞萨电子的大部分实时时钟使用外部晶体振荡器，但有些则采用集成式振荡器以简化电路和减少物料清单 (BOM)。 在大多数情况下，振荡器'的频率为 32.768 kHz（正好为每秒 2^15 个周期），使其成为与二进制计数器电路配合使用的方便速率。

时钟和时序

产品选型表

    Processing table
    器件号
    Interface
    Alarms (#)
    Supply Voltage Vcc (Min) (V)
    Battery Backup
    Battery Seal
    CPU Supervisory Function POR
    Crystal Frequency Trimming
    Frequency Out Pin
    Battery Current (nA)
    Time Keeping Current (µA)
    SRAM
    Selectable Frequency Output
    Oscillator Compensation
    TRIP Voltage for POR
    Accuracy
    Other Functions
    1337AG
    Real-Time Clock With I2C Serial Interface    		 I2C 2 1.8 否 否 否 否 否 300 0.9 1 ±10 ppm
    1338
    Real-Time Clock With Battery Backed Non-Volatile RAM    		 I2C 0 1.8 否 否 否 否 否 300 1.4 56 Bytes 1 ±20 ppm
    1339
    Real-Time Clock With Serial I2C Interface    		 I2C 2 2 否 否 否 否 否 300 1.4 1 ±20 ppm
    ISL12008
    I2C Real Time Clock with Battery Backup Low Power RTC with Battery ReSeal™ Function    		 I2C 1 2.7 是的 是的 否 是的 是的 800 1.6 1 -94 to +140
    ISL12020M
    Real Time Clock with Embedded Crystal, ±5ppm Accuracy    		 I2C 1 2.7 是的 是的 否 是的 是的 1000 3.5 128 Bytes 15 -336 to +337 6 Select VTRIP Levels ±5 ppm
    Battery Status Monitor, Battery Switchover Time Stamp and more...
    ISL12022
    Low Power RTC with Battery-Backed SRAM and Embedded Temp Compensation ±5ppm with Auto Day Light Saving    		 I2C 1 2.7 是的 是的 否 是的 是的 1000 3.5 128 Bytes 15 -336 to +337 6 Select VTRIP Levels ±5 ppm
    Battery Status Monitor, Battery Switchover Time Stamp and more...
    ISL12022M
    Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving    		 I2C 1 2.7 是的 是的 否 是的 是的 1000 3.5 128 Bytes 15 -336 to +337 6 Select VTRIP Levels ±5 ppm
    Battery Status Monitor, Battery Switchover Time Stamp and more...
    ISL12022MA
    Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving    		 I2C 1 2.7 是的 是的 否 是的 是的 1000 3.5 128 Bytes 15 -336 to +337 6 Select VTRIP Levels ±5 ppm
    Battery Status Monitor, Battery Switchover Time Stamp and more...
    ISL12022MR5421
    Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving    		 I2C 1 2.7 是的 是的 否 是的 是的 1000 3.5 128 Bytes 15 -336 to +337 6 Select VTRIP Levels ±5 ppm
    Battery Status Monitor, Battery Switchover Time Stamp and more...
    ISL12026
    Real Time Clock/Calendar with I2C Bus™ and EEPROM    		 I2C 2 2.7 是的 是的 否 是的 是的 850 5 512x8-Bit EEPROM 3 -64 to +110
    ISL12026A
    Real Time Clock/Calendar with I2C Bus™ and EEPROM    		 I2C 2 2.7 是的 是的 否 是的 是的 850 5 512x8-Bit EEPROM 3 -64 to +110
    ISL12057
    Low Cost and Low Power I2C Real Time Clock/Calendar with Alarm Function and Dual IRQ Pins    		 I2C 2 1.4 否 否 是的 否 是的 0.5 4 Dual Alarms, Dual IRQs
    ISL12058
    Low Cost and Low Power I2C Bus™ Real Time Clock/Calendar Low Power and Low Cost RTC with Alarm Function    		 I2C 2 1.4 否 否 否 否 是的 0.5 4 Dual Alarms
    ISL1208
    I2C Real Time Clock/Calendar, Low Power RTC with Battery-Backed SRAM    		 I2C 1 2.7 是的 是的 否 是的 是的 400 1.2 2 Bytes 15 -94 to +140 Yes
    ISL1209
    Low Power RTC with Battery Backed SRAM and Event Detection    		 I2C 1 2.7 是的 是的 否 是的 是的 400 1.2 2 Bytes 15 -94 to +140 Yes Event Detect
    ISL1219
    Low Power RTC with Battery Backed SRAM and Event Detection    		 I2C 1 2.7 是的 是的 否 是的 是的 400 1.2 2 Bytes 15 -94 to +140 Event Detect, Time Stamp
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    Analog ICs Brochure
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