DS1308 - Maxim Integrated

DS1308 Low-Current I2C RTC

The DS1308 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV RAM. Address and data are transferred serially through an I2C interface. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with few.

Features

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● Compatible with Crystal ESR Up to 100kΩ Allows a Crystal to be Optimized for Cost and Space
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● Low-Power Operation Extends Battery Backup Run Time
• Low Timekeeping Current of 250nA (typ)
• Automatic Power-Fail Detect and Switch Circuitry
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● Completely Manages All Timekeeping Functions
• Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2400
• External Clock Source for Synchronization Clock Reference (e.g., 32kHz, 50Hz/60Hz Powerline, GPS 1PPS)
• 56-Byte, Battery-Backed, General-Purpose RAM with U.