MAXIM DS1338Z-3+

The DS1338 serial real-time clock (RTC) is a lowpower, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. 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 fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The DS1338 has a built-in powersense circuit that detects power failures and automatically switches to the backup supply, maintaining time and date operation

• Completely Manages All Timekeeping Functions
• RTC Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100
• 56-Byte, Battery-Backed, GeneralPurpose RAM with Unlimited Writes
• Programmable Square-Wave Output Signal
• Surface-Mount Package with an Integrated Crystal (DS1338C) Saves Additional Space and Simplifies Design
• Interfaces with Most Microcontrollers
• I2C Serial Interface
• Low-Power Operation Extends Battery Backup Run Time
• Automatic Power-Fail Detect and Switch Circuitry
• -40°C to ±85°C Industrial Temperature Range
• Supports Operation in a Wide Range of Applications
• Underwriters Laboratories (UL) Recognized

• Handhelds (GPS, POS Terminal)
• Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance)
• Office Equipment (Fax/Printer, Copier)
• Medical (Glucometer, Medicine Dispenser)
• Telecommunications (Router, Switcher, Server)
• Other (Utility Meter, Vending Machine, Thermostat, Modem)