Analog Devices DS1307 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. The RTC transfers address and data serially through an I2C, bidirectional bus. The clock/calendar on the DS1307 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 on the Analog Devices RTC operates in either the 24-hour or 12-hour format with AM/PM indicator. The DS1307 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply. Timekeeping operation continues while the part operates from the backup supply.
Features
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 2100
56-Byte, Battery-Backed, General-Purpose RAM with Unlimited Writes
Programmable Square-Wave Output Signal
Simple Serial Port Interfaces to Most Microcontrollers
I2C Serial Interface
Low Power Operation Extends Battery Backup Run Time
Consumes Less than 500nA in BatteryBackup Mode with Oscillator Running
Automatic Power-Fail Detect and Switch Circuitry
8-Pin DIP and 8-Pin SO Minimizes Required Space
Optional Industrial Temperature Range: -40°C to +85°C Supports Operation in a Wide Range of Applications
