DESCRIPTION

The X1243 is a Real Time Clock with clock/calendar circuits and two alarms. The dual port clock and alarm registers allow the clock to operate, without loss of accuracy, even during read and write operations.

FEATURES

? 2 Alarms—Interrupt Output

—Settable on the Second, 10s of Seconds, Minute, 10s of Minutes, Hour, Day, Month, or Day of the Week

—Repeat alarm for time base generation

? 2 Wire Interface interoperable with I2C.

—400kHz data transfer rate

? Secondary Power Supply Input with internal switch-over circuitry.

? Year 2000 Compliant

? 2K bytes of EEPROM

—64 Byte Page Write Mode

—3 bit Block Lock

? Low Power CMOS

—<1μA Operating Current

—<3mA Active Current during Program

—<400μA Active Current during Data Read

? Single Byte Write Capability

? Typical Nonvolatile Write Cycle Time: 5ms

? High Reliability

—100,000 Endurance Cycles

—Guaranteed Data Retention: 100 Years

? Small Package Options

—8-Lead SOIC Package, 8L TSSOP Package