DESCRIPTION

The X1240 is a Real Time Clock with clock/calendar circuits. The dual port clock register allows the clock to operate, without loss of accuracy, even during read and write operations.

FEATURES

? 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

—1,000,000 Endurance Cycles

—Guaranteed Data Retention: 100 Years

? Small Package Options

—8-Lead SOIC Package, 8L TSSOP Package