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