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