Real Time Clock/Calendar/Alarm with EEPROM

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

• 2Kbytes of EEPROM

   - 64-byte page write mode

   - 3-bit Block Lock™ protection

• 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

• Small package options

   - 8-lead SOIC package, 8-lead TSSOP package