Real Time Clock/Calendar/Alarm with EEPROM

描述 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.

特性 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