X1243

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
   -<1A Operating CurrentmA Operating Current
   -<3mA Active Current during Program
   -<400A 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

Pinout




Specifications

Temperature Under Bias..........................-65°C to +135°C
Storage Temperature...............................-65°C to +150°C
Voltage on any pin with respect to ground.......-1.0V to 7.0V
DC Output Current .......................................................5 mA
Lead Temperature (Soldering, 10 Seconds) .... .........300°C


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.
The clock/calendar provides functionality that is controllable and readable through a set of registers. The clock, using a low cost 32.768kHz crystal input, accurately tracks the time in seconds, minutes, hours, date, day, month and years.The X1243 has leap year correction, automatic adjustment for the year 2000 and months with less than 31 days.
An alarm match of the RTC sets an interrupt flag and activates an interrupt pin. An alternative alarm function provides a pulsed interrupt for long time constant timebases.
The X1243 offers a backup power input pin. This Vback pin allows the device to be backed up by a nonrechargeable battery. The RTC is fully operational from 1.8 to 5.5 volts.
The X1243 provides a 2K byte EEPROM array, giving a safe, secure memory for critical user and configuration data. This memory is unaffected by complete failure of the main and backup supplies.