Table of Contents Section 1 – New and Featured Products

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CPU Supervisors, System Management, RTC and Timing Solution Products ® X1205, X1226, X1227, X1228, X1286, X1288 Real Time Clock with Systems Management Product Highlights Real time clock integrated with power-on-reset, low voltage sense, watchdog timer, battery switch, EEPROM and oscillator compensation and trim cap. Key Features Keeps time/date – like a watch plus calendar • Sub-second resolution • 100-year calendar • Updates for leap year Powerful alarm architecture • Two independent alarms (EEPROM) • Alarms can be set for second, minute, hour, data, month and day of the week • Makes alarm reports Selectable timeout watchdog timer (WDT) • Four field selectable time intervals of, 0.25s, 0.75s, 1.75s • Watchdog timer can be disabled for system debug Benefits • Simple, easy to use – reduces design time • Software development is easy • Alarms act as interrupts • Sets repetitive/recursive alarms • Restarts system if system locks up • System controller can be put in sleep mode and WDT can periodically wake-up system • Resets critical system peripherals Description The Real Time Clock Family contains clock/calendar, two polled alarms, oscillator compensation, and battery backup switch. See the table for options. The oscillator uses an external, low-cost 32.768kHz crystal. All compensation and trim components are integrated on the chip. This eliminates several external discrete components and a trim capacitor, saving board area and component cost. The Real Time Clock keeps track of time with separate registers for Hours, Minutes, and Seconds. The Calendar has separate registers for Date, Month, Year and Day-of-week. The calendar is correct through 2099, with automatic leap year correction. The powerful Dual Alarms can be set to any Clock/Calendar value for a match. For instance, every minute, every Tuesday, or 5:23 AM on March 21. The alarms can be polled in the Status Register or provide a hardware interrupt (IRQ Pin). There is a repeat mode for the alarms allowing a periodic interrupt. The device offers a backup power input pin. This V BACK pin allows the device to be backed up by battery or Super Cap. The device is fully operational from 2.7 to 5.5 volts and the clock/calendar portion of the device remains fully operational down to 1.8 volts (Standby Mode). See Product Family Tree on page 2-9 New & Featured Products X1288 Block Diagram 32kHz or 32.768kHz PHZ IRQ X1 X2 Select Oscillator Frequency Divider 1Hz Timer Calendar Logic Timer Keeping Registers (SRAM) Battery Switch Circuitry V CC V BACK SCL SDA Serial Interface Decoder Control Decode Logic 8 Control Registers (EEPROM) Status Registers (SRAM) Alarm Mask Compare Alarm Regs (EEPROM) Oscillator Compensation RESET Watchdog Timer Low Voltage Reset 256K EEPROM Array www.xicor.com 1–1
CPU Supervisors, System Management, RTC and Timing Solution Products ® X1205, X1226, X1227, X1228, X1286, X1288 Real Time Clock with Systems Management Real Time Clock PLUS Family — 2-wire Bus Interface Products Package V cc V batt Operating Range 2 Alarms Power-ON Watchdog Clock On-chip OSC Temp Batt Switch or IRQ EEPROM 0 to 70 -40 to 85 Reset Timer Freq Out Compensation Super Cap Output 0K 4K 16K 64K 256K X1205 RTC Plus, 8-TSSOP, 2.7 to 5.5 1.8 to 5.5 X X Y N N N Y Y Y X No Memory 8-SOIC X1226 RTC Plus, 8-SOIC, 2.7 to 5.5 1.8 to 5.5 X X Y N N Y Y Y Y X 4K EEPROM 8-TSSOP X1227 RTC Plus, 8-SOIC, 2.7 to 5.5 1.8 to 5.5 X X Y Y Y N Y Y N X 4K EEPROM 8-TSSOP X1228 RTC Plus, 14-SOIC, 2.7 to 5.5 1.8 to 5.5 X X Y Y Y Y Y Y Y X 4K EEPROM 14-TSSOP X1286 RTC Plus, 14-TSSOP 2.7 to 5.5 1.8 to 5.5 X X Y N N Y Y Y Y X 256K EEPROM X1288 RTC Plus, 16-SOIC, 2.7 to 5.5 1.8 to 5.5 X X Y Y Y Y Y Y Y X 256K EEPROM 14-TSSOP 1–2 www.xicor.com
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