X1288 pdf datasheet (2-Wire

2-Wire™ RTC Real Time Clock/Calendar/CPU Supervisor with
EEPROM
FEATURES
• Real Time Clock/Calendar
—Tracks time in Hours, Minutes, Seconds and
Hundredths of a Second
—Day of the Week, Day, Month, and Year
• 2 Polled Alarms (Non-volatile)
—Settable on the Second, Minute, Hour, Day of the
Week, Day, or Month
—Repeat Mode (periodic interrupts)
• Oscillator Compensation on Chip
—Internal feedback resistor and compensation
capacitors
—64 position Digitally Controlled Trim Capacitor
—6 digital-frequency adjustment setting to
±30ppm
• CPU Supervisor Functions
—Power-on Reset, Low Voltage Sense
—Watchdog Timer (SW Selectable: 0.25s, 0.75s,
1.75s, off)
• Battery Switch or Super Cap Input
• 32K x 8 Bits of EEPROM
—128-Byte Page Write Mode
—8 modes of Block Lock™ Protection
—Single Byte Write Capability
• High Reliability
—Data Retention: 100 years
—Endurance: 100,000 cycles per byte