DESCRIPTION
The X1227 device is a Real Time Clock with clock/calendar, two polled alarms with integrated 512x8 EEPROM, oscillator compensation, CPU Supervisor (POR/LVS and WDT) and battery backup switch.

FEATURES
• Real Time Clock/Calendar
   — Tracks time in Hours, Minutes, and Seconds
   — 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 settings 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
• 4K x 8 Bits of EEPROM
   — 64-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
• 2-Wire™ Interface interoperable with I2C*
   — 400kHz data transfer rate
• Low Power CMOS
   — 1.25µA Operating Current (Typical)
• Small Package Options
   — 8-Lead SOIC and 8-Lead TSSOP

APPLICATIONS
• Utility Meters
• HVAC Equipment
• Audio / Video Components
• Set Top Box / Television
• Modems
• Network Routers, Hubs, Switches, Bridges
• Cellular Infrastructure Equipment
• Fixed Broadband Wireless Equipment
• Pagers / PDA
• POS Equipment
• Test Meters / Fixtures
• Office Automation (Copiers, Fax)
• Home Appliances
• Computer Products
• Other Industrial / Medical / Automotive