Real Time Clock/Calendar with EEPROM

DESCRIPTION
The X1226 device is a Real Time Clock with clock/calendar, two polled alarms with integrated 512x8 EEPROM, oscillator compensation, and battery backup switch. 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.

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
• Battery Switch or Super Cap Input
• 512 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
• Frequency Output (SW Selectable: Off, 1Hz, 4096Hz or 32.768kHz)
• Low Power CMOS
   —1.25µA Operating Current (Typical)
• Small Package Options
   —8 Ld SOIC and 8 Ld TSSOP
• Repetitive Alarms
• Temperature Compensation
• Pb-Free Plus Anneal Available (RoHS Compliant)

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