X1226
4k (512x8), 2-Wire™ RTC; Real Time Clock/Calendar with EEPROM

Key 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)

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.

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