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-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