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