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

• 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

• 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