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