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X1226

Xicor
Part Number X1226
Manufacturer Xicor
Description Real Time Clock/Calendar with EEPROM
Published Apr 17, 2005
Detailed Description New Features Repetitive Alarms & Temperature Compensation 4K (512 x 8) X1226 Real Time Clock/Calendar with EEPROM 2-W...
Datasheet PDF File X1226 PDF File

X1226
X1226

Overview
New Features Repetitive Alarms & Temperature Compensation 4K (512 x 8) X1226 Real Time Clock/Calendar with EEPROM 2-Wire™ RTC 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 BLOCK DIAGRAM OSC Compensation X1 Frequency Divider 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 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.
32.
768kHz X2 Oscillator 1Hz Timer Calendar Logic Time Keeping Registers (SRAM) ...


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