X1226
®
™
4K (512 x 8), 2-Wire RTC
Data Sheet
September 15, 2005
FN8098.2
APPLICATIONS
Real Time Clock/Calendar with EEPROM
• Utility Meters
FEATURES
• 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
• 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
• Other Industrial / Medical / Automotive
• Battery Switch or Super Cap Input
• 512 x 8 Bits of EEPROM
DESCRIPTION
—64-Byte Page Write Mode
The X1226 device is a Real Time Clock with
clock/calendar, two polled alarms with integrated
512x8 EEPROM, oscillator compensation, and battery
backup switch.
—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)
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.
• 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)
BLOCK DIAGRAM
OSC
Compensation
X1
Timer
Calendar
Logic
Battery
Switch
Circuitry
Time
Keeping
Registers
VCC
Frequency
Divider
1Hz
Oscillator
32.768kHz
VBACK
X2
Select
(SRAM)
PHZ/IRQ
Status
Control/
Control
Decode
Logic
Compare
Serial
Interface
Decoder
Registers
SCL
SDA
Registers
Alarm
(EEPROM)
(SRAM)
Alarm Regs
(EEPROM)
8
4K
EEPROM
ARRAY
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2005. All Rights Reserved
1
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