X1226 Xicor, X1226 Datasheet

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X1226

Manufacturer Part Number
X1226
Description
Real Time Clock/Calendar with EEPROM
Manufacturer
Xicor
Datasheet

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4K (512 x 8)
FEATURES
• Real Time Clock/Calendar
• 2 Polled Alarms (Non-volatile)
• Oscillator Compensation on chip
• Battery Switch or Super Cap Input
• 512 x 8 Bits of EEPROM
• High Reliability
• 2-Wire™ Interface interoperable with I2C*
• Frequency Output (SW Selectable: Off, 1Hz,
• Low Power CMOS
• Small Package Options
BLOCK DIAGRAM
REV 1.1.24 1/13/03
*I2C is a Trademark of Philips.
PHZ/IRQ
—Tracks time in Hours, Minutes, and Seconds
—Day of the Week, Day, Month, and Year
—Settable on the Second, Minute, Hour, Day of
—Repeat Mode (periodic interrupts)
—Internal feedback resistor and compensation
—64 position Digitally Controlled Trim Capacitor
—6 digital frequency adjustment settings to
—64-Byte Page Write Mode
—8 modes of Block Lock™ Protection
—Single Byte Write Capability
—Data Retention: 100 years
—Endurance: 100,000 cycles per byte
—400kHz data transfer rate
4096Hz or 32.768kHz)
—1.25µA Operating Current (Typical)
—8-Lead SOIC and 8-Lead TSSOP
the Week, Day, or Month
capacitors
±30ppm
SCL
SDA
32.768kHz
Interface
Decoder
Serial
Select
X1
X2
8
Decode
Control
Logic
Real Time Clock/Calendar with EEPROM
(EEPROM)
Registers
Control/
Oscillator
Compensation
OSC
Repetitive Alarms &
Temperature Compensation
www.xicor.com
X1226
Frequency
Divider
Registers
(SRAM)
New Features
Status
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,
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.
1Hz
Alarm
Calendar
Timer
Logic
oscillator
Characteristics subject to change without notice.
Compare
Alarm Regs
EEPROM
(EEPROM)
ARRAY
Registers
Keeping
(SRAM)
Time
4K
compensation,
2-Wire
Circuitry
Battery
Switch
and
battery
RTC
V
V
1 of 24
CC
BACK

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