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X1226 Datasheet, PDF (1/24 Pages) Xicor Inc. – Real Time Clock/Calendar with EEPROM | |||
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4K (512 x 8)
New Features
Repetitive Alarms &
Temperature Compensation
X1226
Real Time Clock/Calendar with EEPROM
2-Wire⢠RTC
FEATURES
⢠Real Time Clock/Calendar
âTracks time in Hours, Minutes, and Seconds
â Day of the Week, Day, Month, and Year
⢠2 Polled Alarms (Non-volatile)
âSettable on the Second, Minute, Hour, Day of
the Week, Day, or Month
âRepeat Mode (periodic interrupts)
⢠Oscillator Compensation on chip
âInternal feedback resistor and compensation
capacitors
â64 position Digitally Controlled Trim Capacitor
â6 digital frequency adjustment settings to
±30ppm
⢠Battery Switch or Super Cap Input
⢠512 x 8 Bits of EEPROM
â64-Byte Page Write Mode
â8 modes of Block Lock⢠Protection
âSingle Byte Write Capability
⢠High Reliability
âData Retention: 100 years
âEndurance: 100,000 cycles per byte
⢠2-Wire⢠Interface interoperable with I2C*
â400kHz data transfer rate
⢠Frequency Output (SW Selectable: Off, 1Hz,
4096Hz or 32.768kHz)
⢠Low Power CMOS
â1.25µA Operating Current (Typical)
⢠Small Package Options
â8-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
⢠Ofï¬ce 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.
BLOCK DIAGRAM
X1
32.768kHz
X2
PHZ/IRQ
Select
SCL
SDA
Serial
Interface
Decoder
Control
Decode
Logic
8
*I2C is a Trademark of Philips.
REV 1.1.24 1/13/03
OSC
Compensation
Oscillator
Frequency 1Hz
Divider
Timer
Calendar
Logic
Time
Keeping
Registers
(SRAM)
Control/
Registers
(EEPROM)
Status
Registers
(SRAM)
Alarm
Compare
Alarm Regs
(EEPROM)
4K
EEPROM
ARRAY
Battery
Switch
Circuitry
VCC
VBACK
www.xicor.com
Characteristics subject to change without notice. 1 of 24
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