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X1226S8I データシート(PDF) 1 Page - Xicor Inc.

部品番号 X1226S8I
部品情報  Real Time Clock/Calendar with EEPROM
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メーカー  XICOR [Xicor Inc.]
ホームページ  http://www.xicor.com
Logo XICOR - Xicor Inc.

X1226S8I データシート(HTML) 1 Page - Xicor Inc.

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REV 1.1.24 1/13/03
Characteristics subject to change without notice.
1 of 24
www.xicor.com
4K (512 x 8)
2-WireRTC
Real Time Clock/Calendar with EEPROM
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
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.
X1226
BLOCK DIAGRAM
X1
X2
Oscillator
Frequency
Timer
Logic
Divider
Calendar
8
Control/
Registers
1Hz
Time
Keeping
Registers
Alarm Regs
Compare
Control
Decode
Logic
Alarm
(EEPROM)
(EEPROM)
SCL
SDA
Serial
Interface
Decoder
4K
EEPROM
ARRAY
Registers
Status
(SRAM)
Select
PHZ/IRQ
VCC
VBACK
32.768kHz
(SRAM)
Battery
Circuitry
Switch
OSC
Compensation
*I2C is a Trademark of Philips.
New Features
Repetitive Alarms &
Temperature Compensation


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