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X1228 Datasheet(PDF) 1 Page - Xicor Inc.

Part No. X1228
Description  Real Time Clock/Calendar/CPU Supervisor with EEPROM
Download  31 Pages
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Maker  XICOR [Xicor Inc.]
Homepage  http://www.xicor.com
Logo XICOR - Xicor Inc.

X1228 Datasheet(HTML) 1 Page - Xicor Inc.

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REV 1.3 3/24/04
Characteristics subject to change without notice.
1 of 31
www.xicor.com
4K (512 x 8)
2-WireRTC
Real Time Clock/Calendar/CPU Supervisor 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
• CPU Supervisor Functions
—Power On Reset, Low Voltage Sense
—Watchdog Timer (SW Selectable: 0.25s, 0.75s,
1.75s, off)
• 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
— 14-Lead SOIC and 14-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
X1228
BLOCK DIAGRAM
X1
X2
Oscillator
Frequency
Timer
Logic
Divider
Calendar
8
Control/
Registers
1Hz
Time
Keeping
Registers
Alarm Regs
Compare
RESET
Control
Decode
Logic
Alarm
(EEPROM)
(EEPROM)
SCL
SDA
Serial
Interface
Decoder
4K
EEPROM
ARRAY
Watchdog
Timer
Low Voltage
Reset
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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