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1
FN8102.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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X1288
2-Wire RTC Real Time
Clock/Calendar/CPU Supervisor with
EEPROM
FEATURES
Real Time Clock/Calendar
— Tracks time in Hours, Minutes, Seconds and
Hundredths of a Second
— 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 setting 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
32K x 8 Bits of EEPROM
— 128-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, 100Hz,
or 32.768kHz)
Low Power CMOS
— 1.25A Operating Current (Typical)
Small Package Options
— 16-Lead SOIC and 14-Lead TSSOP
Pb-Free Plus Anneal Available (RoHS Compliant)
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
BLOCK DIAGRAM
X1
X2
Oscillator
Frequency
Timer
Logic
Divider
Calendar
8
Control/
Registers
1Hz
Time
Keeping
Registers
Alarm Regs
Compare
Ma
s
k
RESET
Control
Decode
Logic
Alarm
(EEPROM)
SCL
SDA
Serial
Interface
Decoder
256K
EEPROM
ARRAY
Watchdog
Timer
Low Voltage
Reset
Registers
Status
(SRAM)
Select
PHZ/IRQ
VCC
VBACK
32.768kHz
(SRAM)
Battery
Circuitry
Switch
OSC
Compensation
Data Sheet
April 14, 2006