Preliminary Information
New Features
Repetitive Alarms &
Temperature Compensation
X1205
Real Time Clock/Calendar
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
• 2-Wire™ Interface interoperable with I2C*
—400kHz data transfer rate
• Low Power CMOS
—1.25µA Operating Current (Typical)
• Small Package Options
—8-Lead SOIC and 8-Lead TSSOP
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2-Wire
™
RTC
•
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Utility Meters
HVAC Equipment
Audio / Video Components
Set Top Box / Television
BLOCK DIAGRAM
PR
EL
I
Oscillator
APPLICATIONS
M
OSC
Compensation
Frequency
Divider
1Hz
Timer
Calendar
Logic
32.768kHz
X1
X2
IN
A
DESCRIPTION
Status
Registers
(SRAM)
Alarm
The X1205 device is a Real Time Clock with clock/
calendar, two polled alarms, 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.
The Real-Time Clock keeps track of time with separate
registers for Hours, Minutes, and Seconds. The
Calendar has separate registers for Date, Month, Year
and Day-of-week. The calendar is correct through
2099, with automatic leap year correction.
R
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
Y
Alarm
Time
Keeping
Registers
(SRAM)
Mask
8
Interrupt Enable
SCL
SDA
Serial
Interface
Decoder
Control
Decode
Logic
Control
Registers
(EEPROM)
Compare
Alarm Regs
(EEPROM)
IRQ
*I2C is a Trademark of Philips.
REV 1.0.9 8/29/02
www.xicor.com
Characteristics subject to change without notice.
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XICOR [ XICOR INC. ]
