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X1243 Datasheet(PDF) 1 Page - Xicor Inc.

Part # X1243
Description  Real Time Clock/Calendar/Alarm with EEPROM
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X1243 Datasheet(HTML) 1 Page - Xicor Inc.

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©Xicor, Inc. 1994, 1995, 1996 Patents Pending
9900-3003.1 4/1/99
1
Characteristics subject to change without notice
16K
2-WireRTC
Real Time Clock/Calendar/Alarm with EEPROM
FEATURES
• 2 Alarms—Interrupt Output
—Settable on the Second, 10s of Seconds,
Minute, 10s of Minutes, Hour, Day, Month, or
Day of the Week
—Repeat alarm for time base generation
• 2 Wire Interface interoperable with I2C.
—400kHz data transfer rate
• Secondary Power Supply Input with internal
switch-over circuitry.
• Year 2000 Compliant
• 2K bytes of EEPROM
—64 Byte Page Write Mode
—3 bit Block Lock
• Low Power CMOS
—<1
µA Operating Current
—<3mA Active Current during Program
—<400
µA Active Current during Data Read
• Single Byte Write Capability
• Typical Nonvolatile Write Cycle Time: 5ms
• High Reliability
—100,000 Endurance Cycles
—Guaranteed Data Retention: 100 Years
• Small Package Options
—8-Lead SOIC Package, 8L TSSOP Package
DESCRIPTION
The X1243 is a Real Time Clock with clock/calendar
circuits and two alarms. The dual port clock and alarm
registers allow the clock to operate, without loss of
accuracy, even during read and write operations.
The clock/calendar provides functionality that is con-
trollable and readable through a set of registers. The
clock, using a low cost 32.768kHz crystal input, accu-
rately tracks the time in seconds, minutes, hours, date,
day, month and years. It has leap year correction,
automatic adjustment for the year 2000 and months
with less than 31 days.
An alarm match of the RTC sets an interrupt flag and
activates an interrupt pin. An alternative alarm function
provides a pulsed interrupt for long time constant time-
bases.
The device offers a backup power input pin. This
Vback pin allows the device to be backed up by a non-
rechargeable battery. The RTC is fully operational
from 1.8 to 5.5 volts.
The X1243 provides a 2K byte EEPROM array, giving
a safe, secure memory for critical user and configura-
tion data. This memory is unaffected by complete fail-
ure of the main and backup supplies.
BLOCK DIAGRAM
X1
X2
Oscillator
Frequency
Timer
Logic
Divider
Calendar
8
32.768kHz
Control
Registers
1Hz
Time
Keeping
Registers
Alarm Regs
Compare
IRQ
Control
Decode
Logic
Alarm
(EEPROM)
(EEPROM)
(SRAM)
SCL
SDA
Serial
Interface
Decoder
Interrupt Enable
16K
EEPROM
Array
Register
Status
(SRAM)
Alarm
Alarm
X1243


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