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X1203S8I Datasheet

  • X1203S8I

  • Real-Time Clock

  • 19頁(yè)

  • ETC

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X1203
Real Time Clock/Calendar/Alarm
FEATURES
鈥?2 alarms鈥攊nterrupt output
鈥擲ettable on the second, minute, hour, day,
month, or day of the week
鈥擱epeat alarm for time base generation
鈥?2-wire interface interoperable with I
2
C
鈥?00kHz data transfer rate
鈥?Secondary power supply input with internal
switch-over circuitry
鈥?Low power CMOS
鈥?lt;1碌A(chǔ) operating current
鈥?lt;3mA active current during program
鈥?lt;400碌A(chǔ) active current during data read
鈥?Typical nonvolatile write cycle time: 5ms
鈥?High reliability
鈥?Small package options
鈥?-lead SOIC package, 8-lead TSSOP package
DESCRIPTION
2-Wire
鈩?/div>
RTC
The X1203 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 鏗俛g 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
V
BACK
pin allows the device to be backed up by a non-
rechargeable battery. The RTC is fully operational from
2.7 to 5.5 Volts and the RTC portion of the X1203
device remains fully operational down to 1.8 Volts.
BLOCK DIAGRAM
X1
Oscillator
X2
Frequency
Divider
1Hz
Timer
Calendar
Logic
32.768kHz
Time
Keeping
Registers
(SRAM)
Mask
8
Interrupt Enable
Alarm
SCL
SDA
Serial
Interface
Decoder
Control
Decode
Logic
Control
Registers
(EEPROM)
Status
Registers
(SRAM)
Alarm
Compare
Alarm Regs
(EEPROM)
IRQ
REV 1.2.0 2/13/01
James Tsang
www.xicor.com
Characteristics subject to change without notice.
1 of 19

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