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參數(shù)資料
| 型號： | X1242 |
| 英文描述： | Real Time Clock/Calendar/Alarms/CPU Supervisor(實時時鐘/日歷/鬧鐘/帶EEPROM的監(jiān)控) |
| 中文描述： | 實時時鐘/日歷/報警/ CPU監(jiān)控（實時時鐘/日歷/鬧鐘/帶EEPROM中的監(jiān)控） |
| 文件頁數(shù)： | 1/24頁 |
| 文件大?。?/td> | 119K |
| 代理商： | X1242 |
REV 1.1.3 10/15/00
Characteristics subject to change without notice.
1 of 24
www.xicor.com
Preliminary Information
16K
2-Wire
RTC
Real Time Clock/Calendar/Alarms/CPU Supervisor with EEPROM
FEATURES
Selectable watchdog timer (0.25s, 0.75s, 1.75s, off)
Power on reset (250ms)
Programmable low voltage reset
2 polled alarms
—Settable on the second, minutes, hour, day,
month, or day of the week
2-wire interface interoperable with I
—400kHz data transfer rate
Secondary power supply input with internal
switch-over circuitry
2Kbytes of EEPROM
—64-byte page write mode
—3-bit Block Lock
protection
Low power CMOS
—<1μA operating current
—<3mA active current–EEPROM program
—<400μA active current–EEPROM read
Single byte write capability
Typical nonvolatile write cycle time: 5ms
High reliability
Small package options
—8-lead SOIC package, 8-lead TSSOP package
2
C
DESCRIPTION
The X1242 is a Real Time Clock with calendar/CPU
supervisor circuits and two polled 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.
The X1242 provides a watchdog timer with 3 selectable
time out periods and off. The watchdog activates a
RESET pin when it expires. The reset also goes active
when V
CC
drops below a fixed trip point. There are two
alarms where a match is monitored by polling status bits.
The device offers a backup power input pin. This V
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.
BACK
The X1242 provides a 2Kbyte EEPROM array, giving a
safe, secure memory for critical user and configuration
data. This memory is unaffected by complete failure of
the main and backup supplies.
BLOCK DIAGRAM
X1
X2
Oscillator
Frequency
Divider
Timer
Calendar
Logic
8
32.768kHz
Control/
Registers
(EEPROM)
1Hz
Time
Keeping
Registers
(SRAM)
Alarm Regs
(EEPROM)
Compare
M
RESET
Control
Decode
Logic
Alarm
SCL
SDA
Serial
Interface
Decoder
16K
EEPROM
Array
Watchdog
Timer
Low Voltage
Reset
Registers
(SRAM)
Status
X1242
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| x1243(中文) | Real Time Clock/Calendar/Alarm with EEPROM(帶EEPROM的實時時鐘/日歷/鬧鐘) |
| X12xx-EVM(中文) | Xicor RTC X12xx-EVM User Guide(XICOR RTC X12xx-EVM評估板使用說明) |
| X187 | TEMPERATURSICHERUNG 187GRAD 5ST |
| X25 | 40V Single N-Channel HEXFET Power MOSFET in a D2-Pak package; A IRL1004S with Standard Packaging |
| X2001D-20 | NVRAM (EEPROM Based) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X1242S8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-SMD-RTC WITH EEPROM |
| X1243 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Real Time Clock/Calendar/Alarm with EEPROM |
| X1243S8 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Real Time Clock/Calendar/Alarm with EEPROM |
| X1243S8I | 制造商:Intersil Corporation 功能描述: 制造商:XICOR 功能描述: |
| X1243V8 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Real Time Clock/Calendar/Alarm with EEPROM |
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