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參數資料
| 型號： | X4045S8-4.5A |
| 元件分類： | CPU監測 |
| 英文描述： | RTC Module With CPU Supervisor |
| 中文描述： | 時鐘模塊CPU監控 |
| 文件頁數： | 1/25頁 |
| 文件大小： | 144K |
| 代理商： | X4045S8-4.5A |
REV 1.1.17 9/14/01
Characteristics subject to change without notice.
1 of 25
www.xicor.com
CPU Supervisor with 4Kbit EEPROM
512 x 8 Bit
X4043/45
4K
BLOCK DIAGRAM
Watchdog
Timer Reset
Data
Register
Command
Decode &
Control
Logic
SDA
SCL
V
CC
Reset &
Watchdog
Timebase
Power on and
Low Voltage
Generation
V
TRIP
+
-
RESET (X4043)
RESET (X4045)
Reset
Status
Register
EEPROM Array
Protect Logic
Watchdog Transition
Detector
WP
V
CC
Threshold
Reset logic
B
2
FEATURES
Selectable watchdog timer
Low V
CC
detection and reset assertion
—Five standard reset threshold voltages
—Adjust low V
CC
reset threshold voltage using
special programming sequence
—Reset signal valid to V
Low power CMOS
—<20μA max standby current, watchdog on
—<1μA standby current, watchdog OFF
—3mA active current
4Kbits of EEPROM
—16-byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2, all or 16, 32, 64 or 128 bytes
of EEPROM array with Block Lock
400kHz 2-wire interface
2.7V to 5.5V power supply operation
Available packages
—8-lead SOIC
—8-lead MSOP
—8-lead PDIP
CC
= 1V
protection
DESCRIPTION
The X4043/45 combines four popular functions,
Power-on Reset Control, Watchdog Timer, Supply
Voltage Supervision, and Block Lock Protect Serial
EEPROM Memory in one package. This combination
lowers system cost, reduces board space require-
ments, and increases reliability.
Applying power to the device activates the power on
reset circuit which holds RESET/RESET active for a
period of time. This allows the power supply and oscilla-
tor to stabilize before the processor can execute code.
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. When the microcon-
troller fails to restart a timer within a selectable time
out interval, the device activates the RESET/RESET
signal. The user selects the interval from three preset
values. Once selected, the interval does not change,
even after cycling the power.
The device’s low V
user’s system from low voltage conditions, resetting the
system when V
CC
falls below the minimum V
point. RESET/RESET is asserted until V
proper operating level and stabilizes. Five industry stan-
dard V
TRIP
thresholds are available, however, Xicor’s
unique circuits allow the threshold to be reprogrammed
to meet custom requirements or to fine-tune the thresh-
old for applications requiring higher precision.
CC
detection circuitry protects the
CC
trip
CC
returns to
相關PDF資料 |
PDF描述 |
|---|---|
| X4045S8I | RTC Module With CPU Supervisor |
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| X40431 | 10NS, PLCC, COM TEMP (SEE C-10)(EPLD) |
| X4043M8-1.8 | 25NS, SOIC, COM TEMP(EPLD) |
| X4043P8 | 10NS, PDIP, COM TEMP(EPLD) |
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