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參數資料
| 型號： | X4645V8I-4.5A |
| 元件分類： | EEPROM |
| 英文描述： | CPU Supervisor with 64K EEPROM |
| 中文描述： | CPU監控與64K的EEPROM的 |
| 文件頁數： | 1/22頁 |
| 文件大小： | 408K |
| 代理商： | X4645V8I-4.5A |
REV 1.26 4/30/02
Characteristics subject to change without notice.
1 of 22
www.xicor.com
Preliminary Information
64K
X4643/5
8K x 8 Bit
CPU Supervisor with 64K EEPROM
FEATURES
Selectable watchdog timer
Low V
CC
detection and reset assertion
—Four 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
64Kbits of EEPROM
—64-byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
Built-in inadvertent write protection
—Power-up/power-down protection circuitry
400kHz 2-wire interface
2.7V to 5.5V power supply operation
Available packages
—8-lead SOIC
—8-lead TSSOP
CC
= 1V
DESCRIPTION
The X4643/5 combines four popular functions, Power-on
Reset Control, Watchdog Timer, Supply Voltage
Supervision, and Serial EEPROM Memory in one
package. This combination lowers system cost,
reduces board space requirements, and increases reli-
ability.
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 set minimum V
point. RESET/RESET is asserted until V
proper operating level and stabilizes. Four industry
CC
detection circuitry protects the
CC
trip
CC
returns to
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 (X4643/5)
RESET (X4645)
Reset
Status
Register
EEPROM Array
Protect Logic
Watchdog Transition
Detector
WP
V
CC
Threshold
Reset Logic
B
S0
S1
8
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