X40626
®
64K, 8K x 8 Bit
Data Sheet
March 28, 2005
FN8119.0
PRELIMINARY
• 2.7V to 5.5V power supply operation
• Available Packages
—14-lead SOIC
Dual Voltage CPU Supervisor with 64K
Serial EEPROM
—14-lead TSSOP
FEATURES
• Dual voltage monitoring
DESCRIPTION
—V
operates independent of V
2Mon
CC
The X40626 combines four popular functions, Power-on
Reset Control, Watchdog Timer, Dual Supply Voltage
Supervision, and Serial EEPROM Memory in one pack-
age. This combination lowers system cost, reduces
board space requirements, and increases reliability.
• Watchdog timer with selectable timeout intervals
• Low V detection and reset assertion
CC
—Four standard reset threshold voltages
—User programmable V
threshold
TRIP
—Reset signal valid to V =1V
CC
• Low power CMOS
Applying power to the device activates the power-on
reset circuit which holds RESET active for a period of
time. This allows the power supply and oscillator to stabi-
lize before the processor can execute code.
—20µA max standby current, watchdog on
—1µA standby current, watchdog OFF
• 64Kbits of EEPROM
—64 byte page size
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2, all or 64, 128, 256 or 512
bytes of EEPROM array with programmable
Block Lock protection
• 400kHz 2-wire interface
The Watchdog Timer provides an independent protec-
tion mechanism for microcontrollers. When the micro-
controller fails to restart a timer within a selectable time-
out interval, the device activates the RESET signal. The
user selects the interval from three preset values. Once
selected, the interval does not change, even after cycling
the power.
™
—Slave addressing supports up to 4 devices on
the same bus
BLOCK DIAGRAM
V2FAIL
+
V2MON
V
-
TRIP2
V2 Monitor
Logic
Watchdog Transition
Detector
Watchdog
Timer Reset
WP
Protect Logic
RESET
Data
Register
SDA
Status
Register
Command
Reset &
Watchdog
Timebase
SCL
Decode &
Control
Logic
S0
S1
64KB
EEPROM
Array
V
Threshold
CC
Reset logic
Power-on and
Low Voltage
Reset
V
+
-
CC
Generation
V
TRIP
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
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