X40626 Datasheet, PDF (1/22 Pages) Xicor Inc. – Dual Voltage CPU Supervisor with 64K Serial EEPROM

®
PRELIMINARY
Data Sheet
March 28, 2005
X40626
64K, 8K x 8 Bit
FN8119.0
Dual Voltage CPU Supervisor with 64K
Serial EEPROM
FEATURES
• Dual voltage monitoring
—V_2Mon operates independent of V_CC
• Watchdog timer with selectable timeout intervals
• Low V_CC detection and reset assertion
—Four standard reset threshold voltages
—User programmable V_TRIP threshold
—Reset signal valid to V_CC=1V
• Low power CMOS
—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
—Slave addressing supports up to 4 devices on
the same bus
• 2.7V to 5.5V power supply operation
• Available Packages
—14-lead SOIC
—14-lead TSSOP
DESCRIPTION
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.
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.
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.
BLOCK DIAGRAM
V2MON
WP
SDA
SCL
S0
S1
V_CC
V2 Monitor
Logic
+
V_TRIP2
-
Watchdog Transition
Detector
Data
Register
Command
Decode &
Control
Logic
V_CC Threshold
Reset logic
Protect Logic
Status
Register
64KB
EEPROM
Array
Watchdog
Timer Reset
Reset &
Watchdog
Timebase
+
V_TRIP
-
Power-on and
Low Voltage
Reset
Generation
V2FAIL
RESET
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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