鈩?/div>
Protect 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 microcontrol-
ler 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鈥檚 low V
CC
detection circuitry protects the
user鈥檚 system from low voltage conditions, resetting the
system when V
CC
falls below the minimum V
CC
trip
point. RESET/RESET is asserted until V
CC
returns to
proper operating level and stabilizes. Five industry stan-
dard V
TRIP
thresholds are available, however, Xicor鈥檚
unique circuits allow the thresold to be reprogrammed
to meet custom requirements or to 鏗乶e-tune the thresh-
old for applications requiring higher precision.
X5643 = RESET
X5645 = RESET
V
CC
V
TRIP
餂?/div>
Xicor, Inc. 2000 Patents Pending
9900-3002.5 3/31/00 EP
+
-
Power On and
Low Voltage
Reset
Generation
Characteristics subject to change without notice.
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