DATASHEET
X4163, X4165
16K, 2K x 8 Bit CPU Supervisor with 16K EEPROM
FN8120
Rev 2.00
November 26, 2007
FEATURES
DESCRIPTION
• Selectable watchdog timer
The X4163, X4165 combines four popular functions,
Power-on Reset Control, Watchdog Timer, Supply Volt-
age Supervision, and Serial EEPROM Memory in one
package. This combination lowers system cost,
reduces board space requirements, and increases reli-
ability.
• Low V detection and reset assertion
CC
—Four standard reset threshold voltages
—Adjust low V reset threshold voltage using
CC
special programming sequence
—Reset signal valid to V = 1V
CC
• Low power CMOS
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.
—<20µA max standby current, watchdog on
—<1µA standby current, watchdog OFF
—3mA active current
• 16Kbits of EEPROM
—64-byte page write mode
—Self-timed write cycle
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/RESET signal. The user selects the interval
from three preset values. Once selected, the interval
does not change, even after cycling the power.
—5ms write cycle time (typical)
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Block Lock (1, 2, 4, 8 pages, all, none)
• 400kHz 2-wire interface
• 2.7V to 5.5V power supply operation
• Available Packages
—8 Ld SOIC
The device’s low V
detection circuitry protects the
CC
user’s system from low voltage conditions, resetting the
system when V falls below the set minimum V trip
CC
CC
—8 Ld TSSOP
• Pb-free plus anneal available (RoHS compliant)
point. RESET/RESET is asserted until V
returns to
CC
proper operating level and stabilizes. Four industry
standard V thresholds are available, however, Inter-
TRIP
sil’s unique circuits allow the threshold to be repro-
grammed to meet custom requirements or to fine-tune
the threshold for applications requiring higher precision.
BLOCK DIAGRAM
Watchdog Transition
Detector
Watchdog
Timer Reset
WP
Protect Logic
RESET (X4163)
RESET (X4165)
Data
Register
SDA
Status
Register
EEPROM Array
Command
Reset &
Watchdog
Timebase
SCL
Decode &
Control
Logic
S0
S1
VCC Threshold
Reset logic
Power on and
Low Voltage
Reset
VCC
+
-
VTRIP
Generation
FN8120 Rev 2.00
November 26, 2007
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