
1
FN8120.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
X4163, X4165
16K, 2K x 8 Bit
CPU Supervisor with 16K 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
CC
= 1V
Low power CMOS
—<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
—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-lead SOIC
—8-lead TSSOP
DESCRIPTION
The X4163/5 combines four popular functions, Power-
on Reset Control, Watchdog Timer, 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/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 protec-
tion mechanism for microcontrollers. When the micro-
controller fails to restart a timer within a selectable
time
out
interval,
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.
device
activates
the
The device’s low V
CC
detection circuitry protects the
user’s system from low voltage conditions, resetting the
system when V
CC
falls below the set minimum V
CC
trip
point. RESET/RESET is asserted until V
CC
returns to
proper operating level and stabilizes. Four industry
standard V
TRIP
thresholds are available, however, Inter-
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
Timer Reset
Data
Register
Command
Decode &
Control
Logic
SDA
SCL
V
CC
Reset &
Watchdog
Timebase
Power on and
Low Voltage
Generation
V
TRIP
+
-
RESET (X4163)
RESET (X4165)
Reset
Status
Register
EEPROM Array
Protect Logic
Watchdog Transition
Detector
WP
V
CC
Threshold
Reset logic
B
2
S0
S1
Data Sheet
April 13, 2005