X5043 XICOR [Xicor Inc.], X5043 Datasheet
X5043
Manufacturer Part Number
X5043
Description
CPU Supervisor with 4K SPI EEPROM
Manufacturer
XICOR [Xicor Inc.]
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4K
FEATURES
• Selectable time out watchdog timer
• Low V
• Long battery life with low power consumption
• 2.7V to 5.5V and 4.5V to 5.5V power supply
• 4Kbits of EEPROM–1M write cycle endurance
• Save critical data with Block Lock
• Built-in inadvertent write protection
• 3.3MHz clock rate
• Minimize programming time
• SPI modes (0,0 & 1,1)
• Available packages
BLOCK DIAGRAM
REV 1.1.2 5/29/01
—Five standard reset threshold voltages
—Re-program low V
—Reset signal valid to V
—<50µA max standby current, watchdog on
—<10µA max standby current, watchdog off
—<2mA max active current during read
versions
—Protect 1/4, 1/2, all or none of EEPROM array
—Write enable latch
—Write protect pin
—16-byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
—8-lead MSOP, 8-lead SOIC, 8-pin PDIP
—14-lead TSSOP
CS/WDI
using special programming sequence.
SCK
V
WP
SO
CC
SI
CC
detection and reset assertion
V
CC
Reset Logic
CC
Command
Decode &
Register
Control
Logic
Threshold
Data
reset threshold voltage
CC
CPU Supervisor with 4K SPI EEPROM
= 1V
Watchdog Transition
™
memory
V
Detector
TRIP
X5043/X5045
www.xicor.com
Protect Logic
Register
1Kbits
1Kbits
2Kbits
Status
+
-
DESCRIPTION
These devices combine four popular functions, Power-
on Reset Control, Watchdog Timer, Supply Voltage
Supervision, and Block Lock Protect Serial EEPROM
Memory in one package. 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 oscil-
lator to stabilize before the processor executes 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/
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’s low V
user’s system from low voltage conditions, resetting
the system when V
trip point. RESET/RESET is asserted until V
to proper operating level and stabilizes. Five industry
standard V
Xicor’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.
Power on and
Low Voltage
Timer Reset
Generation
Watchdog
Watchdog
Timebase
TRIP
Reset &
Reset
thresholds are available, however,
Characteristics subject to change without notice.
CC
CC
detection circuitry protects the
falls below the minimum V
512 x 8 Bit
RESET/RESET
X5043 = RESET
X5045 = RESET
CC
returns
1 of 20
CC