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DATASHEET
X5043, X5045
4K, 512 x 8 Bit CPU Supervisor with 4K SPI EEPROM
FN8126
Rev 3.00
September 23, 2015
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 oscillator to stabilize
before the processor executes code.
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. When the microcontroller
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 VCC detection circuitry protects the user’s
system from low voltage conditions, resetting the system
when VCC falls below the minimum VCC trip point.
RESET/RESET is asserted until VCC returns to proper
operating level and stabilizes. Four industry standard VTRIP
thresholds are available, however, Intersil’s unique circuits
allow the threshold to be reprogrammed to meet custom
requirements or to fine-tune the threshold for applications
requiring higher precision.
The memory portion of the device is a CMOS Serial
EEPROM array with Intersil’s block lock protection. The
array is internally organized as 512 x 8. The device features
a Serial Peripheral Interface (SPI) and software protocol
allowing operation on a simple four-wire bus.
The device utilizes Intersil’s proprietary Direct Writecell,
providing a minimum endurance of 100,000 cycles and a
minimum data retention of 100 years.
Features
• Low VCC Detection and Reset Assertion
- Four standard reset threshold voltages
4.63V, 4.38V, 2.93V, 2.63V
- Re-program low VCC reset threshold voltage using
special programming sequence.
- Reset signal valid to VCC = 1V
• Selectable Time Out Watchdog Timer
• Long Battery Life with Low Power Consumption
- <50µA max standby current, watchdog on
- <10µA max standby current, watchdog off
• 4Kbits of EEPROM–1M Write Cycle Endurance
• Save Critical Data with Block LockMemory
- Protect 1/4, 1/2, all or none of EEPROM array
• Built-in Inadvertent Write Protection
- Write enable latch
- Write protect pin
• SPI Interface - 3.3MHz Clock Rate
• Minimize Programming Time
- 16-byte page write mode
- 5ms write cycle time (typical)
• Available Packages
- 8 Ld MSOP, 8 Ld SOIC, 8 Ld PDIP
- 14 Ld TSSOP
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Communications Equipment
- Routers, Hubs, Switches
- Set Top Boxes
• Industrial Systems
- Process Control
- Intelligent Instrumentation
• Computer Systems
- Desktop Computers
- Network Servers
• Battery Powered Equipment
FN8126 Rev 3.00
September 23, 2015
Page 1 of 21

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X5043, X5045
Typical Application
2.7-5.0V
VCC
X5043
RESET
CS
SCK
SI
SO
WP
VSS
VCC
uC
10K
RESET
SPI
VSS
Block Diagram
VCC
CS/WDI
SI
SO
SCK
WP
VTRIP
+
-
POR and Low
Voltage Reset
Generation
Reset & Watchdog
Timebase
Watchdog
Transition
Detector
Watchdog
Timer
Reset
Command
Decode &
Control
Logic
Protect Logic
Status
Register
EEPROM
Array
4Kbits
RESET (X5043)
RESET (X5045)
X5043, X5045
STANDARD VTRIP LEVEL
4.63V (+/-2.5%)
SUFFIX
-4.5A
4.38V (+/-2.5%)
-4.5
2.93V (+/-2.5%)
-2.7A
2.63V (+/-2.5%)
-2.7
See “Ordering Information” on page 3. for
more details
For Custom Settings, call Intersil.
FN8126 Rev 3.00
September 23, 2015
Page 2 of 21

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X5043, X5045
Ordering Information
PART NUMBER
RESET
(ACTIVE LOW)
PART
MARKING
PART NUMBER
RESET
(ACTIVE HIGH)
PART
MARKING
X5043PZ-4.5A (Note) X5043P Z AL X5045PZ-4.5A (Note) X5045P Z AL
X5043PIZ-4.5A (Note) X5043P Z AM X5045PIZ-4.5A (Note) X5045P Z AM
X5043S8Z-4.5A (Note) X5043 Z AL X5045S8Z-4.5A (Note) X5045 Z AL
X5043S8IZ-4.5A*
(Note)
X5043 Z AM X5045S8IZ-4.5A*
(Note)
X5045 Z AM
X5043M8Z-4.5A
(Note)
DBS
X5045M8Z-4.5A (Note) DCB
(No longer available,
recommended
replacement:
X5045S8Z-4.5A)
X5043M8IZ-4.5A
(Note)
DBM
X5045M8IZ-4.5A
(Note) (No longer
available,
recommended
replacement:
X5045S8IZ-4.5A)
DBX
X5043PZ (Note)
X5043P Z X5045PZ (Note)
X5045P Z
X5043PIZ (Note)
X5043P Z I X5045PIZ (Note)
X5045P Z I
X5043S8Z* (Note)
X5043 Z
X5045S8Z* (Note)
X5045 Z
X5043S8IZ* (Note) X5043 Z I X5045S8IZ* (Note)
X5045 Z I
X5043M8Z (Note)
DBN
X5045M8Z (Note) (No
longer available,
recommended
replacement:
X5045S8Z)
DBY
X5043M8IZ (Note)
DBJ
X5045M8IZ (Note) (No DBT
longer available,
recommended
replacement:
X5045S8IZ-2.7)
X5043V14IZ (Note)
(No longer available,
recommended
replacement:
X5043M8IZ)
X5043V Z I
X5045V14IZ (Note) (No X5045V Z I
longer available or
supported)
VCC
RANGE
4.5-5.5V
VTRIP
RANGE
4.5-4.75
4.25-4.5
TEMP
RANGE
(°C)
0 to 70
-40 to 85
0 to 70
-40 to 85
PACKAGE
8 Ld PDIP (Pb-free)
8 Ld PDIP (Pb-free)
8 Ld SOIC (Pb-free)
8 Ld SOIC (Pb-free)
0 to 70 8 Ld MSOP (Pb-free)
-40 to 85 8 Ld MSOP (Pb-free)
0 to 70
-40 to 85
0 to 70
-40 to 85
0 to 70
8 Ld PDIP (Pb-free)
8 Ld PDIP (Pb-free)
8 Ld SOIC (Pb-free)
8 Ld SOIC (Pb-free)
8 Ld MSOP (Pb-free)
-40 to 85 8 Ld MSOP (Pb-free)
-40 to 85 14 Ld TSSOP
(Pb-free)
FN8126 Rev 3.00
September 23, 2015
Page 3 of 21

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X5043, X5045
Ordering Information (Continued)
PART NUMBER
RESET
(ACTIVE LOW)
PART
MARKING
PART NUMBER
RESET
(ACTIVE HIGH)
PART
MARKING
X5043PZ-2.7A (Note) X5043P Z AN X5045PZ-2.7A (Note) X5045P Z AN
X5043PIZ-2.7A (Note) X5043P Z AP X5045PIZ-2.7A (Note) X5045P Z AP
X5043S8Z-2.7A*
(Note)
X5043 Z AN X5045S8Z-2.7A (Note) X5045 Z AN
X5043S8IZ-2.7A*
(Note)
X5043 Z AP X5045S8IZ-2.7A (Note) X5045 Z AP
X5043M8Z-2.7A
(Note)
DBR
X5045M8Z-2.7A (Note) DCA
(No longer available,
recommended
replacement:
X5045S8Z-2.7A)
X5043M8IZ-2.7A*
(Note)
DBL
X5045M8IZ-2.7A
(Note) (No longer
available,
recommended
replacement:
X5045S8IZ-2.7A)
DBW
X5043PZ-2.7 (Note) X5043P Z F X5045PZ-2.7 (Note) X5045P Z F
X5043PIZ-2.7 (Note) X5043P Z G X5045PIZ-2.7 (Note) X5045P Z G
X5043S8Z-2.7* (Note) X5043 Z F X5045S8Z-2.7* (Note) X5045 Z F
X5043S8IZ-2.7* (Note) X5043 Z G X5045S8IZ-2.7* (Note) X5045 Z G
X5043M8Z-2.7 (Note) DBP
X5045M8Z-2.7 (Note)
(No longer available,
recommended
replacement:
X5045S8Z-2.7)
DBZ
X5043M8IZ-2.7*
(Note)
DBK
X5045M8IZ-2.7 (Note)
(No longer available,
recommended
replacement:
X5045S8IZ-2.7)
DBU
*Add "-T1" suffix for tape and reel.
VCC
RANGE
2.7-5.5V
VTRIP
RANGE
2.85-3.0
2.55-2.7
TEMP
RANGE
(°C)
0 to 70
-40 to 85
0 to 70
PACKAGE
8 Ld PDIP (Pb-free)
8 Ld PDIP (Pb-free)
8 Ld SOIC (Pb-free)
-40 to 85
0 to 70
8 Ld SOIC
(Pb-free)
8 Ld MSOP (Pb-free)
-40 to 85 8 Ld MSOP (Pb-free)
0 to 70
-40 to 85
0 to 70
-40 to 85
0 to 70
8 Ld PDIP (Pb-free)
8 Ld PDIP (Pb-free)
8 Ld SOIC (Pb-free)
8 Ld SOIC (Pb-free)
8 Ld MSOP (Pb-free)
-40 to 85 8 Ld MSOP (Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
FN8126 Rev 3.00
September 23, 2015
Page 4 of 21

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X5043, X5045
Pin Configuration
8 Ld SOIC/PDIP/MSOP
CS/WDI
SO
WP
VSS
18
27
3 X5043, X50456
45
VCC
RESET/RESET
SCK
SI
CS
SO
NC
NC
NC
WP
VSS
14 Ld TSSOP
1 14
2 13
3 12
4 X5043, X504151
5 10
69
78
VCC
RESET/RESET
NC
NC
NC
SCK
SI
Pin Descriptions
Serial Output (SO)
SO is a push/pull serial data output pin. During a read cycle,
data is shifted out on this pin. Data is clocked out by the falling
edge of the serial clock.
Serial Input (SI)
SI is the serial data input pin. All opcodes, byte addresses, and
data to be written to the memory are input on this pin. Data is
latched by the rising edge of the serial clock.
Serial Clock (SCK)
The Serial Clock controls the serial bus timing for data input
and output. Opcodes, addresses, or data present on the SI pin
is latched on the rising edge of the clock input, while data on
the SO pin changes after the falling edge of the clock input.
Chip Select (CS/WDI)
When CS is high, the X5043, X5045 are deselected and the
SO output pin is at high impedance and, unless an internal
write operation is underway, the X5043, X5045 will be in the
standby power mode. CS low enables the X5043, X5045,
placing it in the active power mode. It should be noted that after
power-up, a high to low transition on CS is required prior to the
start of any operation.
Write Protect (WP)
When WP is low, nonvolatile writes to the X5043, X5045 are
disabled, but the part otherwise functions normally. When WP
is held high, all functions, including non volatile writes operate
normally. WP going low while CS is still low will interrupt a write
to the X5043, X5045. If the internal write cycle has already
been initiated, WP going low will have no affect on a write.
Reset (RESET, RESET)
X5043, X5045, RESET/RESET is an active low/HIGH, open
drain output which goes active whenever VCC falls below the
minimum VCC sense level. It will remain active until VCC rises
above the minimum VCC sense level for 200ms.
RESET/RESET also goes active if the Watchdog timer is
enabled and CS remains either high or low longer than the
Watchdog time out period. A falling edge of CS will reset the
watchdog timer.
Pin Names
SYMBOL
CS/WDI
SO
SI
SCK
WP
VSS
VCC
RESET/RESET
DESCRIPTION
Chip Select Input
Serial Output
Serial Input
Serial Clock Input
Write Protect Input
Ground
Supply Voltage
Reset Output
Principles of Operation
Power-on Reset
Application of power to the X5043, X5045 activate a Power-on
Reset Circuit. This circuit pulls the RESET/RESET pin active.
RESET/RESET prevents the system microprocessor from
starting to operate with insufficient voltage or prior to
stabilization of the oscillator. When VCC exceeds the device
VTRIP value for 200ms (nominal) the circuit releases
RESET/RESET, allowing the processor to begin executing
code.
Low Voltage Monitoring
During operation, the X5043, X5045 monitor the VCC level and
asserts RESET/RESET if supply voltage falls below a preset
minimum VTRIP. The RESET/RESET signal prevents the
microprocessor from operating in a power fail or brownout
condition. The RESET/RESET signal remains active until the
voltage drops below 1V. It also remains active until VCC returns
and exceeds VTRIP for 200ms.
Watchdog Timer
The Watchdog Timer circuit monitors the microprocessor
activity by monitoring the WDI input. The microprocessor must
toggle the CS/WDI pin periodically to prevent an active
RESET/RESET signal. The CS/WDI pin must be toggled from
HIGH to LOW prior to the expiration of the watchdog time out
period. The state of two nonvolatile control bits in the Status
Register determines the watchdog timer period. The
microprocessor can change these watchdog bits. With no
microprocessor action, the watchdog timer control bits remain
unchanged, even during total power failure.
FN8126 Rev 3.00
September 23, 2015
Page 5 of 21