X4045: CPU Supervisor with 4kbit EEPROM

The X4043/45 combines 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 can execute 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. Five 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 x 8. The device features an 2-wire interface and software protocol allowing operation on an I2C bus.

The device utilizes Intersil's proprietary Direct Write™ cell, providing a minimum endurance of 1,000,000 cycles and a minimum data retention of 100 years.

Key Features
  • Selectable watchdog timer
  • Low VCC detection and reset assertion
    • Five standard reset threshold voltages
    • Adjust low VCC reset threshold voltage using special programming sequence
    • Reset signal valid to VCC = 1V
  • Low power CMOS
    • <20µA max standby current, watchdog on
    • <1µA standby current, watchdog OFF
    • 3mA active current
  • 4kbits of EEPROM
    • 16-byte page write mode
    • Self-timed write cycle
    • 5ms write cycle time (typical)
  • Built-in inadvertent write protection
    • Power-up/power-down protection circuitry
    • Protect 0, 1/4, 1/2, all or 16, 32, 64 or 128 bytes of EEPROM array with Block Lock™ protection
  • 400kHz 2-wire interface
  • 2.7V to 5.5V power supply operation
  • Available packages
    • 8 Ld SOIC
    • 8 Ld MSOP
    • 8 Ld PDIP
  • Pb-free plus anneal available (RoHS compliant)
Typical Diagram
Datasheets
TitleTypeUpdatedSizeOther Languages
X4043, X4045 DatasheetPDF09 Dec 2015414 KB
White Papers
TitleTypeUpdatedSizeOther Languages
Five Easy Steps to Create a Multi-Load Power SolutionPDF30 Jan 2017502 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
X4045M88 Ld MSOP0.0258240
X4045M8-2.78 Ld MSOP0.0258240
X4045M8-2.7A8 Ld MSOP0.0258240
X4045M8-4.5A8 Ld MSOP0.0258240
X4045M8I8 Ld MSOP0.0258240
X4045M8I-2.78 Ld MSOP0.0258240
X4045M8I-2.7A8 Ld MSOP0.0258240
X4045M8I-4.5A8 Ld MSOP0.0258240
X4045M8IZ8 Ld MSOP0.02582260RoHS
X4045M8IZ-2.78 Ld MSOP0.02582260RoHS
X4045M8IZ-2.7A8 Ld MSOP0.02582260RoHS
X4045M8IZ-4.5A8 Ld MSOP0.02582260RoHS
X4045M8Z8 Ld MSOP0.02582260RoHS
X4045M8Z-2.78 Ld MSOP0.02582260RoHS
X4045M8Z-2.7A8 Ld MSOP0.02582260RoHS
X4045M8Z-4.5A8 Ld MSOP0.02582260RoHS
X4045P8 Ld PDIP0.548N/ANA
X4045P-2.78 Ld PDIP0.548N/ANA
X4045P-2.7A8 Ld PDIP0.548N/ANA
X4045P-4.5A8 Ld PDIP0.548N/ANA
X4045PI8 Ld PDIP0.548N/ANA
X4045PI-2.78 Ld PDIP0.548N/ANA
X4045PI-2.7A8 Ld PDIP0.548N/ANA
X4045PI-4.5A8 Ld PDIP0.548N/ANA
X4045PIZ8 Ld PDIP0.548N/ANARoHS
X4045PIZ-2.78 Ld PDIP0.548N/ANARoHS
X4045PIZ-2.7A8 Ld PDIP0.548N/ANARoHS
X4045PIZ-4.5A8 Ld PDIP0.548N/ANARoHS
X4045PZ8 Ld PDIP0.548N/ANARoHS
X4045PZ-2.78 Ld PDIP0.548N/ANARoHS
X4045PZ-2.7A8 Ld PDIP0.548N/ANARoHS
X4045PZ-4.5A8 Ld PDIP0.548N/ANARoHS
X4045S88 Ld SOIC0.0728240
X4045S8-2.78 Ld SOIC0.0728240
X4045S8-2.7A8 Ld SOIC0.0728240
X4045S8-2.7T18 Ld SOIC T+R0.0728240
X4045S8-4.5A8 Ld SOIC0.0728240
X4045S8I8 Ld SOIC0.0728240
X4045S8I-2.78 Ld SOIC0.0728240
X4045S8I-2.7A8 Ld SOIC0.0728240
X4045S8I-4.5A8 Ld SOIC0.0728240
X4045S8IZ8 Ld SOIC0.07281260RoHS
X4045S8IZ-2.78 Ld SOIC0.07281260RoHS
X4045S8IZ-2.7A8 Ld SOIC0.07281260RoHS
X4045S8IZ-4.5A8 Ld SOIC0.07281260RoHS
X4045S8T18 Ld SOIC T+R0.0728240
X4045S8Z8 Ld SOIC0.07281260RoHS
X4045S8Z-2.78 Ld SOIC0.07281260RoHS
X4045S8Z-2.7A8 Ld SOIC0.07281260RoHS
X4045S8Z-2.7T18 Ld SOIC T+R0.07281260RoHS
X4045S8Z-4.5A8 Ld SOIC0.07281260RoHS
X4045S8ZT18 Ld SOIC T+R0.07281260RoHS
X4043, X4045 Datasheet 09 Dec 2015
Five Easy Steps to Create a Multi-Load Power Solution 30 Jan 2017