Processor Supervisor 4.38V 4.5V to 5.5V 8-Pin SOIC

These devices combine four popular functions, Power-onReset Control, Watchdog Timer, Supply Voltage Supervision,and Block Lock Protect Serial EEPROM Memory in onepackage. This combination lowers system cost, reducesboard space requirements, and increases reliability. Applying power to the device activates the power-on resetcircuit which holds RESET/RESET active for a period oftime. This allows the power supply and oscillator to stabilizebefore the processor executes code. The Watchdog Timer provides an independent protectionmechanism for microcontrollers. When the microcontrollerfails to restart a timer within a selectable time out interval,the device activates the RESET/RESET signal. The userselects 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’ssystem from low voltage conditions, resetting the systemwhen VCC falls below the minimum VCC trip point.RESET/RESET is asserted until VCC returns to properoperating level and stabilizes. Four industry standard VTRIPthresholds are available, however, Intersil’s unique circuitsallow the threshold to be reprogrammed to meet customrequirements or to fine-tune the threshold for applicationsrequiring higher precision. The memory portion of the device is a CMOS SerialEEPROM array with Intersil’s block lock protection. Thearray is internally organized as 512 x 8. The device featuresa Serial Peripheral Interface (SPI) and software protocolallowing operation on a simple four-wire bus. The device utilizes Intersil’s proprietary Direct Write cell,providing a minimum endurance of 100,000 cycles and aminimum data retention of 100 years.

• 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 Lock™ Memory
  • 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)