Processor Supervisor 3V/3.3V/5V 8-Pin PDIP Rail

The CAT1641 is a complete memory and supervisory solution for microcontroller-based systems. A 64kbit serial EEPROM memory and a system power supervisor with brown-out protection are integrated together in low power CMOS technology. Memory interface is via a 400kHz I²C bus. The CAT1641 provides a precision V sense circuit that drives an open drain output, RESET high whenever V falls below the reset threshold voltage. The power supply monitor and reset circuit protect memory and system controllers during power up/down and against brownout conditions. Five reset threshold voltages support 5V, 3.3V and 3V systems. If power supply voltages are out of tolerance reset signals become active, preventing the system microcontroller, ASIC or peripherals from operating. Reset signals become inactive typically 200 ms after the supply voltage exceeds the reset threshold level. With both active high and low reset options, interface to microcontrollers and other ICs is simple. The CAT1641 memory features a 64-byte page. In addition, hardware data protection is provided by a V sense circuit that prevents writes to memory whenever V falls below the reset threshold or until V reaches the reset threshold during power up. Available packages include an 8-pin DIP, SOIC, TSSOP and 4.9 x 3mm TDFN.

• Precision power supply voltage monitor
  - 5V, 3.3V and 3V systems
  - +5.0V (+/- 5%, +/- 10%)
  - +3.3V (+/- 5%, +/- 10%)
  - +3.0V (+/- 10%)
• Active high reset
• Valid reset guaranteed at V_CC=1V
• 400kHz I²C bus
• 3.0V to 5.5V operation
• Low power CMOS technology
• 64-Byte page write buffer
• 1,000,000 Program/Erase cycles
• 100 year data retention
• 8-pin DIP, SOIC, TSSOP and TDFN packages
• Industrial temperature range