The CAT1026WI-45 is a complete memory and supervisory solution for microcontroller-based systems. A EEPROM Serial 2-Kb CPU Supervisor and a system power supervisor with brown-out protection are integrated together in low power CMOS technology. Memory interface is via a 400 kHz I²C bus.The CAT1026WI-45 provides a precision VCC sense circuit with five reset threshold voltage options that support 5.0 V, 3.3 V and 3.0 V systems. The power supply monitor and reset circuit protects memory and systems controllers during power up/down and against brownout conditions. If power supply voltages are out of tolerance reset signals become active preventing the system microcontroller, ASIC, or peripherals from operating.The CAT1026WI-45 features two open drain reset outputs: one (RESET) drives high and the other (RESET) drives low whenever VCC falls below the threshold. Reset outputs become inactive typically 200 ms after the supply voltage exceeds the reset threshold value. With both active high and low reset signals, interface to microcontrollers and other ICs is simple. In addition, the RESET pin can be used as an input for push-button manual reset capability.The CAT1026WI-45 provides an auxiliary voltage sensor input, VSENSE, which is used to monitor a second system supply. The auxiliary high impedance comparator drives the open drain output, VLOW, whenever the sense voltage is below 1.25 V threshold.The on-chip 2k-bit EEPROM memory features a 16-byte page. In addition, hardware data protection is provided by a VCC sense circuit that prevents writes to memory whenever VCC falls below the reset threshold or until VCC reaches the reset threshold during power up.Available packages include an 8-pin DIP, 8-pin SOIC, 8-pin TSSOP, 8-pin TDFN and 8-pin MSOP. The TDFN package thickness is 0.8 mm maximum. TDFN footprint is 3x3 mm.
Feature
- Precision VCC power supply voltage supervisor5.0 V, 3.3 V and 3.0 V systemsFive threshold voltage options
- Additional voltage monitoring — Externally adjustable down to 1.25 V
- Active high or low reset — Valid reset guaranteed to VCC = 1 V
- 400 kHz I²C bus
- 3.0 V to 5.5 V operation
- Low power CMOS technology
- 16-Byte page write buffer
- Built-in inadvertent write protection
- 1,000,000 Program/Erase cycles
- Manual reset capability
- 100 year data retention
- 8-pin DIP, SOIC, TSSOP, MSOP or TDFN (3 x 3 mm foot-print) packages — TDFN max height is 0.8mm
- Industrial and extended temperature ranges
Applications
- Industrial control
- Medical systems
- Printers
- Mass storage
