CAT1161WI28

Supervisors Overview

The CAT1161WI28 is a supervisory circuit integrating a 16K I2C serial CMOS EEPROM, a precision reset controller, and a watchdog timer. It operates within a supply voltage range of 2.7 V to 6 V with a typical undervoltage threshold of 2.85 V and an overvoltage threshold of 3 V. The device features a manual reset input, an open-drain output, and a 270 ms reset delay time. It supports active high, active low, or open drain configurations and consumes 3 mA of operating current. The component is housed in an SOIC-Wide-8 package and functions across a temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Integrates 16K I2C serial EEPROM with hardware write protection alongside system power supervision
• Includes a watchdog timer that monitors the SDA line to detect software or hardware glitches
• Provides precise brown-out protection with configurable reset output polarities

Supervisors Applications

• Microcontroller-based systems requiring integrated memory and supervision
• Embedded applications needing hardware memory write protection
• Systems requiring automatic recovery from software hangs via watchdog monitoring

Supervisors Procurement Notes

Verify availability status as this component may be discontinued or subject to limited supply. Confirm exact suffix specifications against official datasheets to ensure compatibility with required voltage thresholds and package types. Check for alternative sourcing channels if direct manufacturer distribution is unavailable. Validate RoHS compliance details prior to integration into regulated products.

Supervisors Selection Notes

Select this component when a combined solution for non-volatile data storage and power management is required. The integrated watchdog eliminates the need for external timing components by monitoring the I2C bus activity. Ensure the application environment stays within the specified operating temperature range and voltage limits to maintain reliable reset performance and memory integrity.

Supervisors Part Context

This part belongs to the CAT1161/2 family of supervisory circuits designed for microcontroller systems. It combines memory, reset control, and watchdog functionality in a single low-power CMOS package. The CAT1161 variant specifically includes the watchdog timer, distinguishing it from the lower-cost CAT1162 which lacks this feature. The I2C interface allows standard communication protocols for data access.

Supervisors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.