CAT1161WI-30-G

Supervisors Overview

The CAT1161WI-30-G is a supervisory circuit manufactured by onsemi, integrating a 16K serial CMOS EEPROM with hardware write protection, a precision reset controller, and a watchdog timer. It operates within a supply voltage range of 2.7 V to 6 V. The undervoltage threshold is specified at 2.85 V, while the overvoltage threshold is 3.15 V. The device features a manual reset input and provides a reset delay time of 270 ms. It supports active high, active low, and open drain outputs. The component is housed in an SOIC-8 surface-mount package and functions across an operating temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Integrates 16K I2C serial EEPROM with hardware write protection alongside power supervision and watchdog functions
• Monitors system voltage for brown-out conditions using precise undervoltage and overvoltage thresholds
• Watchdog timer monitors the SDA line to detect software or hardware glitches without requiring additional PCB traces

Supervisors Applications

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

Supervisors Procurement Notes

Verify component authenticity through authorized distributors as this part may be subject to obsolescence. Confirm that the SOIC-8 package and specific voltage thresholds match the design requirements. Check for RoHS compliance status and ensure the manufacturing date code aligns with project specifications. Validate that the I2C interface compatibility matches the target microcontroller before finalizing procurement decisions.

Supervisors Selection Notes

Select this component when a combined solution for non-volatile storage and system supervision is required. The integration of the watchdog timer on the SDA line simplifies board layout compared to separate supervision ICs. Ensure the application voltage stays within the 2.7 V to 6 V range. Consider the SOIC-8 package constraints for surface-mount assembly processes and verify thermal performance within the specified operating temperature limits.

Supervisors Part Context

This part belongs to the CAT1161 family, which combines supervisory circuits with I2C serial CMOS EEPROM. It serves as a complete memory and supervisory solution for microcontroller systems. The family includes variants with different voltage thresholds and packages, such as the PDIP-8 version. The CAT1161 distinguishes itself from the CAT1162 by including the watchdog timer functionality.

Supervisors Replacement Considerations

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