CAT1161JI-25

Supervisors Overview

The CAT1161JI-25 is a supervisory circuit manufactured by onsemi, designed for CPU monitoring applications. It integrates an I2C serial CMOS EEPROM with 16K capacity, a precision reset controller, and a watchdog timer. The device operates within a supply voltage range of 2.7 V to 6 V and features a fixed threshold voltage of 2.5 V. It provides a manual reset input and offers configurable output types including active high, active low, and open drain configurations. The reset delay time is specified at 270 ms. The component is housed in an 8-pin SOIC-Wide package and supports surface mount installation. It functions without battery backup switching and lacks power failure detection capabilities.

Supervisors Feature Summary

• Integrates 16K I2C serial CMOS EEPROM for non-volatile data storage alongside supervisory functions
• Includes a built-in watchdog timer to monitor system stability and prevent software lockups
• Provides manual reset capability via dedicated input pin for user-initiated system recovery

Supervisors Applications

• CPU supervisor systems requiring integrated memory and reset control
• Industrial control units needing watchdog timer protection
• Embedded systems utilizing I2C communication for configuration or status logging

Supervisors Procurement Notes

Verify current availability as the part may be discontinued or subject to limited distribution channels. Confirm package type and suffix codes match design requirements. Check RoHS compliance documentation for regulatory adherence. Ensure I2C address compatibility with existing bus architecture. Validate operating temperature range against environmental conditions.

Supervisors Selection Notes

Select this component when a combined supervision and EEPROM solution is required to save board space. Consider the 2.5 V threshold if the monitored rail operates near this level. Verify that the 3 mA operating current fits within system power budgets. Ensure the 8-pin SOIC package fits the PCB footprint constraints. Confirm that the lack of battery backup meets system uptime requirements.

Supervisors Part Context

This part belongs to the CAT1161 family of supervisory circuits from onsemi. Similar variants include the CAT1161WI-25-T3 and CAT1161LI-28-G, which differ primarily in package style and threshold voltage specifications. The family generally combines voltage monitoring with embedded memory and watchdog features for comprehensive system management.

Supervisors Replacement Considerations

Direct substitutes are not explicitly confirmed in public documentation. Evaluate CAT1161WI-25-T3 for surface mount compatibility with adjusted threshold considerations. Review CAT1161LI-28-G for through-hole alternatives if packaging allows. Verify functional equivalence regarding I2C interface and watchdog timing before substitution.