CAT1161LI-28

Supervisors Overview

The CAT1161LI-28-G is a supervisory circuit manufactured by onsemi, designed for microcontroller-based systems. It integrates a 16K I2C serial CMOS EEPROM with hardware write protection, a precision reset controller, and a watchdog timer. The device operates within a supply voltage range of 2.7 V to 6 V, featuring an undervoltage threshold of 2.85 V and an overvoltage threshold of 3 V. It provides a manual reset input and offers active high, active low, or open drain output options. The reset delay time is 270 ms, and the operating current is 3 mA. Packaged in a PDIP-8 through-hole format, it supports an industrial temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Integrates 16K I2C serial EEPROM with hardware memory write protection alongside system power supervision.
• Includes a watchdog timer that monitors the SDA line to restore the system state upon software or hardware glitches.

Supervisors Applications

• Microcontroller-based system monitoring
• CPU supervision with integrated data storage
• Industrial control systems requiring brown-out protection

Supervisors Procurement Notes

Verify the specific suffix 'G' for RoHS compliance and lead-free status when ordering. Confirm the package type matches the design requirements, as this part number corresponds to the PDIP-8 through-hole variant. Check manufacturer documentation for any product change notices (PCN) regarding manufacturing location or material updates. Ensure the selected threshold voltage aligns with the target system's power rail specifications.

Supervisors Selection Notes

Select this component when a combined solution for non-volatile data storage and system supervision is required. The CAT1161 series is suitable for applications needing hardware write protection and watchdog functionality without additional external components. Compare against the CAT1162 if the watchdog timer feature is not necessary, as the CAT1162 offers a lower cost alternative with identical memory and reset capabilities.

Supervisors Part Context

The CAT1161 belongs to the CAT1161/2 family of supervisory circuits from onsemi. This family combines I2C serial CMOS EEPROM with precision reset controllers and watchdog timers. The CAT1161 specifically includes the watchdog timer, whereas the CAT1162 omits this feature. These devices are designed to provide a complete memory and supervisory solution for embedded systems.

Supervisors Replacement Considerations

Public confirmed substitute part numbers: CAT1161WI-28-G (SOIC-8 package), CAT1021LI-28-G (similar function but different memory size).