CAT1161LI-28-G

Supervisors Overview

The CAT1161LI-28-G is a supervisory circuit manufactured by onsemi, designed for microcontroller-based systems. It integrates a 16K serial CMOS EEPROM with hardware write protection, a precision reset controller, and a watchdog timer within a single low-power CMOS device. The component operates within a supply voltage range of 2.7 V to 6 V. It features an under-voltage threshold of 2.85 V and an over-voltage threshold of 3 V. The reset delay time is specified at 270 ms. The device supports manual reset functionality and utilizes an I2C bus interface for memory access. It is available in a PDIP-8 through-hole package and functions across an operating temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Integrates 16K serial EEPROM with hardware write protection alongside power supervision and watchdog timer
• Monitors system integrity via the SDA line for the watchdog function without requiring additional traces
• Provides precise brown-out protection and configurable reset output states

Supervisors Applications

• Microcontroller-based system power management
• Embedded systems requiring non-volatile data storage and supervision
• Industrial control units needing watchdog timer protection

Supervisors Procurement Notes

Verify component authenticity as this part is listed as obsolete or discontinued by the manufacturer. Confirm availability through authorized distributors or secondary market sources. Ensure the PDIP-8 package type matches the target PCB footprint. Check RoHS compliance documentation if required for specific regulatory standards. Validate that the 2.85 V threshold aligns with the system's power rail requirements before integration.

Supervisors Selection Notes

Select this component when a combined solution for memory storage and system supervision is required. The integrated watchdog timer eliminates the need for external monitoring circuits. Ensure the application voltage falls within the 2.7 V to 6 V operational range. Consider the PDIP-8 package constraints for board layout. Verify that the I2C interface compatibility exists with the host processor. This part is suitable for designs prioritizing component count reduction and board space efficiency.

Supervisors Part Context

The CAT1161 series belongs to onsemi's family of supervisory circuits that combine memory and power management functions. Unlike the CAT1162, which lacks a watchdog timer, the CAT1161 includes this feature for enhanced system reliability. The 'LI' suffix typically denotes industrial temperature range specifications. The '28' indicates the specific under-voltage threshold version. These devices are designed to simplify design efforts by consolidating multiple functions into a single IC.

Supervisors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the component is marked as obsolete, alternative sourcing should focus on compatible parts from the same family or functional equivalents with matching thresholds and packages.