CAT1161LI-25-G

Supervisors Overview

The CAT1161LI-25-G is a voltage supervisory circuit manufactured by onsemi, designed for CPU monitoring applications. It integrates a precision reset controller with a watchdog timer and an I2C serial CMOS EEPROM. The device operates within a supply voltage range of 2.7 V to 6 V. Key electrical parameters include a minimum operating voltage of 2.7 V, a maximum operating voltage of 6 V, and a typical quiescent current of 3 mA. The undervoltage threshold is specified at 2.55 V, while the overvoltage threshold is 2.7 V. The reset delay time is 270 ms. It features manual reset capability and supports active high, active low, and open drain output types. The component is housed in an 8-pin PDIP package and is rated for operation between -40°C and +85°C.

Supervisors Feature Summary

• Integrates a 16K I2C serial CMOS EEPROM alongside voltage supervision functions
• Includes a built-in watchdog timer for system reliability monitoring
• Provides manual reset input capability for user-initiated control
• Supports multiple output configurations including active high, active low, and open drain

Supervisors Applications

• CPU power supply monitoring in embedded systems
• System reset generation for microcontroller-based designs
• Data storage integration via integrated EEPROM for configuration or logging

Supervisors Procurement Notes

Verify component authenticity through authorized distributors as this part may be subject to obsolescence notices. Confirm that the specific suffix matches required pinout and electrical specifications. Check for recent Product Change Notifications (PCN) regarding manufacturing site or material changes. Ensure compatibility with existing PCB footprint and thermal requirements before finalizing procurement plans.

Supervisors Selection Notes

Select this component when simultaneous voltage supervision and non-volatile data storage are required in a single package. Consider the 2.55 V undervoltage threshold for appropriate system startup timing. Evaluate the 3 mA quiescent current against total system power budgets. Verify that the PDIP-8 package fits the mechanical constraints of the target enclosure.

Supervisors Part Context

This part belongs to the CAT1161 family of supervisory circuits from onsemi. These devices combine power management monitoring with memory capabilities. The LI suffix typically indicates a lead-free and halogen-free compliant version within the PDIP package line. This family targets industrial and consumer electronics requiring robust system reset and configuration storage.

Supervisors Replacement Considerations

Check for direct cross-reference parts with identical 2.55 V thresholds and 16K EEPROM capacity. Verify pin-to-pin compatibility if substituting with other manufacturers' offerings. Ensure the replacement also includes a watchdog timer if that feature is critical to the design.