CAT1021WI25

Supervisors Overview

The CAT1021WI-25 is a supervisory circuit manufactured by onsemi, designed for CPU systems. It integrates a 2k-bit serial EEPROM with I²C interface, a manual reset function, and a watchdog timer. The device monitors supply voltage with a threshold of 2.5 V to 2.55 V and an overvoltage threshold of 2.7 V. It operates within a supply voltage range of 2.7 V to 5.5 V. The component features active high, active low, or open drain outputs and includes a 200 ms reset delay. It is housed in an SOIC-8 package and supports industrial temperature ranges from -40°C to +85°C.

Supervisors Feature Summary

• Integrates 2k-bit serial EEPROM memory with I²C communication capability
• Provides system power supervision with manual reset and watchdog timer functions
• Offers flexible output configurations including active high, active low, and open drain options

Supervisors Applications

• Microcontroller-based system power management
• CPU monitoring and protection circuits
• Data retention systems requiring non-volatile memory integration

Supervisors Procurement Notes

Verify the exact suffix (e.g., -GT3) as the base model number may refer to multiple packaging variants. Confirm RoHS compliance status and lead times through official distributors. Check for end-of-life notices, as this series has been marked obsolete by the manufacturer. Ensure the specific voltage threshold matches the design requirements before ordering.

Supervisors Selection Notes

Select this component when a combined supervisory circuit and non-volatile memory solution is required for space-constrained designs. The SOIC-8 package offers surface-mount convenience. Verify that the 2.5 V threshold aligns with the target system's operating voltage. Consider the I²C interface compatibility with the host microcontroller. Evaluate the need for the integrated watchdog timer versus external solutions.

Supervisors Part Context

This part belongs to the CAT1021 family of supervisory circuits from onsemi. The family combines voltage monitoring with 2k-bit EEPROM storage. Variants differ primarily in threshold voltages and package types. The WI suffix typically denotes the SOIC-8 surface-mount package. The series is designed for cost-effective integration of memory and supervision in embedded applications.

Supervisors Replacement Considerations

Direct replacements include other CAT1021 variants with matching thresholds and packages, such as CAT1021WI-30-GT3 for different voltage levels. Cross-reference with CAT1022 or CAT1023 models if additional features like write protection are needed. Verify pinout compatibility and electrical specifications before substitution.