CAT1021WI-25-G

Supervisors Overview

The CAT1021WI-25-G is a power supply management circuit manufactured by onsemi, formerly Catalyst Semiconductor. It integrates a 2k-bit serial EEPROM with an I²C interface and a voltage supervisory circuit in an 8-pin SOIC package. The device operates within a supply voltage range of 2.7 V to 5.5 V. Key electrical parameters include a threshold voltage of 2.5 V, an overvoltage threshold of 2.7 V, and an undervoltage threshold of 2.55 V. It features manual reset capability, a watchdog timer, and supports the standard 400 kHz I²C bus speed.

Supervisors Feature Summary

• Integrates a 2k-bit CMOS EEPROM with I²C serial interface for non-volatile data storage
• Provides precision power supply monitoring with brown-out protection and manual reset input
• Includes built-in inadvertent write protection via the WP pin to prevent accidental data corruption

Supervisors Applications

• Microcontroller-based system memory and supervision
• Industrial control systems requiring data retention during power fluctuations
• Automotive electronic modules needing robust power monitoring

Supervisors Procurement Notes

Verify current availability status as this component may be subject to discontinuation or limited stock. Confirm that the manufacturer designation aligns with onsemi specifications rather than legacy Catalyst documentation. Ensure the SOIC-8 package and RoHS compliance match your assembly requirements before finalizing procurement orders.

Supervisors Selection Notes

Select this component when a combined solution for system supervision and low-speed serial data storage is required. It is suitable for designs operating between 2.7 V and 5.5 V that need precise voltage monitoring with a 2.5 V threshold. Consider the manual reset feature and watchdog timer if system reliability against software hangs or power anomalies is critical.

Supervisors Part Context

This part belongs to the CAT1021 family of supervisory circuits which combine EEPROM memory with power management functions. Originally developed by Catalyst Semiconductor, the product line was integrated into onsemi's portfolio. The WI suffix indicates the SOIC-8 package variant, while the 25 denotes the specific voltage threshold configuration.

Supervisors Replacement Considerations

CAT1021ZI-25-G (MSOP-8 package variant)

Supervisors FAQ

Does the CAT1021WI-25-G include a watchdog timer?

Yes, the device includes a built-in watchdog timer to monitor system software execution.

What is the maximum I²C clock frequency supported?

The device supports the standard I²C bus speed of up to 400 kHz.