CAT1022LI-25-G

Supervisors Overview

The CAT1022LI-25-G is a voltage supervisory circuit manufactured by onsemi, designed for CPU system monitoring. It integrates a 2Kb CMOS EEPROM with I2C serial interface capabilities. The device operates within a supply voltage range of 2.7 V to 5.5 V and features a manual reset input. It includes a watchdog timer that monitors the SDA line for proper communication activity. The component utilizes an open collector/drain output type and provides a reset delay time of 200 ms. It is housed in an 8-pin PDIP package and supports through-hole mounting. The operating temperature range extends from -40°C to +85°C, with a typical quiescent current of 3 mA.

Supervisors Feature Summary

• Integrates 2Kb CMOS EEPROM with I2C serial interface for data storage alongside supervision functions
• Includes watchdog timer functionality that monitors SDA line activity to detect system lockups
• Features manual reset input capability allowing user-initiated system restarts
• Provides open collector/drain output for flexible interfacing with various logic families

Supervisors Applications

• CPU system power supply monitoring and reset generation
• Embedded systems requiring non-volatile data storage with supervision
• Industrial control units needing watchdog timer protection
• Consumer electronics with low-power voltage supervision requirements

Supervisors Procurement Notes

Verify the specific suffix 'LI' corresponds to the PDIP-8 through-hole package variant when sourcing replacements. Confirm RoHS compliance status as indicated in official documentation. Check manufacturer lifecycle status as this part may be subject to discontinuation notices. Ensure compatibility with existing PCB footprints for 8-pin DIP configurations during procurement planning.

Supervisors Selection Notes

Select this component when both voltage supervision and small data storage are required in a single package. Consider the PDIP-8 package constraint if space allows for through-hole assembly. Evaluate the 200 ms reset delay against system timing requirements. Verify that the I2C interface speed matches the microcontroller capabilities. Assess the watchdog timer's SDA monitoring feature against the application's communication patterns.

Supervisors Part Context

This part belongs to the CAT1022 series of supervisory circuits from onsemi (formerly Catalyst Semiconductor). The series combines power management IC functions with memory components. The CAT1022LI-25-G specifically denotes the low-voltage threshold variant with EEPROM integration. It serves as a complete solution for systems needing reliable reset generation and persistent data retention without external components.

Supervisors Replacement Considerations

CAT1022YI-25-GT3 offers similar functionality but in a TSSOP-8 surface-mount package. CAT1022ZI-25-G provides the same electrical characteristics in an MSOP-8 package. Cross-reference pinouts and package dimensions carefully when substituting. Verify that the replacement maintains the 2Kb EEPROM capacity and I2C interface compatibility.