CAT1021WI42

Supervisors Overview

The CAT1021WI42 is a voltage supervisory circuit manufactured by onsemi, designed for microcontroller-based systems. It integrates a 2k-bit serial EEPROM with power supply monitoring capabilities. The device operates within a supply voltage range of 2.7 V to 5.5 V and features a threshold voltage of 4.2 V. It includes a watchdog timer and manual reset functionality. The component is housed in an SOIC-8 surface-mount package and supports operation across a temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Integrates a 2k-bit CMOS serial EEPROM with inadvertent write protection via the WP pin.
• Provides precise power supply voltage monitoring with guaranteed valid reset signals down to 1 V.
• Includes a watchdog timer and manual reset capability for enhanced system reliability.

Supervisors Applications

• Microcontroller-based system supervision
• CPU reset generation
• Power management circuits

Supervisors Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for End-of-Life (EOL) notifications, as this specific part number may be discontinued. Ensure the SOIC-8 package variant matches design requirements before procurement.

Supervisors Selection Notes

Select this component when a combined EEPROM and supervisor solution is required for 5 V or 3.3 V systems. The fixed 4.2 V threshold suits applications needing specific voltage monitoring levels. Consider the SOIC-8 package for surface-mount assembly constraints and verify that the integrated watchdog and manual reset features align with system safety protocols.

Supervisors Part Context

This part belongs to the CAT1021 series, which combines memory and supervisory functions. It is distinct from variants like the CAT1026, which lacks the watchdog and manual reset features. The WI suffix indicates the SOIC-8 surface-mount package, while the 42 suffix denotes the 4.2 V threshold voltage option.

Supervisors Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with alternative parts such as other CAT1021 variants with different thresholds or packages only after confirming functional equivalence.