CAT1161W28

Supervisors Overview

The CAT1161W28 is a voltage supervisory circuit manufactured by onsemi, designed for CPU monitoring applications. It integrates an I2C serial CMOS EEPROM with 16K capacity, a precision reset controller, and a watchdog timer. The device operates within a supply voltage range of 2.7 V to 6 V, featuring a threshold voltage of 2.8 V. It provides active high, active low, and open drain output options with a manual reset capability. The reset delay time is specified at 270 ms. The component supports through-hole or surface-mount installation styles, typically housed in SOIC-8 packages, and functions reliably across an operating temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Integrates I2C serial CMOS EEPROM with 16K storage capacity alongside supervisory functions
• Includes precision reset controller and watchdog timer for system stability
• Supports multiple output configurations including active high, active low, and open drain

Supervisors Applications

• CPU power supply monitoring
• Embedded system reset control
• Data retention via integrated EEPROM

Supervisors Procurement Notes

Verify the exact suffix and package variant when sourcing, as the base part number may correspond to different physical packages like SOIC-8 or PDIP-8 depending on the specific ordering code. Confirm availability status as distribution channels may list this item as discontinued or limited stock. Ensure the selected variant matches the required threshold voltage and output type specifications for the target design.

Supervisors Selection Notes

Select this component when a combined solution for power supervision and non-volatile data storage is required. The integration of the I2C EEPROM reduces board space compared to discrete solutions. Consider the 2.8 V threshold and 270 ms delay against the system's power-up timing requirements. Verify that the available output types meet the logic interface needs of the monitored microcontroller.

Supervisors Part Context

This part belongs to the CAT1161 family of supervisory circuits from onsemi (formerly Catalyst Semiconductor). The family is characterized by the combination of voltage monitoring with embedded memory. Variants within the series differ primarily by threshold voltage settings and package types, such as the W28 suffix indicating a specific voltage and package configuration within the broader product line.

Supervisors Replacement Considerations

Direct replacements include other CAT1161 variants with matching 2.8 V thresholds and compatible packages. Cross-reference with similar supervisory ICs offering integrated EEPROM if pin compatibility allows. Verify that substitute parts support the same I2C interface and watchdog functionality.