CAT823MSDI-GT3

Supervisors Overview

The CAT823MSDI-GT3 is a system supervisory voltage reset circuit manufactured by onsemi, designed to monitor electronic system voltages and maintain a reset output until the supply reaches a specified trip value. It features an internal timer with a minimum delay of 140 ms to allow power supply stabilization. The device includes a watchdog input for signal monitoring and supports manual reset via pushbutton override. It operates within a supply voltage range of 1.2 V to 5.5 V, with a typical operating current of 4 µA. Key electrical parameters include a threshold voltage of 2.32 V, an overvoltage threshold of 2.38 V, and an undervoltage threshold of 2.25 V. The maximum power dissipation is 571 mW, and it functions reliably across an industrial temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Provides basic reset and monitoring functions for electronic systems by maintaining a reset output until the monitored voltage reaches the specified trip value.
• Includes a watchdog input that monitors system signals and issues a reset if the signal fails to change state prior to a timeout.
• Supports manual reset through a pushbutton input for external override capabilities.
• Automatically restarts the microprocessor after a power failure event.

Supervisors Applications

• Microprocessor and Microcontroller based systems
• Intelligent Instruments
• Control Systems
• Critical µP Monitors
• Portable Equipment

Supervisors Procurement Notes

Verify the specific suffix 'MSDI' against official datasheets to confirm package type and pinout compatibility, as variations exist within the CAT823 family. Confirm availability status, as some variants may be discontinued or subject to limited distribution. Ensure the selected component meets the required voltage thresholds and thermal specifications for the target application environment before finalizing procurement.

Supervisors Selection Notes

Select this component when a low-power supervisory circuit with integrated watchdog functionality is required for systems operating between 1.2 V and 5.5 V. Consider the TSOT-23-5 package for space-constrained designs. Verify that the fixed threshold voltage aligns with the system's critical voltage levels. Ensure the application does not require battery backup switching, as this variant lacks that feature.

Supervisors Part Context

The CAT823MSDI-GT3 belongs to the CAT823/CAT824/CAT825 family of system supervisory circuits. These devices are designed to provide essential reset and monitoring functions for various electronic systems. The family offers pin-and-function compatibility with legacy parts like the MAX823/24/25, facilitating easier upgrades or replacements in existing designs while providing modern performance characteristics such as low quiescent current.

Supervisors Replacement Considerations

The CAT823STDI-GT3 is a pin and function compatible alternative within the same family. Verify that the specific threshold voltages and package dimensions match the design requirements before substitution. Check for any differences in manufacturing revisions or availability status between the two part numbers.