CAT823LSDI-GT3

Supervisors Overview

The CAT823LSDI-GT3 is a system supervisory voltage reset circuit manufactured by onsemi. It operates within a supply voltage range of 1.2 V to 5.5 V and features a fixed threshold voltage of 2.63 V. The device provides an active low, open-drain output and includes a manual reset input for user-initiated resets. It integrates a watchdog timer with a timeout period of approximately 140 ms. The component is housed in a TSOT-23-5 surface-mount package and supports operation across a temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Integrates a watchdog timer with automatic system reset capability upon timeout failure
• Provides manual reset functionality via dedicated input pin for controlled system restarts
• Features open-drain output configuration suitable for wired-OR connections

Supervisors Applications

• Portable battery-powered equipment requiring low quiescent current
• Microprocessor-based systems needing reliable power-on reset sequences
• Embedded controllers requiring watchdog protection against software faults

Supervisors Procurement Notes

Verify the specific suffix GT3 confirms tape-and-reel packaging if reel quantity is required for assembly. Confirm RoHS compliance status through official datasheets as environmental declarations may vary by production batch. Check end-of-life notices as this component series has faced discontinuation risks from the manufacturer. Ensure the open-drain output matches the pull-up requirements of the target logic interface.

Supervisors Selection Notes

Select this component when a fixed 2.63 V threshold is appropriate for the monitored rail. The open-drain output requires an external pull-up resistor; verify the resistor value aligns with the desired rise time and logic level. The manual reset feature necessitates a connection to a push-button or control signal. Ensure the 140 ms watchdog timeout meets the maximum instruction cycle duration of the processor.

Supervisors Part Context

This part belongs to the CAT823 family of supervisory circuits designed for voltage monitoring and system reset generation. It succeeds earlier Catalyst Semiconductor designs now integrated into onsemi's standard product portfolio. The TSOT-23-5 package offers a compact footprint compared to larger SOIC options, facilitating use in space-constrained portable devices.

Supervisors Replacement Considerations

CAT823RTDI-GT3: Features push-pull output instead of open-drain. CAT823TTDI-GT3: Different threshold voltage options available. Verify electrical compatibility before substitution.