CAT809LSDI-T3

Supervisors Overview

The CAT809LSDI-T3 is a single-channel voltage supervisory circuit manufactured by onsemi, designed to monitor power supplies in digital systems. It operates within a supply voltage range of 1.2 V to 5.5 V and features a fixed under-voltage threshold of 4.63 V with an over-voltage threshold of 4.7 V. The device provides a push-pull active-low reset output with a standard reset delay time of 240 ms. It is housed in a compact SC-70-3 surface-mount package and supports an industrial operating temperature range from -40 °C to +85 °C.

Supervisors Feature Summary

• Monitors a single power supply rail for under-voltage and over-voltage conditions
• Generates a reset signal asserted low when the monitored voltage falls below the preset threshold
• Features a push-pull output driver capable of sourcing and sinking current

Supervisors Applications

• Monitoring power rails in portable battery-operated equipment
• Supervising voltage levels in handheld computers and laptops
• Ensuring system stability in test and measurement instruments

Supervisors Procurement Notes

Verify the specific suffix 'T3' indicates the tape-and-reel packaging configuration required for automated assembly processes. Confirm that the fixed 4.63 V threshold aligns with the target system's voltage requirements, as this parameter is not adjustable. Ensure the SC-70-3 footprint matches the design layout constraints.

Supervisors Selection Notes

Select this component when a fixed high-voltage threshold near 4.63 V is required for 5 V or 3.3 V system monitoring. Consider the low quiescent current of 8 uA for battery-powered applications where power efficiency is critical. The push-pull output eliminates the need for external pull-up resistors, simplifying the circuit design compared to open-drain alternatives.

Supervisors Part Context

This part belongs to the CAT809 series of microprocessor power supply supervisors produced by onsemi. These devices are engineered as direct replacements for legacy MAX809 components in industrial temperature range applications. The series offers various fixed threshold options to support standard logic families and power bus architectures.

Supervisors Replacement Considerations

The CAT809LSDI-T3 serves as a functional replacement for the Maxim Integrated MAX809 in compatible voltage threshold applications. Verify pinout compatibility and ensure the replacement package size fits the existing PCB footprint without mechanical interference.