ADM709SARZ

Supervisors Overview

The ADM709SARZ is a voltage supervisory circuit manufactured by Analog Devices Inc., designed to monitor power supply integrity in electronic systems. It operates within a supply voltage range of 2.7 V to 5.5 V and features a threshold voltage of 2.93 V for detecting under-voltage conditions. The device provides a push-pull output type with a reset delay time of 380 ms, ensuring stable system recovery after power events. It functions without manual reset or watchdog timer capabilities and consumes a typical operating current of 200 uA. The component is housed in an SOIC-8 surface-mount package and supports industrial temperature ranges from -40°C to +85°C.

Supervisors Feature Summary

• Provides automatic power-on reset generation with a fixed delay period to ensure processor stability during power-up sequences.
• Features a push-pull output driver capable of directly interfacing with digital logic inputs without requiring external pull-up resistors.
• Monitors a single input channel for voltage deviations against a precise internal reference threshold.

Supervisors Applications

• Microcontroller and microprocessor power supply monitoring
• Battery-operated devices requiring low standby current
• Industrial control systems needing reliable reset signals

Supervisors Procurement Notes

Verify the specific suffix 'SARZ' to confirm the SOIC-8 package and lead-free composition. Confirm availability status as distribution channels may indicate limited stock or end-of-life transitions. Ensure the required threshold voltage of 2.93 V aligns with the target system's logic levels before procurement.

Supervisors Selection Notes

Select this component when a fixed 2.93 V threshold is appropriate for the monitored rail. Consider the 380 ms reset delay duration relative to the system's startup requirements. Evaluate the 200 uA quiescent current against battery life constraints. Verify that the SOIC-8 footprint fits the PCB layout constraints compared to alternative packages like MSOP or TSSOP.

Supervisors Part Context

The ADM709 series belongs to Analog Devices' portfolio of simple supervisor circuits focused on basic power management tasks. Unlike complex PMICs, these devices offer dedicated reset functionality without additional communication interfaces. The ADM709SARZ represents a standard variant within this family, prioritizing cost-effectiveness and ease of integration for fundamental voltage supervision needs.

Supervisors Replacement Considerations

Public confirmed substitute part numbers include MAX709SCSA+ from Analog Devices/Maxim Integrated. Verify pin compatibility and electrical parameter alignment, specifically the threshold voltage and reset delay times, before substituting.