MAX809SEUR-T

Product Overview

• Category: Integrated Circuits (ICs)
• Use: Voltage Supervisors
• Characteristics: Low Power, Reset Timer, Active-Low Push-Pull Output, Manual Reset Input
• Package: SOT-23-3
• Essence: MAX809SEUR-T is a voltage supervisor IC that monitors the power supply voltage of a system and provides a reset signal to the microcontroller or other digital devices when the voltage drops below a specified threshold.
• Packaging/Quantity: Tape & Reel (3000 pieces per reel)

Specifications

• Supply Voltage Range: 1.0V to 5.5V
• Threshold Voltage Options: 2.93V, 3.08V, 3.63V, 4.38V
• Reset Timeout Period: 140ms (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MAX809SEUR-T has three pins:

1. GND: Ground connection.
2. RESET: Active-low push-pull output that goes low when the monitored voltage falls below the threshold.
3. MR: Manual reset input that allows an external signal to force a reset.

Functional Features

• Low quiescent current consumption, making it suitable for battery-powered applications.
• Accurate voltage monitoring with selectable threshold options.
• Built-in reset timer ensures a stable reset signal is provided for a specific duration after the voltage rises above the threshold.
• Manual reset input allows external control over the reset function.

Advantages and Disadvantages

Advantages: - Wide supply voltage range enables compatibility with various systems. - Low power consumption extends battery life in portable devices. - Small package size saves board space. - Accurate voltage monitoring enhances system reliability.

Disadvantages: - Limited number of threshold voltage options may not meet the requirements of all applications. - Lack of adjustable reset timeout period may be a limitation in certain scenarios.

Working Principles

The MAX809SEUR-T operates by comparing the supply voltage with the selected threshold voltage. When the supply voltage drops below the threshold, the RESET pin goes low, indicating a reset condition. The reset signal remains active for a specific duration determined by the built-in reset timer after the voltage rises above the threshold.

Detailed Application Field Plans

The MAX809SEUR-T is commonly used in various electronic systems where reliable power supply monitoring and reset functionality are crucial. Some application fields include:

1. Microcontroller-based Systems: Provides a reset signal to microcontrollers when the power supply voltage falls below the specified threshold, ensuring proper system initialization.
2. Industrial Control Systems: Monitors power supply voltage in industrial control equipment to prevent malfunctions caused by voltage fluctuations.
3. Automotive Electronics: Ensures stable operation of automotive electronic systems by resetting microcontrollers or other critical components during voltage dips or spikes.
4. Battery-Powered Devices: Protects battery-powered devices from operating at low voltages that could lead to data corruption or improper functioning.

Detailed and Complete Alternative Models

1. MAX809SEXR-T: Similar to MAX809SEUR-T but comes in an extended temperature range (-40°C to +125°C).
2. MAX809MEUR-T: Offers a manual reset input with an open-drain output instead of push-pull.
3. MAX809REUR-T: Provides a higher reset timeout period of 560ms (typical) for applications requiring a longer delay.

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