MAX809SQ308T1G

Product Overview

• Category: Integrated Circuit
• Use: Voltage Monitor
• Characteristics: Low Power, Precision Monitoring
• Package: SOT-23
• Essence: Supervisory Circuit
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Supply Voltage Range: 1.6V to 5.5V
• Threshold Voltage Options: 2.93V, 3.08V, 3.15V, 3.30V, 3.45V, 3.63V, 4.38V
• Reset Timeout Period: 140ms (min)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MAX809SQ308T1G has a SOT-23 package with three pins:

1. GND: Ground pin
2. RESET: Active-low reset output
3. VCC: Supply voltage input

Functional Features

• Monitors the supply voltage and asserts the reset output when it falls below the threshold voltage.
• Provides a stable reset signal during power-up, power-down, and brownout conditions.
• Low quiescent current consumption of typically 1µA.
• Open-drain RESET output allows easy interfacing with microcontrollers.

Advantages and Disadvantages

Advantages

• Wide supply voltage range allows compatibility with various systems.
• Multiple threshold voltage options provide flexibility in monitoring different voltage levels.
• Low power consumption extends battery life in portable applications.
• Small SOT-23 package saves board space.
• Reliable reset signal ensures proper system initialization.

Disadvantages

• Limited reset timeout period may not be suitable for all applications requiring longer delays.
• Single-channel design restricts monitoring of multiple voltage sources simultaneously.

Working Principles

The MAX809SQ308T1G is a supervisory circuit that monitors the supply voltage and generates a reset signal when it falls below a specified threshold. It ensures proper system operation by preventing erratic behavior during power-up, power-down, or brownout conditions.

The device compares the supply voltage with the internally set threshold voltage. When the supply voltage drops below the threshold, the reset output is asserted low. The reset remains active until the supply voltage rises above the threshold and the reset timeout period elapses.

Detailed Application Field Plans

The MAX809SQ308T1G finds applications in various fields where reliable voltage monitoring is crucial. Some potential application areas include:

1. Battery-Powered Devices: Ensuring proper shutdown and preventing data loss when the battery voltage drops below a safe level.
2. Microcontroller Systems: Providing a stable reset signal during power-up and brownout conditions to ensure correct initialization.
3. Industrial Control Systems: Monitoring power supply voltages to prevent damage to sensitive components during voltage fluctuations.
4. Automotive Electronics: Protecting critical systems from voltage dips and ensuring safe operation under varying conditions.

Detailed and Complete Alternative Models

• MAX809SEUR+: SOT-23 package, 2.93V threshold voltage, 140ms reset timeout
• MAX809TEXR+: SC70 package, 3.08V threshold voltage, 140ms reset timeout
• MAX809REXR+: SC70 package, 3.15V threshold voltage, 140ms reset timeout
• MAX809MEUR+: SOT-23 package, 3.30V threshold voltage, 140ms reset timeout
• MAX809MTEXR+: SC70 package, 3.45V threshold voltage, 140ms reset timeout
• MAX809MREXR+: SC70 package, 3.63V threshold voltage, 140ms reset timeout
• MAX809SEUR-T: SOT-23 package, 4.38V threshold voltage, 140ms reset timeout

These alternative models provide similar functionality with different threshold voltage options and package sizes to suit specific application requirements.

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