MAX821UUS+T

Product Overview

• Category: Integrated Circuit
• Use: Voltage Monitor
• Characteristics: Low-power, Precision, Adjustable Threshold
• Package: SOT-23-3
• Essence: Monitors voltage levels and provides an output signal based on the threshold set by the user.
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Supply Voltage Range: 1.8V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Threshold Voltage Options: Adjustable from 1.25V to 5V in 100mV steps
• Quiescent Current: 2µA (typical)
• Output Type: Active-Low Open-Drain
• Accuracy: ±1.5% (typical)

Pin Configuration

The MAX821UUS+T has a simple three-pin configuration:

1. GND: Ground connection
2. IN: Input voltage to be monitored
3. OUT: Active-low open-drain output

Functional Features

• Voltage Monitoring: The MAX821UUS+T monitors the input voltage and compares it with the user-defined threshold voltage.
• Adjustable Threshold: The threshold voltage can be easily adjusted using external resistors, allowing flexibility in monitoring different voltage levels.
• Low Power Consumption: With a quiescent current of only 2µA, the MAX821UUS+T is suitable for battery-powered applications.
• Precision: The device offers high accuracy with a typical deviation of ±1.5%.
• Open-Drain Output: The active-low open-drain output allows easy interfacing with other digital circuits.

Advantages and Disadvantages

Advantages: - Wide supply voltage range enables compatibility with various systems. - Adjustable threshold voltage provides versatility in voltage monitoring applications. - Low power consumption extends battery life in portable devices. - High accuracy ensures reliable voltage monitoring.

Disadvantages: - Limited number of threshold voltage options (100mV steps). - Open-drain output requires an external pull-up resistor for proper operation.

Working Principles

The MAX821UUS+T operates by comparing the input voltage with the user-defined threshold voltage. When the input voltage exceeds the threshold, the output goes low (active-low). Conversely, when the input voltage falls below the threshold, the output remains high impedance. The threshold voltage can be adjusted using external resistors connected to the IN pin.

Detailed Application Field Plans

The MAX821UUS+T finds applications in various fields, including:

1. Battery-Powered Systems: It can be used to monitor battery voltage levels and provide low-battery warnings.
2. Power Management: The device enables voltage monitoring in power supply circuits, ensuring stable operation.
3. Industrial Control Systems: It can be employed to monitor critical voltage levels in industrial control systems, triggering appropriate actions when thresholds are exceeded.
4. Automotive Electronics: The MAX821UUS+T is suitable for monitoring automotive battery voltage, enabling early detection of potential issues.

Detailed and Complete Alternative Models

1. MAX823UUS+T: Similar to MAX821UUS+T, but with a fixed threshold voltage of 2.5V.
2. MAX824UUS+T: Offers adjustable threshold voltage like MAX821UUS+T, but with a wider supply voltage range of 1.6V to 6V.
3. MAX825UUS+T: Provides adjustable threshold voltage and features a push-pull output instead of open-drain.

These alternative models offer similar functionality with slight variations in specifications, providing options to suit different application requirements.

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