MAX821LUS+T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitor
• Characteristics: Low Power, Precision Monitoring, Adjustable Threshold
• Package: SOT-143
• Essence: Monitors voltage levels and provides an output signal based on the threshold set by the user.
• Packaging/Quantity: Tape & Reel, 3000 units per reel

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Threshold Voltage Range: 1.25V to 5V
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 7µA (typical)
• Output Type: Active-Low Open-Drain
• Accuracy: ±1.5% (typical)

Pin Configuration

The MAX821LUS+T has a total of 4 pins:

1. GND: Ground connection
2. IN: Input voltage to be monitored
3. SET: Threshold voltage setting pin
4. OUT: Output signal indicating voltage status

Functional Features

• Voltage Monitoring: The MAX821LUS+T monitors the input voltage and compares it with the threshold voltage set by the user.
• Adjustable Threshold: The threshold voltage can be adjusted using an external resistor connected to the SET pin.
• Precision Monitoring: The IC provides accurate monitoring with a typical accuracy of ±1.5%.
• Low Power Consumption: With a quiescent current of only 7µA, the MAX821LUS+T is designed for low power applications.

Advantages and Disadvantages

Advantages: - Wide supply voltage range allows compatibility with various systems. - Adjustable threshold voltage provides flexibility in voltage monitoring. - Low power consumption makes it suitable for battery-powered devices. - Accurate monitoring ensures reliable voltage detection.

Disadvantages: - Limited to monitoring a single voltage level. - Output signal is active-low open-drain, which may require additional circuitry for certain applications.

Working Principles

The MAX821LUS+T operates by comparing the input voltage with the threshold voltage set by the user. When the input voltage exceeds the threshold voltage, the output signal on the OUT pin becomes low. Conversely, when the input voltage falls below the threshold, the output signal becomes high impedance. This functionality allows the IC to provide a simple and reliable indication of voltage status.

Detailed Application Field Plans

The MAX821LUS+T finds applications in various fields where voltage monitoring is crucial. Some potential application areas include:

1. Battery-Powered Devices: The IC can be used to monitor battery voltage levels and trigger actions when they fall below a certain threshold, such as displaying a low battery warning or initiating a shutdown sequence.
2. Power Supply Units: It can be employed in power supply units to detect overvoltage or undervoltage conditions and activate protective measures, such as shutting down the system or triggering an alarm.
3. Industrial Control Systems: The IC can be utilized in industrial control systems to monitor critical voltages and ensure proper functioning of equipment, preventing damage due to voltage fluctuations.

Detailed and Complete Alternative Models

1. MAX823LUS+T: Similar to MAX821LUS+T, but with a different package (SOT-23) and slightly different specifications.
2. MAX809LUS+T: Voltage monitor with a fixed threshold voltage and push-pull output type. Suitable for applications requiring a different output configuration.
3. MAX638LUS+T: Voltage monitor with adjustable threshold and a built-in watchdog timer. Ideal for applications that require both voltage monitoring and system reset functionality.

(Note: The above alternative models are just a few examples and not an exhaustive list.)

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