MAX6421US31+T

Product Overview

• Category: Integrated Circuits (ICs)
• Use: Voltage Supervisors
• Characteristics: Low-Power, Single/Dual/Triple-Voltage Monitors with Manual Reset Input and Watchdog Timer
• Package: SOT-23-5
• Essence: The MAX6421US31+T is a low-power voltage supervisor IC that monitors up to three voltages and provides a manual reset input and a watchdog timer. It is designed for applications where reliable voltage monitoring is critical.
• Packaging/Quantity: Tape & Reel (3000 pieces per reel)

Specifications

• Supply Voltage Range: 1.6V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Output Type: Active-Low, Open-Drain
• Manual Reset Input Threshold: Adjustable
• Watchdog Timeout Period: Adjustable
• Quiescent Current: 3µA (typical)

Detailed Pin Configuration

The MAX6421US31+T has a total of five pins:

1. GND: Ground pin
2. MR: Manual reset input pin
3. RESET: Active-low reset output pin
4. VCC: Positive supply voltage pin
5. WD: Watchdog input pin

Functional Features

1. Voltage Monitoring: The MAX6421US31+T can monitor up to three different voltage levels simultaneously.
2. Manual Reset Input: The manual reset input allows the user to manually reset the device when necessary.
3. Watchdog Timer: The integrated watchdog timer ensures system integrity by resetting the device if a software or hardware failure occurs.
4. Adjustable Thresholds: The manual reset input threshold and watchdog timeout period can be adjusted to meet specific application requirements.
5. Low Power Consumption: The IC operates at a low quiescent current of only 3µA, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Reliable voltage monitoring for critical applications - Adjustable thresholds for customization - Low power consumption for extended battery life

Disadvantages: - Limited to monitoring up to three voltages simultaneously - Requires external components for proper operation

Working Principles

The MAX6421US31+T works by continuously monitoring the input voltages and comparing them to the adjustable threshold levels. If any of the monitored voltages fall below the set threshold, the active-low reset output is asserted, indicating a fault condition. Additionally, the watchdog timer must be periodically triggered to prevent a system reset. If the watchdog input is not toggled within the specified timeout period, the device will assert the reset output.

Detailed Application Field Plans

The MAX6421US31+T is commonly used in various applications where reliable voltage monitoring is crucial. Some potential application fields include:

1. Industrial Control Systems: The IC can monitor multiple power supply voltages in industrial control systems to ensure stable operation and prevent damage due to voltage fluctuations.
2. Automotive Electronics: It can be used in automotive electronics to monitor critical voltages and trigger a system reset if necessary, ensuring the safety and reliability of the vehicle's electrical systems.
3. Medical Devices: The MAX6421US31+T can provide voltage supervision in medical devices, such as patient monitors or infusion pumps, to ensure proper functioning and patient safety.
4. Home Automation: It can be utilized in home automation systems to monitor power supply voltages and trigger appropriate actions in case of voltage abnormalities, enhancing the overall system reliability.

Detailed and Complete Alternative Models

1. MAX6422US26+T: Similar to MAX6421US31+T but with a different voltage range (1.6V to 2.6V) and package (SOT-23-5).
2. MAX6423US31+T: Similar to MAX6421US31+T but with an additional manual reset input and a different package (SOT-23-6).
3. MAX6424US31+T: Similar to MAX6421US31+T but with four voltage monitoring channels and a different package (SOT-23-6).

(Note: This is not an exhaustive list of alternative models. Please refer to the manufacturer's datasheet for a complete list.)

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