MAX6428EHUR+T

Product Overview

• Category: Integrated Circuits (ICs)
• Use: Voltage Supervisors
• Characteristics: Low Power, Adjustable Reset Timeout, Active-Low Reset Output, Manual Reset Input, Watchdog Timer, Power-On Reset Delay Time, Push-Pull, Open Drain Output, 2.5V to 5.5V Operating Voltage Range
• Package: SOT-23-3
• Essence: The MAX6428EHUR+T is a voltage supervisor IC that monitors the power supply voltage of a system and provides reset signals to the microcontroller or other devices when the voltage falls below a certain threshold.
• Packaging/Quantity: Tape & Reel (3000 pieces per reel)

Specifications

• Supply Voltage Range: 2.5V to 5.5V
• Reset Threshold Voltage Options: 1.575V, 2.32V, 2.63V, 3.08V, 4.38V
• Reset Timeout Period Options: 1.6ms, 10ms, 100ms, 1.6s, 16s
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 3µA (typical)

Detailed Pin Configuration

The MAX6428EHUR+T has three pins:

1. GND: Ground connection.
2. RESET: Active-low reset output.
3. MR: Manual reset input.

Functional Features

• Adjustable Reset Timeout: The reset timeout period can be configured using external capacitors.
• Active-Low Reset Output: The RESET pin goes low when the monitored voltage falls below the threshold.
• Manual Reset Input: The MR pin allows for manual resetting of the device.
• Watchdog Timer: Monitors the system's activity and generates a reset signal if no activity is detected within a specified time.
• Power-On Reset Delay Time: Ensures that the system remains in reset for a specific duration after power is applied.
• Push-Pull, Open Drain Output: The RESET pin can be configured as either push-pull or open drain output.

Advantages and Disadvantages

Advantages: - Wide operating voltage range allows for compatibility with various systems. - Adjustable reset timeout provides flexibility in system design. - Low quiescent current minimizes power consumption. - Small package size (SOT-23-3) enables space-saving designs.

Disadvantages: - Limited number of available reset threshold voltage options. - No built-in hysteresis feature.

Working Principles

The MAX6428EHUR+T monitors the supply voltage using an internal voltage reference and comparator. When the voltage falls below the set threshold, the RESET pin goes low, indicating a reset condition. The reset timeout period determines how long the RESET pin remains low after the voltage rises above the threshold. The device also includes a watchdog timer that generates a reset signal if no system activity is detected within a specified time.

Detailed Application Field Plans

The MAX6428EHUR+T is commonly used in various applications where reliable voltage monitoring and reset functionality are required. Some potential application fields include:

1. Microcontroller Systems: Provides a reset signal to the microcontroller when the power supply voltage drops below a certain level, ensuring proper system initialization.
2. Industrial Control Systems: Monitors the power supply voltage in industrial control systems to prevent malfunctions or data corruption during voltage fluctuations.
3. Automotive Electronics: Ensures proper operation of automotive electronic systems by generating reset signals when the supply voltage deviates from the desired range.
4. Battery-Powered Devices: Protects battery-powered devices from damage due to undervoltage conditions by initiating a reset or shutdown sequence.

Detailed and Complete Alternative Models

1. MAX6429EHUR+T: Similar to the MAX6428EHUR+T, but with additional features such as a manual reset timeout option and adjustable hysteresis.
2. MAX6430EHUR+T: Offers a wider range of reset threshold voltage options and higher operating temperature range compared to the MAX6428EHUR+T.
3. MAX6431EHUR+T: Provides a push-pull output configuration for the RESET pin, allowing for more flexibility in system design.

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