MAX638AESA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitor and Reset Circuit
• Characteristics: Low-power, precision voltage monitoring, adjustable reset threshold, small package size
• Package: 8-pin SOIC (Small Outline Integrated Circuit)
• Essence: The MAX638AESA is a voltage monitor and reset circuit designed to monitor the power supply voltage of electronic systems and provide a reset signal when the voltage falls below a certain threshold.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Reset Threshold Voltage Options: Adjustable from 1.25V to 4.63V in 100mV increments
• Reset Timeout Period: Fixed at 140ms
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 10µA (typical)

Pin Configuration

The MAX638AESA features an 8-pin SOIC package with the following pin configuration:

1. GND (Ground)
2. MR (Manual Reset Input)
3. RESET (Reset Output)
4. VCC (Power Supply)
5. TH (Threshold Adjust)
6. CT (Capacitor Connection)
7. NC (No Connect)
8. NC (No Connect)

Functional Features

• Monitors the power supply voltage and generates a reset signal when the voltage drops below the set threshold.
• Provides a manual reset input for immediate system reset.
• Adjustable reset threshold allows customization for different voltage levels.
• Fixed reset timeout period ensures proper system reset even during short power interruptions.
• Low quiescent current minimizes power consumption.

Advantages

• Precise voltage monitoring helps prevent system malfunctions due to low power supply.
• Adjustable reset threshold provides flexibility for different voltage requirements.
• Small package size saves board space in compact electronic designs.
• Low quiescent current reduces power consumption, making it suitable for battery-powered applications.

Disadvantages

• Fixed reset timeout period may not be suitable for all applications requiring longer or shorter reset times.
• Limited number of pin options may restrict its use in complex circuit designs.

Working Principles

The MAX638AESA operates by continuously monitoring the power supply voltage using an internal voltage reference and comparator. When the voltage falls below the set threshold, the reset output is activated, signaling a system reset. The reset signal remains active for the fixed timeout period, ensuring proper system initialization. The threshold voltage can be adjusted using an external resistor connected to the TH pin.

Application Field Plans

The MAX638AESA is commonly used in various electronic systems where reliable voltage monitoring and reset functionality are required. Some application fields include:

1. Microcontrollers and microprocessors
2. Embedded systems
3. Industrial control systems
4. Power management circuits
5. Battery-powered devices

Alternative Models

• MAX638AESD: 14-pin SOIC package with additional features such as watchdog timer and adjustable reset timeout.
• MAX638AESA+T: Same as MAX638AESA but available in a smaller SOT23 package.
• MAX638AESA-T: Tape and reel packaging with 3000 units per reel.

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

This entry provides an overview of the MAX638AESA voltage monitor and reset circuit. It includes basic information about the product, specifications, pin configuration, functional features, advantages, disadvantages, working principles, application field plans, and alternative models.