MAX691ACWE+T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitor and Reset Circuit
• Characteristics: Low-power, precision voltage monitor with a built-in reset timer
• Package: 16-pin wide SOIC (Small Outline Integrated Circuit) package
• Essence: Provides reliable power supply monitoring and reset generation for microcontrollers and other digital systems
• Packaging/Quantity: Tape and reel packaging, 2500 units per reel

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Reset Threshold Voltage Options: 4.63V, 4.38V, 4.00V, or adjustable
• Reset Timeout Period Options: 140ms, 280ms, 560ms, or adjustable
• Quiescent Current: 10µA (typical)

Pin Configuration

The MAX691ACWE+T has the following pin configuration:

1. VCC - Positive Power Supply Input
2. GND - Ground
3. RESET - Active-Low Reset Output
4. MR - Manual Reset Input
5. TH - Threshold Input
6. CT - Capacitor Connection for Adjustable Reset Timeout
7. GND - Ground
8. GND - Ground
9. GND - Ground
10. GND - Ground
11. GND - Ground
12. GND - Ground
13. GND - Ground
14. GND - Ground
15. GND - Ground
16. VCC - Positive Power Supply Input

Functional Features

• Monitors the power supply voltage and generates a reset signal when the voltage falls below a specified threshold.
• Includes a built-in reset timer that ensures the reset signal remains active for a specific period after the power supply voltage rises above the threshold.
• Provides a manual reset input for external control of the reset signal.
• Offers options for adjustable threshold voltage and reset timeout period to suit different application requirements.
• Low quiescent current consumption makes it suitable for battery-powered devices.

Advantages and Disadvantages

Advantages: - Reliable power supply monitoring and reset generation - Wide supply voltage range allows compatibility with various systems - Adjustable threshold voltage and reset timeout period offer flexibility - Low-power operation extends battery life in portable devices

Disadvantages: - Limited number of available threshold voltage and reset timeout period options - Requires an external capacitor for adjustable reset timeout configuration

Working Principles

The MAX691ACWE+T operates by continuously monitoring the power supply voltage through the TH pin. When the voltage falls below the programmed threshold, the RESET output is activated, indicating a low-voltage condition. The built-in reset timer ensures that the RESET output remains active for a specific period after the power supply voltage rises above the threshold, allowing the system to stabilize before resuming normal operation.

Application Field Plans

The MAX691ACWE+T finds applications in various fields, including:

1. Microcontroller Systems: Provides reliable power-on reset functionality for microcontrollers, ensuring proper initialization and preventing erratic behavior during power-up.
2. Industrial Control Systems: Monitors power supply voltage in industrial control systems to ensure stable operation and prevent data corruption or equipment damage due to voltage fluctuations.
3. Automotive Electronics: Used in automotive electronic systems to monitor the vehicle's power supply and generate a reset signal if the voltage drops below a safe level, protecting critical components from potential damage.
4. Medical Devices: Ensures reliable operation of medical devices by monitoring the power supply voltage and generating a reset signal if necessary, preventing malfunctions or data loss.
5. Consumer Electronics: Used in various consumer electronic devices, such as smartphones, tablets, and gaming consoles, to provide voltage monitoring and reset functionality for stable operation.

Alternative Models

1. MAX691A - Similar functionality with different package options (DIP, SOIC, TSSOP)
2. MAX690 - Voltage monitor and reset circuit with adjustable threshold voltage and reset timeout period
3. MAX809 - Microprocessor supervisory circuits with various reset output options
4. MAX6325 - Precision voltage reference with low quiescent current consumption

These alternative models offer similar features and can be considered based on specific application requirements.

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