MAX691EWE

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 microprocessors and other digital systems
• Packaging/Quantity: Available in tape and reel packaging, with a quantity of 250 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: 15µA (typical)

Pin Configuration

The MAX691EWE has the following pin configuration:

1. VCC: Power supply input
2. GND: Ground reference
3. RESET: Active-low reset output
4. MR: Manual reset input
5. TH: Threshold adjust input
6. CT: Capacitor connection for reset timeout period adjustment
7. GND: Ground reference
8. RESET: Active-low reset output
9. RESET: Active-low reset output
10. GND: Ground reference
11. GND: Ground reference
12. GND: Ground reference
13. GND: Ground reference
14. GND: Ground reference
15. GND: Ground reference
16. VCC: 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 immediate system reset.
• Offers an adjustable threshold option to accommodate different voltage requirements.
• Low quiescent current consumption ensures minimal power usage.

Advantages and Disadvantages

Advantages: - Reliable voltage monitoring and reset generation for microprocessors and digital systems. - Adjustable threshold and timeout options provide flexibility in different applications. - Low-power consumption helps conserve energy.

Disadvantages: - Limited to a specific package type (16-pin wide SOIC). - Requires external capacitors for timeout period adjustment.

Working Principles

The MAX691EWE operates by continuously monitoring the power supply voltage. When the voltage falls below the specified threshold, the reset output is activated, indicating a power failure. The built-in reset timer keeps the reset output active for a specific period after the voltage rises above the threshold, ensuring a stable system restart. The manual reset input allows for immediate system reset when required.

Application Field Plans

The MAX691EWE is commonly used in various applications, including:

1. Microprocessor-based systems
2. Embedded systems
3. Industrial control systems
4. Communication equipment
5. Automotive electronics
6. Power management systems

Alternative Models

Alternative models that offer similar functionality to the MAX691EWE include:

1. MAX811: Voltage monitor and reset circuit with adjustable threshold and timeout options.
2. MAX1232: Precision voltage monitor and reset circuit with watchdog timer functionality.
3. ADM708: Supervisory circuit with adjustable reset threshold and timeout options.

These alternative models can be considered based on specific application requirements and compatibility with existing designs.

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