MAX691ACWE+ - English Editing Encyclopedia Entry

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Supply Monitor
• Characteristics: Low-power, precision voltage monitor with a watchdog timer and manual reset input
• Package: 16-pin wide SOIC (Small Outline Integrated Circuit)
• Essence: Provides reliable power supply monitoring and reset generation for microprocessor systems
• Packaging/Quantity: Available in tape and reel packaging, with 250 units per reel

Specifications

• Supply Voltage Range: 3.0V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Watchdog Timer Timeout Period: Adjustable from 1.6s to 6.4s
• Manual Reset Input Threshold: 0.7V (typical)
• Reset Output Active Low: Sink current of 20mA (max)

Pin Configuration

The MAX691ACWE+ has the following pin configuration:

1. VCC - Positive Supply Voltage
2. GND - Ground
3. MR - Manual Reset Input
4. RESET - Reset Output
5. WDI - Watchdog Timer Input
6. GND - Ground
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 Supply Voltage

Functional Features

• Monitors the power supply voltage and generates a reset signal when it falls below a specified threshold.
• Includes a watchdog timer that requires periodic input pulses to prevent system lock-up.
• Provides a manual reset input for external reset control.
• Offers a reset output that can be used to reset the microprocessor or other system components.

Advantages and Disadvantages

Advantages: - Low-power consumption - Precision voltage monitoring - Adjustable watchdog timer timeout period - Manual reset input for external control

Disadvantages: - Limited sink current capability on the reset output (20mA max)

Working Principles

The MAX691ACWE+ continuously monitors the power supply voltage using an internal voltage reference. When the voltage falls below a specified threshold, it generates a reset signal to initiate a system reset. The watchdog timer requires periodic input pulses to prevent system lock-up. If the pulses are not received within the adjustable timeout period, a reset signal is generated. The manual reset input allows external control over the reset function.

Application Field Plans

The MAX691ACWE+ is commonly used in various microprocessor-based systems where reliable power supply monitoring and reset generation are critical. Some application fields include:

1. Embedded Systems: Used in industrial control systems, automotive electronics, and home automation.
2. Communication Equipment: Ensures proper operation of routers, switches, and network servers.
3. Medical Devices: Provides reliable reset functionality in medical equipment such as patient monitors and diagnostic devices.
4. Consumer Electronics: Used in smart home devices, gaming consoles, and audio/video equipment.

Alternative Models

• MAX691A - Similar features but available in a different package (DIP)
• MAX690 - Lower voltage range (2.7V to 5.5V) with similar functionality
• MAX809 - Single-supply voltage monitor with a fixed reset threshold

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