MAX690AESA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitor and Reset Circuit
• Characteristics: Low-power, precision voltage monitor with a built-in watchdog timer
• Package: 8-pin small outline integrated circuit (SOIC)
• Essence: Provides accurate monitoring and reset generation for microprocessor-based systems
• Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Watchdog Timer Timeout Period: Adjustable from 1.6s to 6.4s
• Reset Threshold Voltage: 4.63V (typical)
• Reset Timeout Period: 140ms (minimum)

Pin Configuration

The MAX690AESA has the following pin configuration:

```

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| | --| VCC GND |-- Pin 1: Ground (GND) --| MR RST |-- Pin 2: Active-Low Reset Output (RST) --| WDI VCC |-- Pin 3: Watchdog Input (WDI) --| RESET GND |-- Pin 4: Reset Input (RESET) --| NC NC |-- Pin 5: No Connection (NC) --| NC NC |-- Pin 6: No Connection (NC) --| NC NC |-- Pin 7: No Connection (NC) --| NC NC |-- Pin 8: No Connection (NC) |___________| ```

Functional Features

• Accurate monitoring of supply voltage and generation of reset signals
• Built-in watchdog timer for system integrity checking
• Precision voltage reference for reliable monitoring
• Power-on reset delay to ensure stable operation during power-up
• Low-power consumption for energy-efficient applications

Advantages and Disadvantages

Advantages: - Provides reliable voltage monitoring and reset generation - Adjustable watchdog timer timeout period for flexibility - Low-power operation extends battery life in portable devices - Small package size allows for space-saving designs

Disadvantages: - Limited number of pins restricts additional functionality - Not suitable for high-voltage applications above 5.5V

Working Principles

The MAX690AESA operates by continuously monitoring the supply voltage using a precision voltage reference. When the voltage drops below a preset threshold, the active-low reset output is asserted, signaling a system reset. The built-in watchdog timer ensures system integrity by requiring periodic input pulses. If the pulses are not received within the adjustable timeout period, a reset signal is generated.

Detailed Application Field Plans

The MAX690AESA is commonly used in microprocessor-based systems where accurate voltage monitoring and reset generation are critical. Some specific application fields include:

1. Embedded Systems: Ensures reliable operation of microcontrollers and other embedded devices.
2. Industrial Automation: Provides fault detection and recovery in industrial control systems.
3. Automotive Electronics: Monitors vehicle electronics to prevent malfunctions and ensure safety.
4. Medical Devices: Ensures proper functioning of medical equipment for patient safety.
5. Power Management: Facilitates efficient power management in battery-powered devices.

Detailed and Complete Alternative Models

1. MAX691AESA: Similar to MAX690AESA with additional features like manual reset input.
2. MAX809: Voltage monitor and reset circuits with different package options.
3. ADM708: Supervisory circuits with adjustable reset thresholds and watchdog timers.

These alternative models offer similar functionality and can be considered based on specific requirements and availability.

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