MAX708TCUA-T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Supervisor
• Characteristics: Low-power, microprocessor reset circuit
• Package: 8-pin µMAX® package
• Essence: Provides power-on reset and watchdog timer functions for microprocessors
• Packaging/Quantity: Tape and Reel packaging, 2500 units per reel

Specifications

• Supply Voltage Range: 1.0V to 5.5V
• Reset Threshold Voltage: 4.63V
• Watchdog Timeout Period: 1.6s
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MAX708TCUA-T has the following pin configuration:

| Pin Number | Pin Name | Description | |------------|----------|-------------| | 1 | GND | Ground | | 2 | RESET | Reset Output| | 3 | MR | Manual Reset Input | | 4 | VCC | Supply Voltage | | 5 | WDI | Watchdog Timer Input | | 6 | GND | Ground | | 7 | GND | Ground | | 8 | VCC | Supply Voltage |

Functional Features

• Provides a power-on reset signal during power-up and power-down conditions
• Monitors the supply voltage and asserts the reset output when it falls below the reset threshold voltage
• Includes a watchdog timer that requires periodic input pulses to prevent system lock-up
• Offers a manual reset input for immediate system reset
• Low quiescent current consumption, suitable for battery-powered applications

Advantages and Disadvantages

Advantages

• Ensures reliable system startup by providing a power-on reset signal
• Protects microprocessors from voltage fluctuations and brownout conditions
• Prevents system lock-up with the watchdog timer functionality
• Low-power consumption extends battery life in portable devices

Disadvantages

• Limited supply voltage range (1.0V to 5.5V)
• Fixed reset threshold voltage (4.63V)
• Watchdog timeout period cannot be adjusted

Working Principles

The MAX708TCUA-T monitors the supply voltage and generates a reset signal when it falls below the reset threshold voltage. This ensures that the microprocessor starts up correctly and avoids any undefined behavior during power-up or power-down conditions.

Additionally, the IC includes a watchdog timer that requires periodic input pulses to prevent system lock-up. If the microprocessor fails to provide these pulses within the specified timeout period, the MAX708TCUA-T asserts the reset output, forcing a system reset.

The manual reset input allows for an immediate system reset, overriding the normal operation of the IC.

Detailed Application Field Plans

The MAX708TCUA-T is commonly used in various applications where reliable microprocessor operation is critical. Some typical application fields include:

1. Embedded Systems: Provides power-on reset and watchdog timer functions for microcontrollers and other embedded systems.
2. Industrial Control Systems: Ensures proper startup and prevents system lock-up in industrial automation and control systems.
3. Automotive Electronics: Protects automotive microprocessors from voltage fluctuations and brownout conditions.
4. Medical Devices: Enables reliable operation of microcontrollers in medical equipment, ensuring patient safety.
5. Consumer Electronics: Used in portable devices like smartphones, tablets, and gaming consoles to maintain stable operation during power transitions.

Detailed and Complete Alternative Models

• MAX705CSA+: Similar functionality, different package (8-pin SOIC)
• MAX706TESA+: Adjustable reset threshold voltage, different package (8-pin SOIC)
• MAX707ESA+: Higher supply voltage range (1.8V to 5.5V), different package (8-pin SOIC)
• MAX809SEUR+: Push-pull output, different package (SOT23-3)

These alternative models offer similar voltage supervisor functionality with slight variations in features and specifications.

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