MAX709TCPA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Supply Monitor
• Characteristics: Low-power, precision voltage monitor with reset output
• Package: 8-pin PDIP (Plastic Dual In-Line Package)
• Essence: Monitors the voltage level of a power supply and provides a reset signal when the voltage falls below a specified threshold.
• Packaging/Quantity: Available in tubes or tape and reel packaging, with a quantity of 25 units per tube/reel.

Specifications

• Supply Voltage Range: 1.0V to 6.0V
• Reset Threshold Voltage Options: 2.5V, 3.0V, 3.3V, 5.0V
• Reset Timeout Period: Adjustable from 1ms to 640ms
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 10µA (typical)

Pin Configuration

The MAX709TCPA has the following pin configuration:

1. GND: Ground connection
2. RESET: Active-low reset output
3. VCC: Positive supply voltage input
4. MR: Reset timeout period adjustment pin
5. TH: Reset threshold voltage selection pin
6. CT: Capacitor connection for reset timeout adjustment
7. NC: No connection (unused pin)
8. VCC: Positive supply voltage input

Functional Features

• Monitors the supply voltage and generates a reset signal when it falls below the selected threshold voltage.
• Provides an active-low reset output that remains low until the supply voltage rises above the threshold voltage and the reset timeout period elapses.
• The reset timeout period can be adjusted using an external capacitor connected to the CT pin.
• Offers multiple reset threshold voltage options to suit different applications.
• Low quiescent current consumption makes it suitable for battery-powered devices.

Advantages and Disadvantages

Advantages: - Precise voltage monitoring ensures reliable system operation. - Adjustable reset timeout period allows customization for specific requirements. - Low-power consumption extends battery life in portable devices. - Wide supply voltage range enables compatibility with various power sources.

Disadvantages: - Limited number of available reset threshold voltage options. - The 8-pin PDIP package may not be suitable for space-constrained applications.

Working Principles

The MAX709TCPA operates by continuously monitoring the supply voltage connected to the VCC pin. When the voltage falls below the selected threshold voltage (determined by the TH pin), the RESET pin is pulled low, indicating a reset condition. The reset output remains low until the supply voltage rises above the threshold voltage and the reset timeout period elapses. The reset timeout period can be adjusted using an external capacitor connected to the CT pin.

Detailed Application Field Plans

The MAX709TCPA is commonly used in various electronic systems where reliable power supply monitoring is crucial. Some typical application fields include:

1. Microcontroller Systems: Ensures proper system initialization and prevents erratic behavior during power-up or voltage fluctuations.
2. Industrial Control Systems: Provides reliable reset signals to ensure safe and controlled operation of machinery and equipment.
3. Automotive Electronics: Monitors the vehicle's power supply to prevent malfunctions and ensure proper functioning of critical systems.
4. Battery-Powered Devices: Protects batteries from over-discharge by initiating a reset when the voltage drops below a certain level.
5. Home Automation Systems: Ensures stable operation of smart home devices by monitoring the power supply and initiating resets if necessary.

Detailed and Complete Alternative Models

1. MAX708TCPA: Similar to MAX709TCPA but with fixed reset threshold voltage options of 4.63V and 4.38V.
2. MAX706TCPA: Low-power voltage monitor with fixed reset threshold voltage options of 4.63V and 4.38V, but without the adjustable reset timeout feature.
3. MAX811TCPA: Voltage monitor with a push-pull output and fixed reset threshold voltage options of 2.93V and 4.63V.

(Note: This is not an exhaustive list of alternative models. Please refer to the manufacturer's documentation for a complete list of available alternatives.)

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