MAX631ACSA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitor
• Characteristics: Low-power, Precision, Adjustable Threshold
• Package: 8-pin Small Outline Integrated Circuit (SOIC)
• Essence: Monitors the voltage level of a power supply and provides a reset signal when the voltage falls below a certain threshold.
• Packaging/Quantity: Available in tubes or reels, with 250 units per tube/reel.

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Reset Threshold Voltage Options: Adjustable from 1.25V to 5V in 100mV increments
• Reset Timeout Period: Fixed at 140ms
• Quiescent Current: 10µA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MAX631ACSA has the following pin configuration:

1. RESET: Output reset signal
2. GND: Ground reference
3. VCC: Positive power supply input
4. MR: Manual reset input
5. TH: Threshold adjust input
6. CT: Capacitor connection for reset timeout
7. TR: Transistor collector output
8. VCC: Positive power supply input

Functional Features

• Voltage Monitoring: The MAX631ACSA continuously monitors the voltage level of the power supply.
• Adjustable Threshold: The threshold voltage can be adjusted using an external resistor divider network connected to the TH pin.
• Reset Signal Generation: When the monitored voltage falls below the set threshold, the MAX631ACSA generates a reset signal on the RESET pin.
• Manual Reset: The MR pin allows for manual reset by pulling it low.
• Reset Timeout: The reset signal remains active for a fixed period of 140ms after the voltage rises above the threshold.

Advantages and Disadvantages

Advantages: - Low-power consumption - Precision voltage monitoring - Adjustable threshold for flexibility - Small package size for space-constrained applications

Disadvantages: - Fixed reset timeout period may not be suitable for all applications - Limited supply voltage range (1.2V to 5.5V)

Working Principles

The MAX631ACSA operates by comparing the voltage at the TH pin with an internal reference voltage. When the voltage at TH falls below the set threshold, the internal comparator triggers and generates a reset signal on the RESET pin. The reset signal remains active for the fixed timeout period of 140ms after the voltage rises above the threshold.

Application Field Plans

The MAX631ACSA is commonly used in various electronic systems where reliable power supply monitoring is critical. Some application fields include:

1. Microcontrollers: Ensuring proper reset and initialization of microcontrollers upon power-up or voltage drop.
2. Industrial Control Systems: Monitoring power supply voltage to prevent malfunctions or damage to sensitive equipment.
3. Automotive Electronics: Providing reset signals to microcontrollers and other critical components during voltage fluctuations.
4. Battery-Powered Devices: Detecting low battery voltage and triggering appropriate actions or warnings.
5. Home Automation: Monitoring power supply integrity in smart home systems to maintain uninterrupted operation.

Alternative Models

1. MAX632ACSA: Similar to MAX631ACSA but with a different reset timeout period.
2. MAX638ACPA: Voltage monitor with adjustable threshold and push-pull output.
3. MAX630CSA: Voltage monitor with fixed threshold and open-drain output.

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

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