MAX634ESA+ - English Editing Encyclopedia Entry

Product Overview

Category

MAX634ESA+ belongs to the category of integrated circuits (ICs).

Use

This product is commonly used as a voltage reference and supervisory circuit.

Characteristics

• Voltage reference accuracy: ±1%
• Supply voltage range: 2.5V to 16V
• Operating temperature range: -40°C to +85°C
• Low quiescent current: 8µA (typical)
• Adjustable reset threshold voltage
• Open-drain reset output
• Small package size: SOIC-8

Package and Quantity

The MAX634ESA+ is available in an SOIC-8 package. It is typically sold in reels or tubes, with a quantity of 250 units per reel/tube.

Specifications

• Reference Voltage Accuracy: ±1%
• Supply Voltage Range: 2.5V to 16V
• Quiescent Current: 8µA (typical)
• Reset Threshold Voltage Range: Adjustable from 1.25V to 5V
• Reset Timeout Period: 140ms (typical)
• Output Type: Open-drain
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MAX634ESA+ has the following pin configuration:

```

---

| | --| VCC GND |-- Pin 1: Ground (GND) --| RESET OUT |-- Pin 2: Reset Output --| MR |-- Pin 3: Manual Reset Input --| VREF |-- Pin 4: Voltage Reference Output --| TH |-- Pin 5: Threshold Adjust --| TRIM |-- Pin 6: Trim --| VCC |-- Pin 7: Supply Voltage (VCC) --| GND |-- Pin 8: Ground (GND) |___________| ```

Functional Features

The MAX634ESA+ offers the following functional features:

1. Voltage Reference: It provides a stable and accurate reference voltage output.
2. Supervisory Circuit: Monitors the supply voltage and generates a reset signal when it falls below a certain threshold.
3. Adjustable Threshold: The threshold voltage can be adjusted using the TH pin, allowing customization for specific applications.
4. Reset Timeout: The reset output remains active for a fixed period after the supply voltage rises above the threshold, ensuring proper system initialization.
5. Open-Drain Output: The reset output is an open-drain configuration, providing flexibility in interfacing with other devices.

Advantages and Disadvantages

Advantages

• High accuracy voltage reference
• Low quiescent current consumption
• Adjustable threshold voltage
• Open-drain reset output for flexible interfacing

Disadvantages

• Limited operating temperature range (-40°C to +85°C)
• Requires external components for complete functionality

Working Principles

The MAX634ESA+ operates by comparing the supply voltage with a reference voltage. When the supply voltage drops below the adjustable threshold voltage, the reset output is activated. This signal can be used to initiate a system reset or perform other necessary actions. The reset output remains active for a fixed timeout period after the supply voltage rises above the threshold, ensuring proper system initialization.

Application Field Plans

The MAX634ESA+ finds applications in various fields, including but not limited to:

1. Power Management Systems: Provides voltage monitoring and reset functionality in power supply circuits.
2. Microcontroller Systems: Ensures reliable system startup and reset during power fluctuations.
3. Industrial Control Systems: Monitors critical voltages and triggers appropriate actions in case of power failures.
4. Automotive Electronics: Used in automotive systems to monitor battery voltage and initiate necessary actions.
5. Consumer Electronics: Provides voltage supervision in devices such as smart home systems, IoT devices, and portable electronics.

Alternative Models

1. MAX635ESA+: Similar to MAX634ESA+ but with a fixed threshold voltage of 4.63V.
2. MAX636ESA+: Offers additional features like a watchdog timer and adjustable reset timeout period.
3. MAX638ESA+: Provides a higher accuracy voltage reference of ±0.5% and adjustable threshold voltage.

These alternative models offer similar functionality with slight variations in specifications, allowing users to choose the most suitable option for their specific requirements.

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