MAX636ACPA

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitor and Reset Circuit
• Characteristics: Low-power, Precision, Adjustable Threshold Voltage
• Package: 8-pin PDIP (Plastic Dual In-line Package)
• Essence: Monitors the voltage level of a power supply and generates a reset signal when the voltage falls below a certain threshold.
• Packaging/Quantity: Tube packaging, 25 pieces per tube.

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Threshold Voltage Range: 1.25V to 5V
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 7µA (typical)

Detailed Pin Configuration

1. VCC: Power supply input
2. GND: Ground reference
3. MR: Manual Reset input
4. RESET: Reset output
5. THRESHOLD: Threshold voltage adjustment pin
6. CT: Capacitor connection for timing purposes
7. TRIG: Trigger input for watchdog timer
8. NC: No Connection

Functional Features

• Monitors the power supply voltage continuously.
• Generates a reset signal when the voltage drops below the set threshold.
• Adjustable threshold voltage allows customization for different applications.
• Provides a manual reset option through the MR pin.
• Includes a watchdog timer with a programmable trigger input.

Advantages

• Low-power consumption makes it suitable for battery-powered devices.
• Precision voltage monitoring ensures reliable operation.
• Adjustable threshold voltage accommodates various voltage levels.
• Small form factor and easy-to-use package simplify integration into circuits.
• Wide operating temperature range enables usage in harsh environments.

Disadvantages

• Limited number of pins restricts the number of external connections.
• Not suitable for applications requiring complex reset sequences.
• May require additional external components for specific applications.

Working Principles

The MAX636ACPA is designed to monitor the voltage level of a power supply. It compares the supply voltage with an internally set threshold voltage. When the supply voltage falls below the threshold, the reset output is activated, indicating a low-voltage condition. The threshold voltage can be adjusted using an external resistor connected to the THRESHOLD pin.

The IC also includes a watchdog timer that monitors the TRIG input. If the trigger input remains inactive for a certain period, the reset output is activated, providing a system reset. The timing for the watchdog function can be adjusted by connecting an external capacitor to the CT pin.

Detailed Application Field Plans

• Battery-powered devices: The low-power consumption and adjustable threshold voltage make the MAX636ACPA suitable for monitoring battery voltage levels in portable electronics.
• Embedded systems: The precision voltage monitoring and manual reset option are beneficial for ensuring reliable operation and facilitating system debugging.
• Industrial control systems: The wide operating temperature range and small form factor allow integration into industrial control circuits, providing voltage monitoring and reset functionality.

Detailed and Complete Alternative Models

1. MAX638ACPA: Similar to MAX636ACPA but with a fixed threshold voltage of 4.63V.
2. MAX631ACPA: Voltage monitor and reset circuit with a push-pull output configuration.
3. MAX6501UKP065+: Precision voltage monitor with adjustable threshold and integrated power-on reset.

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