ICL7665AESA+T

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Supervisor

Characteristics: - Monitors the power supply voltage and provides a reset signal when the voltage falls below a predetermined threshold. - Ensures proper operation of microcontrollers, microprocessors, and other digital systems by preventing them from operating in an undefined state during power-up or power-down.

Package: SOIC-8

Essence: The ICL7665AESA+T is a voltage supervisor IC that ensures reliable operation of digital systems by monitoring the power supply voltage and generating a reset signal when the voltage drops below a specified level.

Packaging/Quantity: The ICL7665AESA+T is available in a surface-mount SOIC-8 package. It is typically sold in reels containing 2500 units.

Specifications

• Supply Voltage Range: 1.0V to 40V
• Reset Threshold Voltage: Adjustable from 1.2V to 36V
• Reset Timeout Period: Adjustable from 1ms to 10s
• Quiescent Current: 20µA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The ICL7665AESA+T has the following pin configuration:

____ RESET | | VCC GND | | THRES | | TIMEOUT | | RESET ----

• RESET: Output pin for the reset signal.
• VCC: Power supply voltage input.
• GND: Ground reference.
• THRES: Input pin for setting the reset threshold voltage.
• TIMEOUT: Input pin for setting the reset timeout period.

Functional Features

1. Voltage Monitoring: The ICL7665AESA+T continuously monitors the power supply voltage and compares it with the threshold voltage set by the THRES pin.
2. Reset Signal Generation: When the power supply voltage falls below the threshold voltage, the ICL7665AESA+T generates a reset signal on the RESET pin.
3. Adjustable Threshold and Timeout: The THRES and TIMEOUT pins allow users to adjust the reset threshold voltage and timeout period according to their specific requirements.
4. Low Quiescent Current: The IC has a low quiescent current of 20µA, minimizing power consumption.

Advantages

• Ensures reliable operation of digital systems during power-up and power-down.
• Adjustable threshold and timeout settings provide flexibility for different applications.
• Low quiescent current minimizes power consumption.
• Compact SOIC-8 package allows for easy integration into various circuit designs.

Disadvantages

• Limited to monitoring power supply voltages within the specified range (1.0V to 40V).
• Requires external components for setting the threshold voltage and timeout period.

Working Principles

The ICL7665AESA+T operates by comparing the power supply voltage with the threshold voltage set by the user. If the power supply voltage drops below the threshold voltage, the IC generates a reset signal, which can be used to reset microcontrollers, microprocessors, or other digital systems. The timeout period determines how long the reset signal remains active after the power supply voltage returns to normal.

Application Field Plans

The ICL7665AESA+T is widely used in various applications where reliable voltage monitoring and reset functionality are required. Some potential application fields include:

1. Embedded Systems: Used to ensure proper initialization and safe shutdown of microcontroller-based embedded systems.
2. Industrial Automation: Provides voltage supervision for control systems, preventing erratic behavior during power fluctuations.
3. Telecommunications: Ensures stable operation of communication equipment by resetting the system in case of power supply voltage drops.
4. Automotive Electronics: Monitors the vehicle's power supply voltage to prevent malfunctions and ensure safe operation of electronic systems.

Alternative Models

1. MAX809: Voltage supervisor IC with similar functionality, available in various package options.
2. ADM708: Microprocessor supervisory circuit with adjustable reset threshold and timeout period.
3. TPS3839: Ultra-low-power voltage supervisor with a wide supply voltage range and adjustable reset threshold.

These alternative models offer similar features and can be considered as substitutes for the ICL7665AESA+T based on specific application requirements.

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