ADM691AARWZ

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitor and Reset Generator
• Characteristics:
  • Monitors the power supply voltage of a system and generates a reset signal when the voltage falls below a specified threshold.
  • Provides reliable power-on reset (POR) functionality to ensure proper initialization of microprocessors, microcontrollers, and other digital systems.
• Package: Small Outline Integrated Circuit (SOIC)
• Essence: Ensures system stability by monitoring and controlling power supply voltage levels.
• Packaging/Quantity: Available in tape and reel packaging with a quantity of 2500 units per reel.

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Threshold Voltage Options: 2.93V, 3.08V, 4.63V, or adjustable
• Reset Timeout Period: 140ms (typical)
• Operating Temperature Range: -40°C to +85°C
• Output Type: Active Low
• Quiescent Current: 25µA (typical)

Detailed Pin Configuration

The ADM691AARWZ has the following pin configuration:

1. VCC: Power supply input
2. GND: Ground reference
3. MR: Manual reset input (active low)
4. RESET: Reset output (active low)
5. VTH: Voltage threshold selection input
6. CT: Capacitor connection for reset timeout adjustment

Functional Features

• Monitors the power supply voltage continuously.
• Generates a reset signal when the voltage drops below the set threshold.
• Provides a manual reset option through the MR pin.
• Offers multiple voltage threshold options for flexibility.
• Allows adjustment of the reset timeout period using an external capacitor.

Advantages

• Ensures reliable system startup and operation by providing power-on reset functionality.
• Protects sensitive digital systems from erratic behavior caused by insufficient power supply voltage.
• Offers flexibility with adjustable threshold voltage and reset timeout period.
• Compact SOIC package allows for easy integration into various electronic designs.

Disadvantages

• Requires an external capacitor for reset timeout adjustment, adding complexity to the circuit design.
• Limited to a maximum supply voltage of 5.5V, which may not be suitable for high-voltage applications.

Working Principles

The ADM691AARWZ operates by continuously monitoring the power supply voltage using an internal voltage comparator. When the voltage falls below the set threshold, the reset output is activated, indicating that the system should be reset. The reset signal remains active until the voltage rises above the threshold or a manual reset is triggered through the MR pin. The reset timeout period can be adjusted by connecting an external capacitor to the CT pin.

Detailed Application Field Plans

The ADM691AARWZ finds application in various electronic systems where reliable power-on reset functionality is crucial. Some potential application fields include:

1. Microprocessors and Microcontrollers: Ensures proper initialization and reliable operation of these digital devices.
2. Communication Systems: Provides stable reset functionality to prevent data corruption during power fluctuations.
3. Industrial Control Systems: Protects critical control circuits from voltage disturbances, ensuring safe and reliable operation.
4. Automotive Electronics: Ensures proper startup and operation of automotive control units, preventing malfunctions.

Detailed and Complete Alternative Models

1. ADM708RARZ: Similar voltage monitor and reset generator IC with adjustable threshold voltage and reset timeout period.
2. MAX809R: Voltage monitor and reset generator IC with fixed threshold voltage options and adjustable reset timeout period.
3. MCP101T: Voltage supervisor IC with fixed threshold voltage and integrated watchdog timer functionality.

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