ADM709LAR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Supervisor
• Characteristics: Low Power, Precision Monitoring, Reset Output
• Package: 8-Lead SOIC (Small Outline Integrated Circuit)
• Essence: Monitors the voltage level of a power supply and provides a reset signal when the voltage falls below a specified threshold.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Threshold Voltage Options: 2.63V, 3.08V, 4.38V, 4.63V
• Reset Timeout Period: Adjustable or Fixed (140ms, 280ms, 560ms, 1120ms)
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 10µA (typical)

Detailed Pin Configuration

The ADM709LAR has the following pin configuration:

1. VCC: Supply Voltage Input
2. GND: Ground
3. RESET: Active-Low Reset Output
4. MR: Manual Reset Input
5. CT: Capacitor Connection for Reset Timeout
6. TH: Threshold Voltage Selection
7. NC: No Connect
8. NC: No Connect

Functional Features

• Monitors the power supply voltage continuously
• Provides a reset signal when the voltage drops below the set threshold
• Reset output remains low until the voltage rises above the threshold and the reset timeout period elapses
• Manual reset input allows external control of the reset signal
• Adjustable reset timeout period for flexibility in different applications

Advantages

• Low power consumption, suitable for battery-powered devices
• Precise monitoring of voltage levels ensures reliable system operation
• Reset output remains stable until the voltage rises above the threshold and timeout period elapses, preventing false resets
• Wide supply voltage range allows compatibility with various power sources

Disadvantages

• Limited threshold voltage options may not cover all voltage monitoring requirements
• Fixed reset timeout periods may not be suitable for all applications requiring different timing intervals

Working Principles

The ADM709LAR operates by comparing the input voltage (VCC) with the selected threshold voltage (TH). When VCC falls below the threshold, the reset output (RESET) is activated, indicating a low-voltage condition. The reset output remains active until VCC rises above the threshold and the reset timeout period elapses. The manual reset input (MR) can also force the reset output to activate or deactivate.

Detailed Application Field Plans

The ADM709LAR is commonly used in various electronic systems where reliable voltage monitoring and reset functionality are required. Some application fields include:

1. Microcontrollers and Microprocessors: Ensures proper system initialization and prevents erratic behavior during power-up or voltage fluctuations.
2. Communication Systems: Provides reliable reset signals to reset microcontrollers, DSPs, or FPGAs when power supply voltage drops below the specified level.
3. Industrial Control Systems: Monitors power supply voltages in PLCs, motor control units, and other industrial equipment to prevent damage or data corruption during voltage dips.
4. Automotive Electronics: Ensures stable operation of automotive ECUs, sensors, and control modules by monitoring the battery voltage and initiating a reset if necessary.

Detailed and Complete Alternative Models

1. ADM708LAR: Similar to ADM709LAR but with fixed threshold voltage options of 2.93V, 4.63V, and 4.38V.
2. ADM811LAR: Voltage supervisor with a push-pull reset output and adjustable reset timeout period.
3. ADM6320LARJ45D2: Precision voltage monitor with a fixed threshold voltage of 4.5V and adjustable reset timeout period.

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