ASM809REURF-T

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage Supervisors

Characteristics: - Low Power Consumption - Reset Output with Active-Low and Open-Drain - Precision Voltage Monitor - Manual Reset Input - Watchdog Timer - Power-On Reset Delay Time: 100 ms (typical) - Operating Voltage Range: 1.2V to 5.5V - Temperature Range: -40°C to +85°C

Package: SOT-23-3

Essence: The ASM809REURF-T is a voltage supervisor IC that monitors the power supply voltage of a system and provides a reset signal when the voltage drops below a certain threshold.

Packaging/Quantity: The ASM809REURF-T is available in tape and reel packaging, with 3000 units per reel.

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Threshold Voltage Options: 2.93V, 3.08V, 3.15V, 4.38V, 4.63V, 4.75V
• Reset Timeout Period: 140 ms (typical)
• Quiescent Current: 1.0 µA (typical)
• Manual Reset Input Threshold Voltage: 0.8V (typical)
• Watchdog Timer Timeout Period: 1.6 s (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The ASM809REURF-T has three pins:

1. VDD: Power Supply Input
2. GND: Ground
3. RESET: Reset Output

Functional Features

• Voltage Monitoring: Monitors the power supply voltage and asserts the reset output when it falls below the threshold voltage.
• Manual Reset Input: Allows an external signal to assert a reset condition.
• Watchdog Timer: Provides a timeout period, after which the reset output is asserted if the watchdog input is not toggled.
• Power-On Reset Delay: Delays the assertion of the reset output for 100 ms after power is applied.

Advantages and Disadvantages

Advantages: - Low power consumption - Wide operating voltage range - Precision voltage monitoring - Small package size

Disadvantages: - Limited threshold voltage options

Working Principles

The ASM809REURF-T operates by continuously monitoring the power supply voltage. When the voltage drops below the selected threshold voltage, the reset output is asserted. The reset output remains active until the voltage rises above the threshold voltage or a manual reset input is triggered. The watchdog timer ensures that the reset output is asserted if the system fails to toggle the watchdog input within the specified timeout period.

Detailed Application Field Plans

The ASM809REURF-T is commonly used in various applications where reliable voltage monitoring and reset functionality are required. Some typical application fields include:

1. Microcontrollers and Microprocessors
2. Embedded Systems
3. Power Management Systems
4. Battery-Powered Devices
5. Industrial Control Systems
6. Automotive Electronics

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the ASM809REURF-T are:

1. MAX809: Voltage Supervisors with Manual Reset Input
2. TL7705: Supply Voltage Supervisors with Watchdog Timer
3. ADM708: Microprocessor Supervisory Circuits
4. TPS3808: Ultra-Low Quiescent Current Voltage Supervisors

These alternative models can be considered based on specific requirements and design constraints.

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