MIC809LU-TR

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Supervisor

Characteristics: - Low-power microprocessor reset circuit - Precision voltage monitor for 3.3V systems - Active-low reset output - Manual reset input - Power-on reset delay time of 140ms (typical) - Open-drain reset output - Small SOT-23-3 package

Package: SOT-23-3

Essence: The MIC809LU-TR is a low-power microprocessor reset circuit designed to monitor the power supply voltage in 3.3V systems. It provides an active-low reset output and a manual reset input, ensuring reliable system operation.

Packaging/Quantity: The MIC809LU-TR is available in a small SOT-23-3 package. It is typically sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage Range: 1.0V to 5.5V
• Reset Threshold Voltage: 2.93V (typical)
• Reset Timeout Period: 140ms (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MIC809LU-TR has three pins:

1. VCC: Power supply input pin.
2. GND: Ground reference pin.
3. RESET: Active-low reset output.

Functional Features

• Voltage Monitoring: The MIC809LU-TR continuously monitors the supply voltage and asserts the reset output when the voltage drops below the specified threshold.
• Manual Reset Input: The manual reset input allows external control over the reset function, enabling system reset even if the supply voltage is within the acceptable range.
• Power-On Reset Delay: The device incorporates a power-on reset delay of 140ms, ensuring stable power supply before releasing the reset signal.
• Open-Drain Reset Output: The active-low reset output is an open-drain configuration, allowing easy interfacing with other devices.

Advantages and Disadvantages

Advantages: - Low-power consumption - Precision voltage monitoring - Small package size - Manual reset capability

Disadvantages: - Limited to 3.3V systems - Single threshold voltage option

Working Principles

The MIC809LU-TR operates by comparing the supply voltage against a fixed threshold voltage. When the supply voltage drops below the threshold, the reset output is asserted, indicating a power failure or unstable condition. The reset output remains active until the supply voltage rises above the threshold and the power-on reset delay period elapses.

Application Field Plans

The MIC809LU-TR is commonly used in various applications where reliable voltage monitoring and system reset functionality are required. Some potential application fields include:

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

Alternative Models

Here are some alternative models that offer similar functionality to the MIC809LU-TR:

1. MAX809: Low-Power Microprocessor Reset Circuits
2. LTC2937: Triple Supply Monitor and Reset Circuit
3. TPS3808: Voltage Supervisor with Programmable Delay Time

These alternative models provide voltage monitoring and reset capabilities suitable for different system requirements.

In conclusion, the MIC809LU-TR is a low-power microprocessor reset circuit designed for voltage monitoring in 3.3V systems. It offers precision monitoring, manual reset input, and a small package size. While it has limitations such as being limited to 3.3V systems, it provides essential features for ensuring reliable system operation in various applications.