MAX811SEUS-T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitor with Manual Reset
• Characteristics: Low-power, precision voltage monitor with manual reset input and watchdog timer
• Package: SOT-143
• Essence: Monitors the power supply voltage of a system and asserts a reset signal if the voltage falls below a predetermined threshold
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Supply Voltage Range: 1.6V to 6.0V
• Threshold Voltage Options: 2.93V, 3.08V, 3.63V, 4.38V, 4.63V, 4.88V, 5.0V
• Manual Reset Input: Active-low push-pull or open-drain output
• Watchdog Timer: Programmable timeout period (1.6s, 3.2s, 6.4s, or 12.8s)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MAX811SEUS-T has the following pin configuration:

____ RESET | | VCC | | GND |____| MR

• RESET: Output pin for asserting the reset signal
• VCC: Power supply voltage input
• GND: Ground reference
• MR: Manual reset input pin

Functional Features

• Monitors the power supply voltage and asserts a reset signal if it falls below the programmed threshold
• Provides a manual reset input for immediate system reset
• Includes a watchdog timer to detect system malfunctions and initiate a reset if necessary
• Low-power consumption for energy-efficient operation
• Small package size for space-constrained applications

Advantages and Disadvantages

Advantages: - Precise voltage monitoring ensures reliable system operation - Manual reset input allows for immediate system recovery - Watchdog timer enhances system reliability by detecting malfunctions - Low-power consumption prolongs battery life in portable devices

Disadvantages: - Limited threshold voltage options may not suit all applications - SOT-143 package may be challenging to solder for inexperienced users

Working Principles

The MAX811SEUS-T operates by continuously monitoring the power supply voltage using an internal voltage reference. If the voltage falls below the programmed threshold, the device asserts a reset signal on the RESET pin. This signal remains active until the voltage rises above the threshold or a manual reset is initiated.

The manual reset input (MR) allows the system to be reset immediately, regardless of the monitored voltage level. This feature is useful in situations where a manual intervention is required to recover from a fault condition.

Additionally, the MAX811SEUS-T includes a watchdog timer that can be programmed to monitor the system's activity. If the watchdog timer does not receive a periodic pulse within the programmed timeout period, it will initiate a system reset.

Detailed Application Field Plans

The MAX811SEUS-T is commonly used in various applications where reliable voltage monitoring and system reset functionality are crucial. Some typical application fields include:

1. Embedded Systems: Provides voltage monitoring and reset capabilities for microcontrollers, DSPs, and other embedded systems.
2. Industrial Control Systems: Ensures stable operation of control units, PLCs, and automation equipment by monitoring power supply voltages.
3. Automotive Electronics: Protects sensitive automotive electronics from voltage fluctuations and initiates system resets when necessary.
4. Medical Devices: Monitors power supply integrity in medical equipment, ensuring patient safety and system reliability.
5. Consumer Electronics: Used in devices such as smart home systems, IoT devices, and portable electronics to maintain stable operation.

Detailed and Complete Alternative Models

• MAX811LEUS-T: Similar to MAX811SEUS-T but with a different package (SOT-23)
• MAX811MEUS-T: Voltage monitor with manual reset and adjustable threshold voltage options
• MAX811REUS-T: Voltage monitor with manual reset and active-high reset output
• MAX811TEUS-T: Voltage monitor with manual reset and open-drain reset output

These alternative models offer similar functionality with slight variations in package type, threshold voltage options, or reset output characteristics.