MAX691CWE+T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitor and Reset Circuit
• Characteristics: Low-power, precision voltage monitoring, reset generation
• Package: 16-pin Wide SOIC (Small Outline Integrated Circuit)
• Essence: Provides a reliable way to monitor the power supply voltage and generate a reset signal when the voltage falls below a certain threshold.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Threshold Voltage Options: 4.65V, 4.40V, 4.00V, 3.08V, 2.93V, 2.63V, 2.32V, 2.06V
• Reset Timeout Period: Adjustable from 1ms to 640ms
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 10µA (typical)

Pin Configuration

The MAX691CWE+T has a 16-pin Wide SOIC package with the following pin configuration:

1. VCC: Supply Voltage Input
2. GND: Ground
3. RESET: Active-Low Reset Output
4. MR: Manual Reset Input
5. TH: Threshold Voltage Selection Input
6. CT: Capacitor Connection for Reset Timeout
7. GND: Ground
8. GND: Ground
9. GND: Ground
10. GND: Ground
11. GND: Ground
12. GND: Ground
13. GND: Ground
14. GND: Ground
15. GND: Ground
16. VCC: Supply Voltage Input

Functional Features

• Monitors the supply voltage and generates a reset signal when the voltage drops below the set threshold.
• Provides an adjustable reset timeout period to ensure proper system initialization.
• Offers manual reset capability through the MR pin.
• Low quiescent current consumption for power-sensitive applications.
• Wide operating voltage range allows compatibility with various power supply configurations.

Advantages and Disadvantages

Advantages: - Precise voltage monitoring ensures reliable system operation. - Adjustable reset timeout period allows flexibility in system initialization. - Low-power consumption extends battery life in portable devices. - Compact package size saves board space.

Disadvantages: - Limited threshold voltage options may not cover all application requirements. - Lack of built-in hysteresis may result in potential noise-induced false triggering.

Working Principles

The MAX691CWE+T operates by continuously monitoring the supply voltage using an internal voltage reference. When the voltage falls below the set threshold, the reset output is activated, indicating a power failure or low voltage condition. The reset remains active until the voltage rises above the threshold or a reset timeout period elapses. The reset timeout period can be adjusted using an external capacitor connected to the CT pin.

Detailed Application Field Plans

The MAX691CWE+T finds applications in various fields, including:

1. Microcontroller Systems: Ensures proper system initialization and prevents erratic behavior during power-up or voltage fluctuations.
2. Industrial Control Systems: Provides reliable power-on reset functionality for critical control circuits.
3. Automotive Electronics: Monitors the vehicle's power supply voltage to prevent malfunctions and ensure safe operation.
4. Battery-Powered Devices: Protects sensitive electronics from damage due to low battery voltage and enables graceful shutdown.

Detailed and Complete Alternative Models

1. MAX809: Similar voltage monitor and reset circuit with fixed threshold voltage options.
2. MAX703: Voltage monitor and reset circuit with additional watchdog timer functionality.
3. MAX811: Voltage monitor and reset circuit with manual reset input and adjustable reset timeout period.

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