MAX691EWE+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 power supply monitoring and reset generation for microcontrollers and other digital systems
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Reset Threshold Voltage Options: 4.63V, 4.38V, 4.00V, 3.08V, 2.93V, 2.63V, 2.32V, 2.06V
• Reset Timeout Period Options: 140ms, 280ms, 560ms, 1120ms
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MAX691EWE+T has a 16-pin wide SOIC package with the following pin configuration:

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

Functional Features

• Monitors the power supply voltage and generates a reset signal when the voltage falls below a specified threshold.
• Provides manual reset capability through the MR pin.
• Offers a choice of reset timeout periods to suit different system requirements.
• Open-drain RESET OUT pin allows for easy interfacing with other devices.

Advantages and Disadvantages

Advantages: - Low-power consumption - Precision voltage monitoring - Wide supply voltage range - Multiple reset threshold and timeout options - Easy integration with microcontrollers and digital systems

Disadvantages: - Limited number of available reset threshold voltage options - Only one manual reset input

Working Principles

The MAX691EWE+T operates by continuously monitoring the power supply voltage using the TH pin. When the voltage drops below the programmed threshold, the circuit generates a reset signal on the RESET pin. The reset signal remains active until the voltage rises above the threshold or a timeout period elapses. The MR pin allows for manual reset control, overriding the automatic reset generation.

Application Field Plans

The MAX691EWE+T is commonly used in various applications where reliable power supply monitoring and reset generation are critical. Some potential application fields include:

1. Microcontroller Systems: Ensures proper initialization and reliable operation of microcontrollers by providing a reset signal during power-up and voltage fluctuations.
2. Industrial Control Systems: Monitors power supply integrity in industrial automation systems, preventing data corruption and ensuring safe operation.
3. Embedded Systems: Protects embedded systems from unpredictable power supply conditions, enhancing overall system reliability.
4. Communication Equipment: Guards against power supply disturbances in networking devices, maintaining uninterrupted communication.
5. Automotive Electronics: Provides voltage monitoring and reset functionality in automotive electronic control units (ECUs), ensuring stable operation.

Alternative Models

• MAX690EPA+: 8-pin DIP package, similar functionality but with fewer pins.
• MAX811TEUS-T: SOT-143 package, offers additional features like watchdog timer and power-fail detection.
• MAX809REUR+: SOT-23 package, lower supply voltage range but with adjustable reset threshold.

(Note: The above alternative models are just a few examples. There are several other alternatives available in the market.)

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