MAX641ACSA+T

Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitor and Reset Circuit
• Characteristics: Low-power, precision voltage monitoring, adjustable reset threshold, manual reset input, watchdog timer, power-on reset delay
• Package: 8-pin small outline integrated circuit (SOIC)
• Essence: Provides voltage monitoring and reset functions for microcontrollers and other digital systems
• Packaging/Quantity: Tape and reel packaging, 2500 units per reel

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Reset Threshold Voltage Range: 1.25V to 4.63V (adjustable)
• Manual Reset Input Voltage Range: -0.3V to VCC + 0.3V
• Watchdog Timer Timeout Period: 1.6s (typical)
• Power-On Reset Delay: 150ms (typical)

Pin Configuration

The MAX641ACSA+T has the following pin configuration:

1. GND: Ground
2. MR: Manual Reset Input
3. RESET: Active-Low Reset Output
4. VCC: Supply Voltage
5. TH: Threshold Adjust
6. WDI: Watchdog Timer Input
7. CT: Capacitor Connection for Power-On Reset Delay
8. NC: No Connect

Functional Features

• Voltage Monitoring: Monitors the supply voltage and generates a reset signal when it falls below the programmable threshold.
• Adjustable Reset Threshold: The threshold voltage can be adjusted using an external resistor divider network.
• Manual Reset Input: Allows for manual resetting of the device by asserting a low-level signal on the MR pin.
• Watchdog Timer: Provides a timeout period after which a reset signal is generated if the WDI pin is not toggled.
• Power-On Reset Delay: Delays the generation of the reset signal after power is applied to ensure stable operation.

Advantages

• Low-power consumption
• Precision voltage monitoring
• Adjustable reset threshold for flexibility
• Manual reset input for manual control
• Watchdog timer for system integrity
• Power-on reset delay for stable operation

Disadvantages

• Limited supply voltage range (1.2V to 5.5V)
• Fixed timeout period for watchdog timer
• Requires external components for threshold adjustment and power-on reset delay

Working Principles

The MAX641ACSA+T operates by continuously monitoring the supply voltage using an internal voltage reference and comparator. When the supply voltage falls below the programmable threshold set by the TH pin, the RESET output is asserted low, indicating a reset condition. The threshold voltage can be adjusted using an external resistor divider network connected to the TH pin.

The device also includes a manual reset input (MR) that allows for manual resetting of the system by asserting a low-level signal. This feature is useful during system testing or debugging.

Additionally, the MAX641ACSA+T incorporates a watchdog timer function. The WDI pin must be toggled within a specific timeout period to prevent the generation of a reset signal. If the WDI pin is not toggled within the timeout period, a reset signal is generated.

Furthermore, the device includes a power-on reset delay circuit that ensures stable operation after power is applied. This delay allows the supply voltage to stabilize before generating the reset signal.

Application Field Plans

The MAX641ACSA+T is commonly used in various applications where voltage monitoring and reset functions are required. Some potential application fields include:

1. Microcontroller Systems: Provides reliable reset functionality for microcontrollers to ensure proper initialization and system stability.
2. Embedded Systems: Ensures proper operation of embedded systems by monitoring the supply voltage and initiating a reset if necessary.
3. Industrial Control Systems: Used in industrial control systems to monitor power supply integrity and initiate a reset if voltage falls below the threshold.
4. Automotive Electronics: Provides voltage monitoring and reset capabilities for automotive electronic systems, ensuring proper operation and system recovery.

Alternative Models

1. MAX641BCSA+T: Similar to MAX641ACSA+T but with a different package (8-pin narrow SOIC).
2. MAX642ACSA+T: Voltage monitor and reset circuit with additional features like adjustable watchdog timeout period and active-high reset output.
3. MAX643ACSA+T: Voltage monitor and reset circuit with a wider supply voltage range and higher precision voltage monitoring.

Note: This is not an exhaustive list of alternative models. Please refer to the manufacturer's datasheets for a complete list of available options.

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