MAX813LCSA

Product 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, small package size
• Package: 8-pin SOIC (Small Outline Integrated Circuit)
• Essence: MAX813LCSA is a voltage monitor and reset circuit designed to monitor the power supply voltage of electronic systems and provide a reset signal when the voltage falls below a certain threshold.
• Packaging/Quantity: The MAX813LCSA is available in tape and reel packaging with a quantity of 2500 units per reel.

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Reset Threshold Voltage Range: Adjustable from 1.25V to 4.63V
• Reset Timeout Period: 140ms (typical)
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 3µA (typical)

Pin Configuration

The MAX813LCSA has the following pin configuration:

```

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| | --| RESET |-- --| THRESHOLD |-- --| GND |-- --| MR |-- --| VCC |-- --| WDI |-- --| RESET |-- |___________| ```

• RESET: Output reset signal
• THRESHOLD: Input for setting the reset threshold voltage
• GND: Ground reference
• MR: Manual reset input
• VCC: Power supply voltage input
• WDI: Watchdog input
• RESET: Output reset signal

Functional Features

• Monitors the power supply voltage and generates a reset signal when the voltage falls below the set threshold.
• The reset threshold voltage can be adjusted using an external resistor divider network connected to the THRESHOLD pin.
• Provides a manual reset input (MR) for immediate system reset.
• Includes a watchdog timer input (WDI) for monitoring system activity and generating a reset if no activity is detected within a specified timeout period.
• Low quiescent current consumption makes it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Precise voltage monitoring ensures reliable system operation. - Adjustable reset threshold allows flexibility in setting the desired voltage level for triggering a reset. - Small package size saves board space. - Low-power consumption extends battery life in portable devices.

Disadvantages: - Limited number of pins may restrict the number of additional features that can be integrated into the circuit. - Not suitable for high-voltage applications due to the maximum supply voltage limitation.

Working Principles

The MAX813LCSA continuously monitors the power supply voltage by comparing it with the internally set threshold voltage. When the supply voltage drops below the threshold, the RESET output is asserted, indicating a low-voltage condition. The reset signal remains active until the supply voltage rises above the threshold again.

The reset threshold voltage can be adjusted by connecting an external resistor divider network to the THRESHOLD pin. This allows customization of the threshold voltage according to the specific requirements of the system.

In addition to voltage monitoring, the MAX813LCSA includes a manual reset input (MR) that can be used to force an immediate system reset. It also features a watchdog timer input (WDI) for monitoring system activity. If no activity is detected within the specified timeout period, the MAX813LCSA generates a reset signal.

Detailed Application Field Plans

The MAX813LCSA is widely used in various electronic systems where reliable voltage monitoring and reset functionality are required. Some of the application fields include:

1. Microcontrollers and microprocessors
2. Embedded systems
3. Industrial control systems
4. Power management circuits
5. Battery-powered devices
6. Automotive electronics
7. Communication equipment

Detailed and Complete Alternative Models

• MAX813LCSA+: Similar to MAX813LCSA, but with extended operating temperature range (-40°C to +125°C).
• MAX813LCUA: 10-pin µMAX package variant of MAX813LCSA.
• MAX813LESA: 16-pin QSOP (Quarter Small Outline Package) variant of MAX813LCSA.

These alternative models offer similar functionality and features as the MAX813LCSA but may have different package options or extended temperature ranges to suit specific application requirements.

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