ADM1818-20AKSZ-RL

Product Overview

Category

ADM1818-20AKSZ-RL belongs to the category of voltage supervisors.

Use

This product is primarily used for monitoring and supervising the voltage levels in electronic systems.

Characteristics

• Voltage Range: 2.0V
• Accuracy: ±1.5%
• Low Power Consumption: 10µA (typical)
• Reset Timeout Period: 140ms (typical)
• Operating Temperature Range: -40°C to +85°C
• Package Type: SOT-23
• RoHS Compliant

Package and Quantity

ADM1818-20AKSZ-RL is available in a SOT-23 package. It is typically sold in reels containing 3000 units.

Specifications

• Supply Voltage Range: 1.6V to 5.5V
• Reset Threshold Voltage: 2.0V
• Reset Timeout Period: 140ms (typical)
• Quiescent Current: 10µA (typical)
• Power-On Reset Delay: 20ms (typical)
• Active-Low RESET Output
• Manual Reset Input
• Watchdog Timer
• Open-Drain RESET Output

Pin Configuration

The ADM1818-20AKSZ-RL has the following pin configuration:

```

---

| | --| VDD GND |-- Pin 1: Ground (GND) --| MR RST |-- Pin 2: Manual Reset Input (MR) --| WDI VDD |-- Pin 3: Watchdog Timer Input (WDI) |___________| ```

Functional Features

1. Voltage Monitoring: The ADM1818-20AKSZ-RL continuously monitors the supply voltage and provides a reset signal when it falls below the specified threshold.
2. Manual Reset Input: The manual reset input allows for an external reset signal to be applied, overriding the internal voltage monitoring.
3. Watchdog Timer: The integrated watchdog timer ensures that the system remains operational by periodically resetting it if no activity is detected.
4. Open-Drain RESET Output: The open-drain RESET output provides a low-level signal when a reset condition occurs.

Advantages and Disadvantages

Advantages

• Wide operating voltage range allows for compatibility with various electronic systems.
• Low power consumption minimizes energy usage.
• Small package size enables space-saving designs.
• RoHS compliance ensures environmental friendliness.

Disadvantages

• Limited reset timeout period may not be suitable for certain applications requiring longer delays.
• Lack of adjustable reset threshold voltage may restrict customization options.

Working Principles

The ADM1818-20AKSZ-RL operates by comparing the supply voltage with the preset threshold voltage. When the supply voltage drops below the threshold, the internal circuitry triggers a reset signal. This signal can be used to initiate system recovery or perform other necessary actions. The watchdog timer continuously monitors system activity, preventing lock-ups or malfunctions by resetting the system if no activity is detected within a specific time frame.

Application Field Plans

The ADM1818-20AKSZ-RL finds application in various fields where voltage monitoring and system reliability are crucial. Some potential application areas include:

1. Microcontrollers: Ensuring stable operation and preventing data corruption during power fluctuations.
2. Industrial Control Systems: Monitoring voltage levels to prevent damage to sensitive equipment.
3. Automotive Electronics: Protecting critical components from voltage variations and ensuring reliable performance.
4. Medical Devices: Maintaining proper voltage levels to ensure patient safety and device functionality.

Alternative Models

1. ADM1815-20ARTZ-RL: Similar specifications but with a different package type (SOT-143).
2. ADM1819-20ARTZ-RL: Higher accuracy (±1%) and adjustable reset threshold voltage.
3. ADM1820-20ARTZ-RL: Extended reset timeout period (200ms) for applications requiring longer delays.

These alternative models provide flexibility in choosing the most suitable voltage supervisor based on specific requirements.

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