DS1811R-10/T&R

Product Overview

Category: Integrated Circuits (ICs)

Use: The DS1811R-10/T&R is a voltage monitor and reset circuit designed to ensure reliable operation of electronic systems. It provides power-on reset generation, watchdog timer, and manual reset input.

Characteristics: - Voltage monitoring range: 2.5V to 5.0V - Reset threshold accuracy: ±10% - Watchdog timeout period: 1.6 seconds - Manual reset input with Schmitt trigger action - Low power consumption: typically 20µA - Small package size: SOT-23-3 - RoHS compliant

Package: The DS1811R-10/T&R is available in a tape and reel packaging, denoted by the "T&R" suffix. This packaging method ensures easy handling and compatibility with automated assembly processes.

Essence: The essence of the DS1811R-10/T&R lies in its ability to monitor the supply voltage and generate a reset signal when the voltage falls below a specified threshold. It also includes a watchdog timer to detect system malfunctions and a manual reset input for user intervention.

Packaging/Quantity: The DS1811R-10/T&R is supplied in a reel containing 3000 units.

Specifications

• Supply Voltage Range: 2.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Reset Threshold Options: 4.63V, 4.38V, 4.00V, 3.08V, 2.93V, 2.63V, 2.31V, 2.06V
• Watchdog Timeout Period: 1.6 seconds
• Manual Reset Input Voltage: -0.3V to VCC + 0.3V
• Quiescent Current: 20µA (typical)

Pin Configuration

The DS1811R-10/T&R is a three-pin device with the following pinout:

____ RESET | | GND |____| VCC

Pin Description: - RESET: Output pin for reset signal - GND: Ground reference - VCC: Supply voltage input

Functional Features

1. Power-On Reset Generation: The DS1811R-10/T&R monitors the supply voltage and generates a reset signal when the voltage falls below the specified threshold. This ensures proper initialization of the system during power-up.

2. Watchdog Timer: The integrated watchdog timer detects system malfunctions by monitoring a periodic signal from the system. If the signal is not received within the specified timeout period, a reset signal is generated to restart the system.

3. Manual Reset Input: The manual reset input allows the user to initiate a system reset manually. It features Schmitt trigger action to ensure reliable operation even in the presence of noisy signals.

Advantages and Disadvantages

Advantages: - Wide operating voltage range allows compatibility with various systems. - Accurate reset threshold ensures reliable reset generation. - Low power consumption minimizes impact on overall system power budget. - Small package size enables space-efficient integration into electronic designs. - RoHS compliance ensures environmental friendliness.

Disadvantages: - Limited number of available reset threshold options may not suit all applications. - Lack of additional advanced features compared to more specialized voltage monitor ICs.

Working Principles

The DS1811R-10/T&R operates by continuously monitoring the supply voltage using an internal voltage comparator. When the voltage falls below the programmed threshold, the reset output is asserted, indicating a power-on reset condition. The watchdog timer monitors the system's periodic signal, and if it fails to receive the signal within the specified timeout period, it triggers a reset. The manual reset input allows the user to manually assert a reset signal.

Application Field Plans

The DS1811R-10/T&R finds applications in various electronic systems where reliable power-on reset generation and watchdog timer functionality are required. Some potential application fields include: - Microcontrollers and microprocessors - Embedded systems - Industrial control systems - Automotive electronics - Consumer electronics

Alternative Models

1. MAX811R: Similar voltage monitor and reset circuit with additional features such as adjustable reset threshold and push-pull output.
2. ADM6315: Voltage monitor and reset circuit with adjustable reset threshold and watchdog timer.
3. TPS3808: Ultra-low-power voltage monitor and reset circuit with programmable reset threshold and watchdog timer.

These alternative models offer similar functionality but may have different specifications and package options. It is recommended to review their datasheets for detailed information.

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