DS1705EUA+T&R

Product Overview

• Category: Integrated Circuit
• Use: Voltage Supervisor
• Characteristics: Low-power, Precision, Programmable
• Package: SOT-23-8
• Essence: Monolithic CMOS Microcontroller Reset Circuit
• Packaging/Quantity: Tape and Reel (3000 units per reel)

Specifications

• Supply Voltage Range: 1.2V to 5.5V
• Reset Threshold Voltage Options: 2.63V, 3.08V, 4.38V, or Adjustable
• Reset Timeout Period Options: 140ms, 450ms, 900ms, or Adjustable
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 10µA (typical)
• Power-On Reset Delay: 20ms (typical)
• Manual Reset Input: Active-Low
• Watchdog Timer: Programmable

Detailed Pin Configuration

The DS1705EUA+T&R has the following pin configuration:

1. GND: Ground
2. MR: Manual Reset Input
3. VCC: Supply Voltage
4. RESET: Active-Low Reset Output
5. WDI: Watchdog Timer Input
6. ADJ: Reset Threshold Adjustment
7. TO: Reset Timeout Selection
8. NC: No Connection

Functional Features

• Monitors supply voltage and asserts reset when it falls below the programmed threshold.
• Provides a manual reset input for immediate system reset.
• Offers a watchdog timer input for monitoring system activity.
• Allows adjustment of reset threshold voltage and timeout period.
• Low quiescent current consumption for power-sensitive applications.

Advantages and Disadvantages

Advantages: - Wide supply voltage range allows compatibility with various systems. - Programmable options provide flexibility in meeting specific requirements. - Low-power consumption prolongs battery life in portable devices. - Small package size enables space-saving designs.

Disadvantages: - Limited number of reset threshold voltage and timeout period options. - Lack of built-in hysteresis may result in potential noise-related issues.

Working Principles

The DS1705EUA+T&R is a voltage supervisor integrated circuit designed to monitor the supply voltage of a microcontroller or other digital systems. It continuously compares the supply voltage with the programmed threshold voltage. When the supply voltage falls below the threshold, the reset output is asserted, indicating that the system should be reset.

The device also includes a manual reset input, which allows an external signal to immediately assert the reset output, regardless of the supply voltage level. This feature is useful for system debugging or recovery purposes.

Furthermore, the DS1705EUA+T&R incorporates a watchdog timer input, which monitors the activity of the system. If the watchdog timer input is not toggled within the programmed timeout period, the reset output is asserted, initiating a system reset.

Detailed Application Field Plans

The DS1705EUA+T&R is commonly used in various applications where reliable voltage monitoring and system reset functionality are required. Some typical application fields include:

1. Microcontrollers and Microprocessors: Ensuring proper system initialization and preventing erratic behavior during power-up or brownout conditions.
2. Embedded Systems: Providing robust reset functionality to maintain system integrity and prevent software lock-ups.
3. Industrial Control Systems: Monitoring critical voltages in control units to ensure safe operation and prevent damage to equipment.
4. Automotive Electronics: Resetting microcontrollers in automotive applications to recover from fault conditions and maintain system reliability.
5. Power Management: Enabling efficient power management by initiating system resets when the supply voltage drops below a specified threshold.

Detailed and Complete Alternative Models

1. MAX809: Voltage Supervisors with Adjustable Threshold and Timeout Periods.
2. LTC2937: Precision Triple Supply Monitor with Adjustable Thresholds and Reset Delay.
3. ADM6315: Microprocessor Supervisory Circuit with Adjustable Reset Threshold and Timeout.
4. TPS3839: Ultra-Low Quiescent Current Voltage Supervisor with Programmable Options.

These alternative models offer similar functionality to the DS1705EUA+T&R and can be considered as alternatives based on specific application requirements.

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