LM1770TMF/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Supervisor and Reset Generator

Characteristics: - Monitors the power supply voltage and generates a reset signal when the voltage falls below a certain threshold - Provides a stable and reliable reset signal to ensure proper operation of the system - Suitable for use in various electronic devices and systems

Package: Thin Shrink Small Outline Package (TSSOP)

Essence: The LM1770TMF/NOPB is an integrated circuit that performs voltage monitoring and reset generation functions, ensuring the stability and reliability of electronic systems.

Packaging/Quantity: Available in tape and reel packaging with 2500 units per reel.

Specifications

• Supply Voltage Range: 1.6V to 5.5V
• Reset Threshold Voltage Options: 2.93V, 3.08V, 4.63V, or Adjustable
• Reset Timeout Period: 140ms (typical)
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 10µA (typical)

Detailed Pin Configuration

The LM1770TMF/NOPB has the following pin configuration:

1. VCC: Power supply input
2. GND: Ground reference
3. MR: Manual reset input
4. RESET: Reset output
5. TH: Threshold voltage selection pin
6. CT: Capacitor connection for reset timeout adjustment

Functional Features

1. Voltage Monitoring: The LM1770TMF/NOPB continuously monitors the power supply voltage.
2. Reset Generation: When the voltage falls below the set threshold, the IC generates a reset signal.
3. Manual Reset: The manual reset input allows for immediate system reset if required.
4. Adjustable Threshold: The threshold voltage can be set using an external resistor divider network or by selecting one of the predefined options.
5. Reset Timeout: The IC provides a fixed timeout period after which the reset signal is released, ensuring proper system initialization.

Advantages and Disadvantages

Advantages: - Wide supply voltage range allows for use in various applications - Adjustable threshold voltage provides flexibility - Low quiescent current minimizes power consumption - Small package size saves board space

Disadvantages: - Fixed reset timeout period may not be suitable for all applications - Limited number of threshold voltage options

Working Principles

The LM1770TMF/NOPB operates by continuously monitoring the power supply voltage using an internal voltage reference. When the voltage falls below the set threshold, the IC generates a reset signal that can be used to initialize the system. The reset signal remains active until the voltage rises above the threshold or a manual reset is triggered. The reset timeout feature ensures that the system is given sufficient time to stabilize before releasing the reset signal.

Detailed Application Field Plans

The LM1770TMF/NOPB can be used in various electronic devices and systems where voltage monitoring and reliable reset generation are required. Some potential application fields include:

1. Microcontrollers and Microprocessors: Ensuring proper initialization and reliable operation of embedded systems.
2. Communication Systems: Providing stable reset signals for network equipment and communication modules.
3. Industrial Control Systems: Monitoring power supply voltage in control panels and generating resets when necessary.
4. Automotive Electronics: Ensuring proper system startup and operation in automotive applications.

Detailed and Complete Alternative Models

1. MAX809: Voltage supervisor with adjustable reset threshold and timeout options.
2. ADM708: Precision voltage monitor with adjustable threshold and manual reset input.
3. TPS3808: Ultra-low power voltage supervisor with programmable reset threshold and timeout features.

These alternative models offer similar functionality to the LM1770TMF/NOPB and can be considered as alternatives based on specific application requirements.

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