LTC1686IS8#PBF

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Supervisor
• Characteristics: Low Power, Precision Monitoring, Adjustable Thresholds
• Package: 8-Lead SOIC (Small Outline Integrated Circuit)
• Essence: Monitors the voltage level of a power supply and provides a reset signal when the voltage falls below a certain threshold.
• Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.6V to 5.5V
• Reset Threshold Voltage Options: 2.5V, 3.0V, 3.3V, 5.0V
• Reset Timeout Period: 200ms, 400ms, 800ms, or 1.6s
• Quiescent Current: 10µA (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

1. GND: Ground connection
2. RESET: Output reset signal
3. VCC: Positive power supply
4. MR: Manual reset input
5. TH: Threshold voltage selection pin
6. TR: Reset timeout period selection pin
7. NC: No connection
8. VCC: Positive power supply

Functional Features

• Monitors the voltage level of a power supply and generates a reset signal when the voltage drops below the selected threshold.
• Provides adjustable threshold voltage options to suit different applications.
• Offers various reset timeout periods to accommodate different system requirements.
• Includes a manual reset input for external reset control.
• Low quiescent current consumption ensures minimal power usage.

Advantages and Disadvantages

Advantages

• Wide supply voltage range allows compatibility with various power sources.
• Adjustable threshold voltage options provide flexibility in voltage monitoring.
• Multiple reset timeout periods cater to different system response times.
• Low power consumption helps conserve energy in battery-powered applications.

Disadvantages

• Limited number of threshold voltage and reset timeout period options.
• Manual reset input may require additional external components for proper functionality.

Working Principles

The LTC1686IS8#PBF operates by continuously monitoring the voltage level of the power supply connected to its VCC pin. When the voltage falls below the selected threshold, the RESET pin is asserted low, indicating a reset condition. The threshold voltage can be adjusted using the TH pin, allowing customization for specific voltage requirements.

The reset timeout period, determined by the TR pin, controls how long the RESET pin remains low after the voltage rises above the threshold. This feature prevents false resets caused by temporary voltage fluctuations. Additionally, the MR pin allows an external manual reset signal to override the internal monitoring circuitry.

Detailed Application Field Plans

The LTC1686IS8#PBF finds application in various electronic systems where reliable voltage monitoring is crucial. Some potential fields of use include:

1. Power Supply Monitoring: Ensuring stable operation of microcontrollers, DSPs, and other digital devices by providing a reset signal when the power supply voltage drops below a specified level.
2. Battery-Powered Systems: Protecting sensitive electronics from damage due to low battery voltage by initiating a reset or shutdown sequence.
3. Industrial Control Systems: Monitoring power supply integrity in PLCs, motor control units, and other industrial equipment to prevent malfunctions and ensure safe operation.
4. Automotive Electronics: Safeguarding critical automotive systems, such as engine control units (ECUs) and safety modules, against voltage dips or spikes that could lead to system failures.
5. Telecommunications Equipment: Maintaining uninterrupted operation of network infrastructure components, such as routers and switches, by detecting power supply anomalies and triggering appropriate actions.

Detailed and Complete Alternative Models

1. LTC1686CS8#PBF: Similar to LTC1686IS8#PBF, but in an 8-Lead Plastic Small Outline (SO) package.
2. LTC1686HS8#PBF: Higher temperature range variant (-40°C to +125°C) of LTC1686IS8#PBF.
3. LTC1686IMS8#PBF: Micro SMD (Surface Mount Device) version of LTC1686IS8#PBF with a smaller footprint.

These alternative models offer similar functionality and characteristics, allowing users to choose the most suitable option based on their specific requirements.

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