MAX691CPE+ - English Editing Encyclopedia Entry

Product Overview

Category: Integrated Circuit (IC)

Use: The MAX691CPE+ is a versatile integrated circuit primarily used for power supply monitoring and reset functions in electronic systems.

Characteristics: - Monitors the power supply voltage to ensure it remains within specified limits. - Generates a reset signal when the power supply voltage falls below a predetermined threshold. - Provides a delay time to allow the power supply voltage to stabilize before releasing the reset signal. - Offers flexibility in configuring the reset threshold voltage and delay time through external components.

Package: The MAX691CPE+ is available in an 8-pin plastic DIP (Dual Inline Package) with a narrow body, making it suitable for space-constrained applications.

Essence: The essence of the MAX691CPE+ lies in its ability to monitor and control the power supply voltage, ensuring reliable operation of electronic systems.

Packaging/Quantity: The MAX691CPE+ is typically packaged in tubes or reels, with a quantity of 25 units per tube/reel.

Specifications

• Supply Voltage Range: 3V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Reset Threshold Voltage Accuracy: ±1.5%
• Reset Timeout Period: Adjustable from 1ms to 640ms
• Quiescent Current: 50µA (typical)
• Output Drive Capability: 10mA (sink/source)

Pin Configuration

The MAX691CPE+ features the following pin configuration:

| Pin Number | Pin Name | Description | |------------|----------|-------------| | 1 | GND | Ground | | 2 | RESET | Reset Output| | 3 | VCC | Power Supply| | 4 | MR | Manual Reset| | 5 | TH | Threshold | | 6 | CT | Capacitor | | 7 | DIS | Disable | | 8 | VBAT | Battery Input|

Functional Features

1. Power Supply Monitoring: The MAX691CPE+ continuously monitors the power supply voltage to ensure it remains within the desired range.
2. Reset Signal Generation: When the power supply voltage falls below the preset threshold, the MAX691CPE+ generates a reset signal to initiate system reset or shutdown.
3. Adjustable Delay Time: The integrated circuit provides an adjustable delay time to allow the power supply voltage to stabilize before releasing the reset signal.
4. Manual Reset Capability: The MR pin allows for manual reset initiation, overriding the automatic reset function.
5. Disable Function: The DIS pin can be used to disable the reset output temporarily, useful during system testing or maintenance.

Advantages and Disadvantages

Advantages: - Reliable Power Supply Monitoring: Ensures stable operation of electronic systems by monitoring the power supply voltage. - Adjustable Parameters: Allows customization of reset threshold voltage and delay time to suit specific application requirements. - Manual Reset Capability: Provides flexibility in initiating system resets manually. - Compact Package: The narrow body 8-pin DIP package is suitable for space-constrained applications.

Disadvantages: - Limited Output Drive Capability: The MAX691CPE+ has a maximum output drive capability of 10mA, which may not be sufficient for certain high-current applications. - Single Battery Input: The IC supports only a single battery input, limiting its use in systems requiring multiple power sources.

Working Principles

The MAX691CPE+ operates by continuously monitoring the power supply voltage through the TH pin. If the voltage falls below the preset threshold, the internal circuitry triggers a reset signal on the RESET pin. The delay time, determined by an external capacitor connected to the CT pin, allows the power supply voltage to stabilize before releasing the reset signal. The MR pin provides a manual reset option, overriding the automatic reset function.

Application Field Plans

The MAX691CPE+ finds applications in various electronic systems where reliable power supply monitoring and reset functions are critical. Some potential application fields include:

1. Microcontroller Systems: Ensures stable operation of microcontroller-based systems by monitoring the power supply voltage and initiating resets when necessary.
2. Embedded Systems: Provides reliable power supply monitoring and reset capabilities for embedded systems, preventing erratic behavior due to voltage fluctuations.
3. Industrial Control Systems: Enables continuous monitoring of power supply voltage in industrial control systems, ensuring uninterrupted operation and preventing damage to sensitive equipment.
4. Automotive Electronics: Used in automotive electronics to monitor the vehicle's power supply voltage and initiate system resets if voltage drops below acceptable levels.
5. Telecommunications Equipment: Ensures reliable operation of telecommunications equipment by monitoring power supply voltage and initiating resets to prevent system failures.

Alternative Models

1. MAX691A: