MAX6429FJUR+T

Product Overview

• Category: Integrated Circuit
• Use: Voltage Supervisor
• Characteristics: Low Power, Precision Monitoring, Adjustable Reset Threshold, Manual Reset Input
• Package: SOT-23-6
• Essence: The MAX6429FJUR+T is a voltage supervisor IC that monitors the power supply voltage of a system and generates a reset signal when the voltage falls below a certain threshold.
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Supply Voltage Range: 1.5V to 5.5V
• Reset Threshold Options: Adjustable from 1.2V to 4.63V in 100mV Steps
• Reset Timeout Period: Fixed or Adjustable (from 1ms to 640ms)
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 3µA (typical)

Pin Configuration

The MAX6429FJUR+T has a total of 6 pins arranged as follows:

```

---

| | --| VDD GND |-- Pin 1: Ground (GND) --| MR RST |-- Pin 2: Manual Reset Input (MR) --| RESET VCC |-- Pin 3: Supply Voltage (VCC) --| TH TO |-- Pin 4: Reset Threshold (TH) and Timeout (TO) --| NC NC |-- Pin 5: No Connection (NC) |___________| ```

Functional Features

1. Voltage Monitoring: The MAX6429FJUR+T continuously monitors the supply voltage and asserts a reset signal when it falls below the programmed threshold.
2. Adjustable Reset Threshold: The reset threshold can be adjusted using an external resistor divider network, allowing flexibility in setting the desired voltage level for triggering a reset.
3. Manual Reset Input: The device includes a manual reset input (MR) that can be used to force a reset regardless of the monitored voltage level.
4. Power-On Reset Delay: The MAX6429FJUR+T incorporates a power-on reset delay circuitry to ensure stable operation during power-up.

Advantages and Disadvantages

Advantages: - Low power consumption - Precision monitoring of supply voltage - Adjustable reset threshold - Manual reset input for flexibility - Small package size

Disadvantages: - Limited reset timeout period range - No built-in hysteresis for noise immunity

Working Principles

The MAX6429FJUR+T operates by comparing the supply voltage with the programmed threshold voltage. When the supply voltage drops below the threshold, the reset output is asserted, indicating a power failure or an out-of-tolerance condition. The reset remains active until the supply voltage rises above the threshold and the reset timeout period elapses.

The device also includes a manual reset input (MR), which, when pulled low, forces the reset output to assert, regardless of the monitored voltage level. This feature allows external control over the system reset.

Detailed Application Field Plans

The MAX6429FJUR+T is commonly used in various applications where reliable voltage monitoring and system reset functionality are required. Some potential application fields include:

1. Microcontrollers and Microprocessors: Ensuring proper system initialization and preventing erratic behavior during power fluctuations.
2. Industrial Control Systems: Monitoring critical power supplies and initiating safe shutdown procedures in case of voltage anomalies.
3. Automotive Electronics: Protecting sensitive electronic components from voltage transients and ensuring proper system operation.
4. Battery-Powered Devices: Preventing excessive discharge and preserving battery life by initiating a reset when the voltage drops below a certain level.

Detailed and Complete Alternative Models

1. MAX6428FJUR+T: Similar to the MAX6429FJUR+T but with a fixed reset threshold and timeout period.
2. MAX6430FJUR+T: Voltage supervisor IC with additional features such as adjustable hysteresis and watchdog timer functionality.
3. MAX6389FJUR+T: Low-power voltage supervisor IC with a higher supply voltage range and adjustable reset threshold.

These alternative models offer different combinations of features and specifications, allowing designers to choose the most suitable option for their specific application requirements.

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