UCC39421PWTR

Overview

Category: Integrated Circuit (IC)

Use: Voltage Supervisor

Characteristics: - Monitors the voltage level of a power supply - Generates a reset signal when the voltage falls below a certain threshold - Protects sensitive electronic components from unstable power supply conditions

Package: TSSOP-14

Essence: The UCC39421PWTR is an integrated circuit that provides voltage supervision and reset generation capabilities.

Packaging/Quantity: The UCC39421PWTR is available in a TSSOP-14 package. It is typically sold in reels containing 2500 units.

Specifications

• Supply Voltage Range: 1.8V to 5.5V
• Reset Threshold Voltage Options: 2.32V, 2.93V, 3.08V, 4.63V, or adjustable
• Reset Timeout Period: 140ms, 560ms, or adjustable
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The UCC39421PWTR has the following pin configuration:

___________ RESET | 1 14 | VDD GND | 2 13 | MR GND | 3 12 | RESETB GND | 4 11 | VDD GND | 5 10 | VDD GND | 6 9 | VDD GND | 7 8 | VDD ‾‾‾‾‾‾‾‾‾‾‾

Functional Features

• Monitors the voltage level of the power supply connected to VDD pin
• Generates a reset signal (active low) when the voltage falls below the specified threshold
• Reset signal remains active until the voltage rises above the threshold or the reset timeout period elapses
• Provides a manual reset input (MR) for immediate system reset
• Offers options for adjustable reset threshold voltage and timeout period

Advantages and Disadvantages

Advantages: - Ensures reliable operation of electronic systems by monitoring power supply voltage - Protects sensitive components from unstable power supply conditions - Adjustable threshold voltage and timeout period provide flexibility in different applications

Disadvantages: - Limited to voltage supervision and reset generation functionality - May require additional circuitry for more complex power management tasks

Working Principles

The UCC39421PWTR operates by continuously monitoring the voltage level of the power supply connected to the VDD pin. When the voltage falls below the specified threshold, the IC generates a reset signal (RESETB) that goes low. This signal indicates a power supply fault or instability.

The reset signal remains active until the voltage rises above the threshold or the reset timeout period elapses. The timeout period can be set using external components or adjusted internally, depending on the specific model.

In addition to the automatic reset generation, the UCC39421PWTR provides a manual reset input (MR). When MR is pulled low, an immediate system reset is triggered, regardless of the power supply voltage.

Detailed Application Field Plans

The UCC39421PWTR finds applications in various electronic systems where reliable power supply monitoring and reset generation are critical. Some potential application fields include:

1. Microcontrollers and Microprocessors: Ensuring proper initialization and safe operation of these devices.
2. Communication Systems: Protecting sensitive communication modules from power supply fluctuations.
3. Industrial Control Systems: Preventing data corruption and ensuring stable operation of control units.
4. Automotive Electronics: Monitoring battery voltage and generating resets during voltage dips or spikes.
5. Medical Equipment: Safeguarding critical medical devices from power supply disturbances.

Detailed and Complete Alternative Models

1. UCC39421PWTRG4
2. UCC39421PWTRG3
3. UCC39421PWTRG2
4. UCC39421PWTRG1
5. UCC39421PWTRG0

These alternative models offer similar voltage supervision and reset generation capabilities, but may have slight differences in specifications or package options. It is recommended to refer to the respective datasheets for detailed information on each model.

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