PCA9518PWR

Product Overview

Category: Integrated Circuit (IC)

Use: Level shifting and translating between different voltage levels in I2C bus applications.

Characteristics: - Bidirectional voltage level translation - Supports I2C Fast Mode Plus (Fm+) with speeds up to 1 MHz - Compatible with both 3.3V and 5V systems - Low standby current consumption - ESD protection for robust operation

Package: TSSOP-8

Essence: The PCA9518PWR is a level translator IC designed specifically for I2C bus applications, allowing communication between devices operating at different voltage levels.

Packaging/Quantity: The PCA9518PWR is available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Standby Current: 10µA (typical)
• Rise/Fall Time: 20ns (maximum)
• Output Capacitance: 10pF (typical)

Pin Configuration

The PCA9518PWR has a total of 8 pins arranged as follows:

```

---

| | --| VCC GND |-- Pin 1: Ground (GND) --| SDA SCL |-- Pin 2: Serial Data (SDA) --| OE A0 |-- Pin 3: Output Enable (OE) --| A1 A2 |-- Pins 4 and 5: Address Inputs (A0, A1) |___________| ```

Functional Features

• Bidirectional voltage level translation between two I2C buses operating at different voltages.
• Automatic direction sensing and control.
• Supports multiple devices on the same I2C bus.
• Provides ESD protection for reliable operation.

Advantages and Disadvantages

Advantages: - Enables communication between devices operating at different voltage levels. - Supports high-speed data transfer up to 1 MHz. - Low standby current consumption. - Compact TSSOP-8 package for space-constrained applications.

Disadvantages: - Limited to level shifting within the voltage range of 2.3V to 5.5V. - Requires external pull-up resistors for proper I2C bus operation.

Working Principles

The PCA9518PWR utilizes a bidirectional voltage level translation technique to enable communication between two I2C buses operating at different voltage levels. It automatically senses the direction of data flow and adjusts the voltage levels accordingly. The device also provides ESD protection to ensure reliable operation in harsh environments.

Detailed Application Field Plans

The PCA9518PWR is commonly used in various applications where level shifting between different voltage domains is required in I2C bus communication. Some typical application fields include:

1. Embedded Systems: Used in microcontroller-based systems to interface with peripheral devices operating at different voltage levels.
2. Industrial Automation: Enables communication between sensors, actuators, and control units operating at different voltage levels.
3. Consumer Electronics: Facilitates interconnection between devices such as smartphones, tablets, and displays with varying voltage requirements.
4. Automotive Electronics: Allows communication between different modules and subsystems in automotive applications, ensuring compatibility between various voltage levels.

Detailed and Complete Alternative Models

1. PCA9306: Similar bidirectional I2C bus voltage level translator with automatic direction sensing. Supports voltage translation between 1.2V and 3.3V.
2. TXB0108: Eight-channel bi-directional voltage-level translator with automatic direction sensing. Supports voltage translation between 1.2V and 3.6V.
3. SN74LVC8T245: Eight-bit dual-supply bus transceiver with configurable voltage level translation. Supports voltage translation between 1.2V and 5.5V.

These alternative models offer similar functionality to the PCA9518PWR and can be considered based on specific application requirements.

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