LTC4318CUF#PBF

Product Overview

Category: Integrated Circuit (IC)

Use: The LTC4318CUF#PBF is a high-speed I2C bus buffer designed to extend the bus capacitance and provide level shifting between two I2C buses operating at different voltage levels. It allows multiple devices with different voltage requirements to communicate seamlessly on the same I2C bus.

Characteristics: - High-Speed Operation: The LTC4318CUF#PBF supports I2C bus speeds up to 400kHz, enabling fast data transfer between devices. - Level Shifting: It provides bidirectional level shifting between two I2C buses operating at different voltage levels, ensuring compatibility between devices with varying voltage requirements. - Low Quiescent Current: The IC has a low quiescent current of only 1.5µA, making it suitable for power-sensitive applications. - Small Package Size: The LTC4318CUF#PBF comes in a compact 16-pin QFN package, allowing for space-efficient integration into electronic systems. - Robust Design: It features built-in ESD protection, ensuring reliable operation in harsh environments.

Package: 16-pin QFN (Quad Flat No-Lead) package.

Essence: The LTC4318CUF#PBF serves as a bridge between two I2C buses with different voltage levels, enabling seamless communication between devices that operate at different voltages.

Packaging/Quantity: The LTC4318CUF#PBF is typically sold in reels or tubes containing 250 units per package.

Specifications

• Supply Voltage Range: 1.6V to 5.5V
• Operating Temperature Range: -40°C to 85°C
• I2C Bus Speed: Up to 400kHz
• Quiescent Current: 1.5µA (typical)
• ESD Protection: ±8kV Human Body Model

Pin Configuration

The LTC4318CUF#PBF features a 16-pin QFN package with the following pin configuration:

```

---

| | --| VCC |-- --| SDA |-- --| SCL |-- --| A0/B0 |-- --| A1/B1 |-- --| A2/B2 |-- --| A3/B3 |-- --| A4/B4 |-- --| A5/B5 |-- --| A6/B6 |-- --| A7/B7 |-- --| GND |-- --| NC |-- --| NC |-- |___________| ```

Functional Features

• Bidirectional Level Shifting: The LTC4318CUF#PBF provides bidirectional level shifting between two I2C buses, allowing devices operating at different voltage levels to communicate seamlessly.
• Automatic Bus Buffering: It automatically buffers the I2C bus signals, extending the bus capacitance and ensuring reliable communication over longer distances.
• Hot Swappable: The IC supports hot swapping, enabling devices to be added or removed from the I2C bus without disrupting the operation of other devices.
• Address Translation: It allows for address translation between the two I2C buses, facilitating communication between devices with different address schemes.

Advantages and Disadvantages

Advantages: - Enables communication between devices with different voltage requirements - Supports high-speed I2C bus operation - Low quiescent current for power-sensitive applications - Compact package size for space-efficient integration - Built-in ESD protection for robustness in harsh environments

Disadvantages: - Requires careful consideration of voltage compatibility between devices

Working Principles

The LTC4318CUF#PBF operates by buffering and level shifting the I2C bus signals between two buses with different voltage levels. It automatically detects the bus conditions and adjusts the voltage levels accordingly, ensuring seamless communication between devices.

When a device on one bus wants to communicate with a device on the other bus, the LTC4318CUF#PBF translates the address and buffers the data, allowing the devices to exchange information without being affected by their voltage differences.

Application Field Plans

The LTC4318CUF#PBF finds applications in various scenarios where multiple devices with different voltage requirements need to communicate over an I2C bus. Some potential application fields include: - Industrial automation systems - Automotive electronics - Consumer electronics - Medical devices - Internet of Things (IoT) devices

Alternative Models

• PCA9306: This IC also provides bidirectional level shifting for I2C buses operating at different voltage levels.
• TCA9517: It is a similar I2C bus buffer with level shifting