ST490ACN

Product Overview

• Category: Integrated Circuit
• Use: Communication and Networking
• Characteristics: Low-power, High-speed, Robust
• Package: DIP (Dual In-line Package)
• Essence: Transceiver IC for RS-485/RS-422 Applications
• Packaging/Quantity: Tray, 25 pieces per tray

Specifications

• Supply Voltage: 4.75V to 5.25V
• Data Rate: Up to 20 Mbps
• Operating Temperature Range: -40°C to +85°C
• Number of Pins: 8
• Interface: RS-485/RS-422

Detailed Pin Configuration

1. DE (Driver Enable)
2. RE (Receiver Enable)
3. A (Non-Inverting Data Line)
4. B (Inverting Data Line)
5. GND (Ground)
6. Y (Receiver Output)
7. Vcc (Power Supply)
8. Z (Driver Output)

Functional Features

• Supports Half-Duplex Communication
• Built-in Thermal Shutdown Protection
• Receiver Input Impedance: 12 kΩ
• Driver Output Impedance: 54 Ω
• Receiver Output Voltage Swing: ±1.5V
• Driver Output Voltage Swing: ±1.5V

Advantages

• Low Power Consumption
• High-Speed Data Transmission
• Robustness in Noisy Environments
• Wide Operating Temperature Range

Disadvantages

• Limited Number of Pins for Additional Functionality
• Requires External Components for Complete Circuit Implementation

Working Principles

The ST490ACN is a transceiver IC designed for RS-485/RS-422 communication applications. It operates in half-duplex mode, allowing bidirectional data transmission over a single twisted-pair cable. The DE (Driver Enable) and RE (Receiver Enable) pins control the direction of data flow. When DE is high and RE is low, the IC operates in transmit mode, driving data onto the A and B lines. In receive mode, DE is low and RE is high, allowing the IC to receive data from the A and B lines.

The ST490ACN incorporates thermal shutdown protection, which prevents damage due to excessive temperature. It also features a robust receiver input impedance and driver output impedance, ensuring reliable communication even in noisy environments.

Detailed Application Field Plans

The ST490ACN is widely used in various communication and networking applications that require long-distance data transmission with noise immunity. Some common application fields include:

1. Industrial Automation: Used for connecting sensors, actuators, and controllers in industrial automation systems.
2. Building Automation: Enables communication between different building automation devices such as HVAC systems, lighting controls, and security systems.
3. Telecommunications: Facilitates data transmission between network equipment, such as routers, switches, and modems.
4. Automotive Electronics: Used in automotive applications for communication between different electronic control units (ECUs).
5. Renewable Energy Systems: Enables communication between various components in solar power systems, wind turbines, and energy storage systems.

Detailed and Complete Alternative Models

• MAX485
• SN75176
• LTC485
• ADM485
• SP485

These alternative models offer similar functionality and can be used as replacements for the ST490ACN in RS-485/RS-422 communication applications.

In conclusion, the ST490ACN is a versatile transceiver IC designed for reliable data communication in RS-485/RS-422 applications. Its low-power consumption, high-speed data transmission, and robustness make it suitable for various industries. However, it has limitations in terms of pin count and requires external components for complete circuit implementation. Alternative models are available for those seeking different options with similar functionality.