MAX490ECPA+ - English Editing Encyclopedia Entry

Product Overview

Category: Integrated Circuits (ICs)

Use: The MAX490ECPA+ is a high-speed, low-power RS-485/RS-422 transceiver. It is designed to provide reliable half-duplex communication in industrial and automotive applications.

Characteristics: - High-Speed Communication: The MAX490ECPA+ supports data rates up to 2.5Mbps, making it suitable for applications requiring fast and efficient data transmission. - Low Power Consumption: This transceiver operates at a low supply current of 300µA, making it ideal for battery-powered devices or energy-efficient systems. - Robust Design: With built-in protection features such as short-circuit and overvoltage protection, the MAX490ECPA+ ensures reliable operation even in harsh environments. - Wide Supply Voltage Range: It can operate from a single +5V supply or dual ±5V supplies, providing flexibility in various system configurations.

Package: The MAX490ECPA+ is available in an 8-pin PDIP (Plastic Dual In-Line Package) or SOIC (Small Outline Integrated Circuit) package.

Essence: The MAX490ECPA+ is a versatile RS-485/RS-422 transceiver that enables robust and high-speed communication in industrial and automotive applications.

Packaging/Quantity: The MAX490ECPA+ is typically sold in reels or tubes containing multiple units, with the exact quantity depending on the supplier.

Specifications

• Supply Voltage Range: +4.5V to +5.5V
• Operating Temperature Range: -40°C to +85°C
• Data Rate: Up to 2.5Mbps
• Number of Channels: 1 (Half-Duplex)
• Input/Output Logic Levels: CMOS/TTL Compatible
• ESD Protection: ±15kV (Human Body Model)
• Package Type: 8-Pin PDIP or SOIC

Pin Configuration

The MAX490ECPA+ features an 8-pin package with the following pin configuration:

Pin 1: DE (Driver Output Enable) Pin 2: A (Non-Inverting Driver Input/Receiver Output) Pin 3: B (Inverting Driver Input/Receiver Output) Pin 4: GND (Ground) Pin 5: Y (Receiver Output) Pin 6: Z (Receiver Output) Pin 7: VCC (Supply Voltage) Pin 8: RE (Receiver Output Enable)

Functional Features

• Driver Output Enable (DE): This input pin enables or disables the driver output stage.
• Non-Inverting Driver Input/Receiver Output (A): This pin is used for transmitting data in RS-485 mode and receiving data in RS-422 mode.
• Inverting Driver Input/Receiver Output (B): This pin is used for transmitting inverted data in RS-485 mode and receiving data in RS-422 mode.
• Ground (GND): This pin is connected to the ground reference of the system.
• Receiver Output (Y, Z): These pins provide the received data outputs in RS-485 and RS-422 modes, respectively.
• Supply Voltage (VCC): This pin is connected to the positive supply voltage.
• Receiver Output Enable (RE): This input pin enables or disables the receiver output stage.

Advantages and Disadvantages

Advantages: - High-speed communication capability allows for efficient data transmission. - Low power consumption makes it suitable for battery-powered devices. - Robust design with built-in protection features ensures reliable operation in harsh environments. - Wide supply voltage range provides flexibility in system configurations.

Disadvantages: - Limited to half-duplex communication, not suitable for full-duplex applications. - Requires external components for proper operation, increasing system complexity.

Working Principles

The MAX490ECPA+ is designed to facilitate reliable data transmission over long distances using the RS-485/RS-422 standard. It employs differential signaling to minimize noise susceptibility and improve signal integrity. The transceiver uses a driver stage to transmit data and a receiver stage to receive data.

When transmitting, the driver input pins (A and B) receive the data to be transmitted. The DE pin controls the driver output stage, enabling or disabling the transmission. The transceiver converts the logic-level signals into differential voltage signals on the transmission line.

During reception, the transceiver receives the differential voltage signals from the transmission line through the receiver input pins (A and B). The received signals are then converted back into logic-level signals at the receiver output pins (Y and Z).

Detailed Application Field Plans

The MAX490ECPA+ finds application in various industrial and automotive scenarios, including but not limited to: - Industrial Automation