MAX490EESA

Product Overview

• Category: Integrated Circuit (IC)
• Use: RS-485/RS-422 Transceiver
• Characteristics: Low-power, high-speed, half-duplex communication
• Package: 8-pin SOIC (Small Outline Integrated Circuit)
• Essence: Transmits and receives data over long distances using differential signaling
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: +4.5V to +5.5V
• Data Rate: Up to 2.5 Mbps
• Operating Temperature Range: -40°C to +85°C
• Number of Drivers/Receivers: 1 Driver, 1 Receiver
• Differential Output Voltage: ±1.5V (minimum)
• ESD Protection: ±15kV (Human Body Model)

Pin Configuration

The MAX490EESA has the following pin configuration:

```

---

| | --| Vcc GND |-- Pin 1: Power Supply --| RO RE |-- Pin 2: Receiver Output --| RI DE |-- Pin 3: Receiver Input / Driver Enable --| DI D |-- Pin 4: Driver Input --| DE A |-- Pin 5: Driver Enable --| RE B |-- Pin 6: Receiver Enable --| A Y |-- Pin 7: Driver Output --| B Z |-- Pin 8: Driver Output |___________| ```

Functional Features

• Supports RS-485 and RS-422 standards
• Allows half-duplex communication
• Provides thermal shutdown protection
• Features low quiescent current for power efficiency
• Offers short-circuit protection on driver outputs

Advantages and Disadvantages

Advantages: - High-speed data transmission - Low power consumption - Wide operating temperature range - ESD protection for robustness

Disadvantages: - Limited to half-duplex communication - Requires external components for complete functionality

Working Principles

The MAX490EESA is a transceiver IC designed for RS-485 and RS-422 communication. It uses differential signaling to transmit and receive data over long distances. The driver section converts the logic-level input signals into differential voltages, while the receiver section converts the differential voltages back into logic-level signals. This allows reliable data transfer in noisy environments.

Detailed Application Field Plans

The MAX490EESA is commonly used in various applications, including:

1. Industrial Automation: Used for communication between PLCs (Programmable Logic Controllers), sensors, and actuators in industrial control systems.
2. Building Automation: Enables communication between HVAC (Heating, Ventilation, and Air Conditioning) systems, lighting controls, and security systems.
3. Telecommunications: Facilitates data transmission in telecommunication networks, such as connecting modems, routers, and switches.
4. Automotive: Used in automotive electronics for communication between different vehicle subsystems, such as engine control units and body control modules.

Detailed and Complete Alternative Models

Some alternative models to the MAX490EESA include:

1. SN75176 - RS-485 Transceiver by Texas Instruments
2. LTC1480 - Low Power RS-485 Transceiver by Linear Technology
3. ADM485 - Half-Duplex RS-485 Transceiver by Analog Devices
4. SP3485 - Full-Duplex RS-485 Transceiver by Exar Corporation

These alternatives offer similar functionality and can be considered based on specific application requirements.

In conclusion, the MAX490EESA is a versatile RS-485/RS-422 transceiver IC with high-speed communication capabilities, low power consumption, and robustness. It finds applications in various industries and can be replaced by alternative models depending on specific needs.