MAX3485ESA+T

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: RS-485/RS-422 Transceiver
• Characteristics:
  • High-Speed Data Transmission
  • Low Power Consumption
  • ESD Protection
  • Half-Duplex Communication
• Package: SOIC-8
• Essence: MAX3485ESA+T is a high-speed transceiver IC used for RS-485 and RS-422 communication protocols.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: +3.0V to +5.5V
• Data Rate: Up to 2.5Mbps
• Operating Temperature Range: -40°C to +85°C
• Number of Channels: 1
• Receiver Input Impedance: 12kΩ
• Driver Output Impedance: 96Ω

Detailed Pin Configuration

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

Functional Features

• Robust ESD Protection: Provides ±15kV Human Body Model (HBM) ESD protection on the bus pins.
• Low Power Consumption: Consumes only 300µA of supply current during shutdown mode.
• High-Speed Data Transmission: Supports data rates up to 2.5Mbps, enabling fast and reliable communication.
• Half-Duplex Communication: Allows bidirectional communication on a single pair of wires.

Advantages

• Wide Supply Voltage Range: Can operate with a supply voltage ranging from +3.0V to +5.5V, providing flexibility in various applications.
• ESD Protection: Offers robust protection against electrostatic discharge, ensuring the reliability of the communication system.
• Low Power Consumption: Helps conserve power in battery-operated devices and reduces overall energy consumption.

Disadvantages

• Single Channel: Limited to one channel, which may not be suitable for applications requiring multiple independent communication channels.
• Half-Duplex Communication: Supports only half-duplex communication, which means data can be transmitted or received but not simultaneously.

Working Principles

The MAX3485ESA+T is designed to facilitate reliable data transmission over long distances using RS-485 and RS-422 protocols. It employs differential signaling to minimize noise interference and improve signal integrity. The driver section converts logic-level signals into differential voltages, while the receiver section converts differential voltages back into logic-level signals. The DE and RE pins control the direction of data flow, enabling half-duplex communication.

Detailed Application Field Plans

The MAX3485ESA+T is widely used in various industrial automation systems, building automation, instrumentation, and other applications that require long-distance data transmission with noise immunity. Some specific application areas include: - Industrial Control Systems - HVAC (Heating, Ventilation, and Air Conditioning) Systems - Access Control Systems - Security Systems - Data Acquisition Systems

Detailed and Complete Alternative Models

• MAX3483E: 3.3V-Powered, ±15kV ESD-Protected, 10Mbps, True RS-485/RS-422 Transceiver
• MAX485: Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

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