MAX1489ECPD+ - English Editing Encyclopedia Entry

Product Overview

Category: Integrated Circuit (IC)

Use: The MAX1489ECPD+ is a versatile RS-485/RS-422 transceiver designed for high-speed communication over long distances. It provides reliable data transmission in industrial and commercial applications.

Characteristics: - Supports half-duplex communication - Operates at data rates up to 2.5 Mbps - Wide common-mode voltage range (-7V to +12V) - Low power consumption - Robust ESD protection - Thermal shutdown protection

Package: The MAX1489ECPD+ is available in a 14-pin plastic dual in-line package (PDIP).

Essence: This IC serves as an interface between a microcontroller or other digital device and an RS-485/RS-422 network, enabling bidirectional data transfer with noise immunity and long-distance capabilities.

Packaging/Quantity: The MAX1489ECPD+ is typically sold in reels or tubes, with 25 units per reel/tube.

Specifications

• Supply Voltage: +4.75V to +5.25V
• Operating Temperature Range: -40°C to +85°C
• Data Rate: Up to 2.5 Mbps
• Receiver Input Impedance: 12 kΩ
• Driver Output Impedance: 96 Ω
• Maximum Driver Output Voltage: ±10V
• Maximum Receiver Input Voltage: ±12V

Pin Configuration

The MAX1489ECPD+ features the following pin configuration:

1. DE (Driver Enable)
2. /RE (Receiver Enable)
3. A (Non-Inverting Driver Output / Receiver Input)
4. B (Inverting Driver Output / Receiver Input)
5. GND (Ground)
6. Y (Receiver Output)
7. Z (Receiver Output)
8. VCC (Supply Voltage)
9. RO (Receiver Output)
10. /RE (Receiver Enable)
11. DE (Driver Enable)
12. B (Inverting Driver Output / Receiver Input)
13. A (Non-Inverting Driver Output / Receiver Input)
14. GND (Ground)

Functional Features

• Half-Duplex Communication: The MAX1489ECPD+ supports bidirectional data transfer, allowing both transmission and reception on a single communication line.
• Wide Common-Mode Voltage Range: It can operate in environments with varying ground potentials, thanks to its wide common-mode voltage range of -7V to +12V.
• ESD Protection: The IC incorporates robust electrostatic discharge (ESD) protection, safeguarding the transceiver from damage caused by static electricity.
• Thermal Shutdown Protection: In case of excessive temperature rise, the device automatically shuts down to prevent overheating and potential damage.

Advantages and Disadvantages

Advantages: - High-speed data transmission up to 2.5 Mbps - Wide common-mode voltage range for versatile applications - Low power consumption - Reliable performance in industrial environments - ESD protection ensures durability

Disadvantages: - Limited to half-duplex communication - Requires external components for complete RS-485/RS-422 network implementation

Working Principles

The MAX1489ECPD+ operates as an interface between a microcontroller or digital device and an RS-485/RS-422 network. It converts the digital signals from the microcontroller into differential voltage signals suitable for long-distance transmission. The transceiver employs differential signaling to minimize noise interference and maximize data integrity.

When transmitting, the driver section of the IC amplifies the digital signals and outputs them differentially through pins A and B. On the receiving end, the receiver section converts the differential signals back into digital data and outputs it through pins Y and Z.

Detailed Application Field Plans

The MAX1489ECPD+ finds applications in various fields, including: 1. Industrial Automation: It enables reliable communication between PLCs (Programmable Logic Controllers), sensors, and actuators in industrial automation systems. 2. Building Automation: The transceiver facilitates data exchange between control panels, HVAC systems, lighting controls, and other building automation devices. 3. Instrumentation: It is used in data acquisition systems, test equipment, and measurement devices to transmit data over long distances with noise immunity. 4. Telecommunications: The IC is employed in telecom infrastructure equipment for long-distance data transmission between network nodes. 5. Automotive Electronics: It enables communication between different electronic modules within a vehicle, such as engine control units, body control modules, and infotainment systems.

Detailed and Complete Alternative Models

1. SN75176B - RS-485 Transceiver
2. LTC485 - Low Power RS-485 Transceiver
3. ADM2483 - Isolated RS-485 Transceiver