MAX4903ETA+T

Product Overview

• Category: Integrated Circuits (ICs)
• Use: RS-485/RS-422 Transceiver
• Characteristics: High-speed, low-power, half-duplex transceiver
• Package: 8-pin TDFN (Thin Dual Flat No-Lead) package
• Essence: Provides a robust interface between microcontrollers or other digital logic systems and RS-485/RS-422 networks
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel

Specifications

• Supply Voltage Range: 3V to 5.5V
• Data Rate: Up to 20Mbps
• Operating Temperature Range: -40°C to +85°C
• Number of Drivers/Receivers: 1 Driver, 1 Receiver
• Half-Duplex Operation: Yes
• ESD Protection: ±15kV Human Body Model (HBM)
• Low Power Consumption: 375µA (typical)

Pin Configuration

The MAX4903ETA+T has the following pin configuration:

```

---

| | --| VCC GND |-- Pin 1: Ground (GND) --| RO RE |-- Pin 2: Receiver Output (RO) --| DI DE |-- Pin 3: Driver Input (DI) --| DE DI |-- Pin 4: Driver Enable (DE) --| RE RO |-- Pin 5: Receiver Enable (RE) --| B A |-- Pin 6: Differential Bus Line (B) --| A B |-- Pin 7: Differential Bus Line (A) --| GND VCC |-- Pin 8: Power Supply (VCC) |___________| ```

Functional Features

• High-speed data transmission: Supports data rates up to 20Mbps, enabling fast communication over RS-485/RS-422 networks.
• Low power consumption: Consumes only 375µA of current, making it suitable for battery-powered applications.
• Half-duplex operation: Allows bidirectional communication on a single pair of wires, reducing the number of required connections.
• ESD protection: Provides ±15kV Human Body Model (HBM) electrostatic discharge protection, ensuring robustness in harsh environments.

Advantages and Disadvantages

Advantages: - High-speed data transmission capability - Low power consumption - Half-duplex operation simplifies wiring - ESD protection enhances reliability

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

Working Principles

The MAX4903ETA+T is designed to interface microcontrollers or other digital logic systems with RS-485/RS-422 networks. It uses differential signaling to transmit and receive data, allowing for noise-immune communication over long distances. The driver section converts the logic-level signals from the microcontroller into differential voltages on the bus lines, while the receiver section converts the received differential voltages back into logic-level signals.

Detailed Application Field Plans

The MAX4903ETA+T is commonly used in various industrial automation and control systems, including:

1. Building automation: Enables communication between sensors, actuators, and central control units in HVAC (Heating, Ventilation, and Air Conditioning) systems.
2. Process control: Facilitates data exchange between PLCs (Programmable Logic Controllers) and field devices such as sensors, motors, and valves.
3. Factory automation: Connects different machines and equipment on the factory floor, allowing for centralized monitoring and control.
4. Instrumentation: Provides reliable communication between measurement instruments and data acquisition systems in laboratory or industrial settings.

Detailed and Complete Alternative Models

• MAX485ESA+: Similar to MAX4903ETA+T, but available in a 8-pin SOIC (Small Outline Integrated Circuit) package.
• SN75176BP: RS-485/RS-422 transceiver with similar specifications, available in an 8-pin PDIP (Plastic Dual In-Line Package).
• LTC2850IMS#PBF: Low-power RS-485 transceiver with integrated ESD protection, available in a 10-pin MSOP (Mini Small Outline Package).

(Note: The above alternative models are just a few examples. There are many other alternatives available in the market.)

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