Maxim Integrated MAX491CSD+T Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

The MAX491CSD+T transceivers from Maxim Integrated are designed for RS-485 and RS-422 communication interfaces, offering a balance of high-performance and low-power operation. These devices are particularly suited for applications that require moderate data rates and long cable lengths. The MAX491CSD+T operates from a single 5V supply, and features a 1/4-unit load receiver input impedance that allows up to 128 transceivers on the bus.

Key Features

• Slew-Rate Limiting: The MAX491CSD+T features slew-rate limiting which minimizes electromagnetic interference (EMI) and reduces reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps.
• Low Power Consumption: With a low quiescent current draw, these transceivers are ideal for power-sensitive applications. They typically consume only 300µA of supply current.
• Extended Temperature Range: These devices are operational over a wide temperature range from -40°C to +85°C, making them suitable for industrial environments.
• Fail-Safe Receiver: The receiver output is guaranteed to be in a high state when the inputs are open, shorted, or connected to a terminated transmission line with all drivers disabled, ensuring a fail-safe condition for the receiver.
• Half-Duplex Communication: The transceivers support bidirectional communication on a single twisted-pair, simplifying the network topology and reducing cable costs.
• ESD Protection: They are equipped with enhanced electrostatic discharge (ESD) protection up to ±15kV using the Human Body Model, ensuring robust performance in harsh electrical environments.

Applications

The MAX491CSD+T is versatile and can be used in a variety of applications, including:

• Industrial-Control Local Area Networks
• Building Automation
• Networked Security Systems
• Data Acquisition Systems
• Remote Sensors

Offered in a space-saving 14-pin SOIC package, the MAX491CSD+T transceivers provide a reliable solution for data communication in complex industrial and commercial environments. Whether you are designing a new system or upgrading an existing one, the MAX491CSD+T from Maxim Integrated is an excellent choice for robust and efficient RS-485/RS-422 communication.