MAX487 Low-Power Slew-Rate-Limited RS-485/RS-422 Transceiver – Half-Duplex 8-Pin DIP

The MAX487 is a low-power transceiver for RS-485 and RS-422 communication, engineered for reliable data transmission in electrically noisy industrial environments. By limiting the slew rate, this IC ensures error-free data transfer at rates up to 250 kbps, even over long cable runs where signal reflections are a common issue. This IC is a professional choice for building multi-point networks, such as building automation systems, industrial control links, and remote sensor arrays. Its ability to support up to 128 nodes on a single bus makes it significantly more scalable than standard RS-485 transceivers. The MAX487 also includes an active-low receiver enable and an active-high driver enable, giving the processor full control over the communication direction. The 8-pin DIP through-hole package is highly durable and easy to integrate into both vintage and modern systems. Whether you are designing a robust MODBUS network or a simple long-distance serial link, the MAX487 provides the efficiency and reliability required for professional-grade communication.

Key Features:

Slew-Rate Limited Internal circuitry controls the signal transition times to reduce electromagnetic interference and minimize reflections caused by improperly terminated cables.

High Node Count Features a quarter-unit-load input impedance, allowing up to 128 transceivers to be connected to a single communication bus.

Half-Duplex Operation Supports bidirectional communication over a single twisted pair, reducing wiring complexity and system cost.

Fail-Safe Architecture Guarantees a logic-high receiver output state if the inputs are open-circuited, preventing error signals during line breaks.

Integrated Protection Includes thermal shutdown and current-limiting circuitry to protect against output short circuits and bus contention.