MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

The MAX1487 from Maxim Integrated is a robust, low-power transceiver for RS-485 and RS-422 communication that features slew-rate-limited drivers. This device is designed to improve the quality of communication and to extend the reach of the network by reducing electromagnetic interference (EMI) through its controlled driver output slew rates.

The MAX1487 transceiver operates from a single 5V supply and draws a very low supply current of 300µA typical when unloaded or fully loaded with the drivers disabled. The low power consumption makes it an ideal choice for energy-efficient applications. It is also fully compliant with the EIA/TIA-485 standard.

With its half-duplex communication capability, the MAX1487 is capable of transmitting and receiving data at speeds up to 2.5Mbps. The device features a driver differential output and receiver input sensitivity of ±200mV, allowing for reliable data transmission over long cable runs or in electrically noisy environments.

The transceiver includes a fail-safe feature that ensures a logic-high receiver output if the receiver inputs are open or shorted. This feature provides additional safety in the event of a line fault. Additionally, the MAX1487 features thermal shutdown and current limiting to protect against driver overload and to ensure the integrity of the network during fault conditions.

Designed for space-constrained applications, the MAX1487 is available in an 8-pin PDIP or SO package. It is suitable for a wide range of applications, including industrial control, telecommunications, and networking equipment.

Key features of the MAX1487 include:

• Low-power operation
• Slew-rate-limited drivers for reduced EMI
• Half-duplex communication
• Up to 2.5Mbps data rate
• ±200mV receiver input sensitivity
• Fail-safe receiver for open, short, or idle-bus conditions
• Thermal shutdown and current limiting
• Available in 8-pin PDIP or SO packages

Overall, the MAX1487 is a reliable and efficient solution for applications requiring RS-485 or RS-422 communication, combining low-power consumption with high-performance data transmission capabilities.