MAX491ECPD+

Drivers, Receivers, Transceivers Overview

The MAX491ECPD+ is a low-power, full-duplex transceiver for RS-485 and RS-422 communications. It contains one driver and one receiver with unrestricted slew rates, supporting data transmission up to 2.5Mbps. The device operates from a single +5V supply (4.75V to 5.25V) and draws as little as 120µA in no-load conditions. It features ±15kV ESD protection on all pins without latchup, thermal shutdown circuitry, and short-circuit current limiting. The receiver input includes a fail-safe feature that guarantees a logic-high output if the input is open circuit. This specific variant utilizes a 14-pin Plastic DIP package and supports an operating temperature range of 0°C to +70°C.

Drivers, Receivers, Transceivers Feature Summary

• Full-duplex communication capability with independent driver and receiver enable controls
• Robust ±15kV electrostatic discharge protection on all pins ensuring operation without latchup
• Integrated thermal shutdown and short-circuit current limiting for fault tolerance
• Fail-safe receiver input that maintains a high logic state during open-circuit conditions

Drivers, Receivers, Transceivers Applications

• Low-Power RS-485 Transceivers
• Low-Power RS-422 Transceivers
• Level Translators
• Transceivers for EMI-Sensitive Applications
• Industrial-Control Local Area Networks

Drivers, Receivers, Transceivers Procurement Notes

Verify the complete part number against official manufacturer documentation to ensure correct suffix alignment. Confirm that the 'C' designation corresponds to the commercial temperature range and the 'PD' indicates the 14-pin plastic dual in-line package. Cross-reference the ordering information table in the datasheet to validate pinout compatibility and electrical specifications before integration into designs.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring full-duplex RS-485 or RS-422 communication at speeds up to 2.5Mbps. It is suitable for harsh environments due to its high ESD immunity and fail-safe receiver inputs. Ensure the system operates within the specified 4.75V to 5.25V voltage range and that the thermal environment remains within the 0°C to +70°C limit for this specific package variant.

Drivers, Receivers, Transceivers Part Context

The MAX491ECPD+ belongs to the MAX481E through MAX491E family of low-power transceivers designed for RS-485 and RS-422 standards. Unlike half-duplex variants in the series, the MAX491E provides full-duplex operation with separate transmit and receive channels. It shares common protective features such as thermal shutdown and ESD protection with other members of the family but is distinguished by its unrestricted driver slew rate allowing higher data throughput.

Drivers, Receivers, Transceivers Replacement Considerations

Direct functional replacements within the same family include the MAX491ECN+ (SOIC package) or MAX491EEPA (extended temperature DIP). For non-ESD sensitive applications where cost is critical, the standard MAX491EPD may be considered, though it lacks the enhanced ±15kV protection.