MAX491ECSD

Drivers, Receivers, Transceivers Overview

The MAX491ECSD is a full-duplex RS-422 and RS-485 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +5V supply (4.75V to 5.25V) and supports data rates up to 2.5Mbps. The device contains one driver and one receiver, featuring ±15kV ESD protection on all pins without latchup. It includes fail-safe receiver inputs that guarantee a logic-high output when the input is open-circuited. Driver outputs are short-circuit current limited and protected by thermal shutdown circuitry. The component is available in a 14-pin SOIC package.

Drivers, Receivers, Transceivers Feature Summary

• Full-duplex communication capability with independent driver and receiver enable controls
• Integrated ±15kV electrostatic discharge protection on driver outputs and receiver inputs
• Fail-safe receiver design ensuring a high logic state during open-circuit conditions
• Driver protection against excessive power dissipation via thermal shutdown

Drivers, Receivers, Transceivers Applications

• Industrial-control local area networks
• Low-power RS-485 and RS-422 communication systems
• Level translation applications
• Transceivers for EMI-sensitive environments

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'C' indicates the commercial temperature range of 0°C to +70°C, as opposed to the 'E' suffix which covers -40°C to +85°C. Confirm the 'SD' suffix corresponds to the 14-pin SOIC package type. Ensure the ordering information matches the exact manufacturer part number to avoid functional discrepancies related to temperature ratings or packaging variations.

Drivers, Receivers, Transceivers Selection Notes

Select this component for full-duplex applications requiring data rates up to 2.5Mbps. It is suitable for harsh environments due to robust ESD protection. Note that unlike the half-duplex MAX485E, this device requires separate control pins for driver and receiver enablement. Verify that the system voltage aligns with the specified 4.75V to 5.25V operating range.

Drivers, Receivers, Transceivers Part Context

The MAX491E belongs to the Maxim Integrated family of low-power RS-485/RS-422 transceivers. This series includes variants like the MAX481E, MAX483E, and MAX485E. The MAX491E specifically distinguishes itself as a full-duplex device, whereas many siblings in the group are designed for half-duplex operation. All members share common features such as ±15kV ESD protection and low standby current capabilities.

Drivers, Receivers, Transceivers Replacement Considerations

MAX491ESD+