MAX3084ECSA+

Overview

The MAX3084ECSA+ is a full-duplex RS-422/RS-485 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +5V supply (4.75V to 5.25V) and supports data rates up to 500kbps with slew-rate limiting enabled. The device integrates one driver and one receiver, featuring ±15kV ESD protection on all I/O pins and fail-safe circuitry that guarantees a logic-high receiver output when inputs are open or shorted. It draws a typical quiescent current of 375µA and accommodates up to 256 transceivers on the bus due to its 1/8-unit-load input impedance. The component is housed in an 8-pin SOIC package and functions within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Fail-safe receiver circuitry ensures a logic-high output state during bus idle conditions or input faults.
• Slew-rate-limited drivers minimize electromagnetic interference and reduce signal reflections on improperly terminated cables.
• Enhanced electrostatic discharge protection rated at ±15kV via Human Body Model for robust industrial operation.
• High input impedance allows connection of up to 256 transceivers to a single communication bus.

Applications

• RS-422 and RS-485 serial communication networks
• Industrial control local area networks (LANs)
• Level translation between microprocessors and differential buses
• Communication systems requiring high noise immunity in electrically noisy environments

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type, temperature grade, and tape-and-reel specifications. Ensure compatibility with RoHS directives and check for any recent lifecycle status changes such as obsolescence or recommended replacements before finalizing procurement orders.

Selection Notes

Select this component for applications requiring full-duplex communication with moderate speed limits up to 500kbps. It is suitable where low power consumption and high ESD tolerance are critical. Verify that the system voltage aligns with the specified 5V operating range and that the thermal environment remains within the commercial temperature boundaries defined for the ECSA variant.

Part Context

This device belongs to the MAX3080E–MAX3089E family of high-speed transceivers designed for RS-485/RS-422 interfaces. The family differentiates models primarily through duplex mode capabilities and selectable slew-rate limits. The MAX3084E specifically provides full-duplex operation with fixed 500kbps slew-rate limiting, distinguishing it from half-duplex variants and higher-speed uncontrolled slew-rate models.

Replacement Considerations

The datasheet indicates pin compatibility with industry-standard parts like the 75180, though functional features may differ. Direct cross-reference should be validated against updated Analog Devices substitution guides to ensure electrical parameter alignment and pinout consistency.

FAQ

How does the MAX3084E handle open or shorted receiver inputs?

The device incorporates fail-safe circuitry that guarantees a logic-high receiver output if the differential inputs (A-B) are open, shorted, or connected to a terminated line with all drivers disabled.

What is the maximum number of transceivers supported on the bus?

Due to the 1/8-unit-load receiver input impedance, the MAX3084E allows up to 256 transceivers to be connected to a single bus network.

Does the MAX3084E support shutdown mode?

No, the MAX3084E does not feature a low-current shutdown mode; only specific variants within the MAX3080E-MAX3089E family, excluding the MAX3081E, MAX3084E, and MAX3087E, include this capability.