MAX3080ECSD+

Overview

The MAX3080ECSD+ is a full-duplex RS-422/RS-485 transceiver in a 14-pin SOIC package. It operates from a single +5V supply (4.75V to 5.25V) within an industrial temperature range of 0°C to +70°C. The device features one driver and one receiver with fail-safe circuitry that guarantees a logic-high output when inputs are open or shorted. It supports data rates up to 115kbps with slew-rate limiting to minimize EMI. Quiescent current is typically 375µA, dropping to 1nA in shutdown mode. The component provides ±15kV ESD protection on all I/O pins.

Feature Summary

• Fail-safe receiver circuitry ensures a logic-high output state during bus idle conditions or input disconnection.
• Slew-rate limited drivers reduce electromagnetic interference and signal reflections for reliable communication.
• Integrated thermal shutdown protects the driver outputs from excessive power dissipation.
• Enhanced electrostatic discharge protection rated at ±15kV via Human Body Model.

Applications

• RS-422 and RS-485 serial communication networks
• Industrial control local area networks
• EMI-sensitive applications requiring reduced signal reflections

Procurement Notes

Verify the specific suffix 'C' indicates the commercial temperature range (0°C to +70°C), distinct from the 'E' suffix which covers -40°C to +85°C. Confirm the 'SD+' designation corresponds to the 14-pin Small Outline package. Ensure compliance with RoHS directives as indicated by the plus sign in the part number before finalizing procurement orders.

Selection Notes

Select this component for full-duplex applications requiring error-free transmission up to 115kbps. The integrated slew-rate limiting makes it suitable for long cable runs or improperly terminated lines where high-speed edges cause reflections. It is not appropriate for half-duplex systems without modification, nor for temperatures below 0°C.

Part Context

This device belongs to the MAX3080E–MAX3089E family of high-speed transceivers. While pin-compatible with industry-standard parts like the 75180, it offers enhanced ESD protection and fail-safe features. The MAX3080E specifically is designed for full-duplex operation with fixed low slew rates, distinguishing it from higher-speed variants in the series.

Replacement Considerations

The datasheet notes pin compatibility with the 75180. Engineers should verify that the replacement maintains the required fail-safe threshold and ESD protection levels if substituting with other RS-485 transceivers.

FAQ

How does the fail-safe feature function?

The receiver guarantees a logic-high output when the differential input voltage (A-B) is greater than or equal to -50mV. This occurs when inputs are open, shorted, or connected to a terminated line with all drivers disabled.

What is the maximum data rate for this specific model?

The MAX3080E is limited to a maximum data rate of 115kbps due to its fixed slew-rate limiting, which minimizes EMI and reflections.

Does the MAX3080ECSD+ support half-duplex operation?

No, the MAX3080E is intended exclusively for full-duplex communications. Half-duplex functionality is available in other members of the family, such as the MAX3082E.