MAX3483ESA+

Overview

The MAX3483ESA+ is a half-duplex RS-485/RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single 3.0V to 3.6V supply and supports data rates up to 250kbps. The device features slew-rate-limited drivers, one driver, and one receiver in an 8-pin SO package. It includes a low-current shutdown mode with typical current of 2nA. Operating temperature range is -40°C to +85°C. Supply current is typically 1.1mA active and 0.95mA standby.

Feature Summary

• Slew-rate-limited drivers minimize electromagnetic interference (EMI) and reduce signal reflections on improperly terminated cables.
• Low-power shutdown mode reduces supply current to approximately 2nA when both Receiver Enable (RE) is high and Driver Enable (DE) is low.
• Fail-safe receiver guarantees a logic-high output state if the differential inputs are left open-circuit.
• Driver outputs feature short-circuit current limiting and thermal shutdown protection against excessive power dissipation.

Applications

• Telecommunications systems
• Industrial-control local area networks
• EMI-sensitive applications requiring reduced noise emissions

Procurement Notes

Verify the component authenticity through official manufacturer channels or authorized distributors. Confirm the specific suffix 'ESA+' indicates the extended temperature range (-40°C to +85°C) and SOIC-8 package. Ensure compliance with RoHS directives as indicated by the '+' suffix. Cross-reference datasheet revision dates for any updates to electrical characteristics or pin configurations before finalizing procurement orders.

Selection Notes

Select this component for half-duplex RS-485 or RS-422 communication links operating at speeds up to 250kbps. It is suitable for designs requiring low EMI due to its slew-rate-limited driver architecture. Ensure the system voltage falls within the 3.0V to 3.6V range. Consider the 8ns propagation delay skew for timing-sensitive applications. Verify that the 8-pin SO package footprint matches the PCB layout requirements.

Part Context

The MAX3483ESA+ belongs to the MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491 family of 3.3V-powered transceivers. Within this series, it is distinguished by its half-duplex operation and slew-rate-limited driver, contrasting with full-duplex variants like the MAX3490 or higher-speed non-slew-limited models like the MAX3485.

Replacement Considerations

MAX3483ESA is a compatible variant with the same electrical specifications but limited to commercial temperature range (0°C to +70°C). ADM3483ARZ is a similar half-duplex RS-485 transceiver from Analog Devices, though specific parameter matching should be verified against the application requirements.

FAQ

How does the MAX3483 handle open-circuit receiver inputs?

The receiver incorporates a fail-safe feature that guarantees a logic-high output if both the A and B inputs are left open-circuit.

What conditions trigger the low-power shutdown mode?

Shutdown is initiated when the Receiver Enable (RE) pin is driven high and the Driver Enable (DE) pin is driven low simultaneously.

Why are slew-rate-limited drivers used in this transceiver?

Slew-rate limiting minimizes electromagnetic interference (EMI) and reduces signal reflections caused by improperly terminated transmission lines.