MAX483CSA+T

Overview

The MAX483CSA+T is a low-power, half-duplex RS-485 and RS-422 transceiver manufactured by Analog Devices Inc. (Maxim Integrated). It integrates one driver and one receiver within an 8-pin SOIC package. The device supports data rates up to 250kbps with slew-rate-limited drivers to minimize electromagnetic interference. It operates from a single 5V supply, drawing 120µA in active mode and 0.1µA in shutdown. Key electrical parameters include a differential output voltage of 2.5V typical, a receiver input hysteresis of 70mV, and a common-mode input range of -7V to +12V.

Feature Summary

• Slew-rate-limited drivers reduce EMI and reflections for error-free transmission on improperly terminated cables.
• Low-power shutdown mode reduces supply current to 0.1µA when both driver and receiver are disabled.
• Fail-safe receiver guarantees a logic-high output if the input pins are left open circuit.
• Driver outputs feature short-circuit current limiting and thermal shutdown protection.

Applications

• Industrial-control local area networks
• EMI-sensitive applications requiring reduced signal harmonics
• Low-power RS-485 communication systems
• Level translators between microcontrollers and bus lines

Procurement Notes

Verify the component origin through official manufacturer channels or authorized distributors. Confirm that the ordering suffix matches the required temperature range and package type. Ensure compliance with RoHS directives as indicated by the plus sign in the part number. Request original datasheets to validate specifications against counterfeit risks before finalizing procurement decisions.

Selection Notes

Select this component for half-duplex applications requiring data rates up to 250kbps. The slew-rate limitation makes it suitable for environments where electromagnetic interference must be minimized. Compare quiescent current requirements against other models in the series to ensure compatibility with low-power system designs. Verify that the 5V supply voltage aligns with the target system architecture.

Part Context

This device belongs to the MAX48x family of low-power transceivers designed for RS-485 and RS-422 standards. It shares architectural similarities with the MAX481 and MAX485 but differs in its maximum data rate specification. The family provides various options for full-duplex operation and higher speed capabilities, positioning this specific model as a cost-effective solution for moderate-speed industrial communication buses.

Replacement Considerations

MAX483ESA+T: Industrial temperature grade (-40°C to +85°C) version of the same functional device.

FAQ

How does the MAX483 handle an open receiver input?

The receiver includes a fail-safe feature that guarantees a logic-high output state if the A and B input pins are left open circuit.

What is the mechanism for entering the low-power shutdown mode?

Shutdown is initiated by driving the Receiver Enable (RE) pin high and the Driver Enable (DE) pin low simultaneously for at least 600ns.

Why are the drivers slew-rate limited in this model?

The limited slew rate minimizes electromagnetic interference (EMI) and reduces signal reflections caused by improperly terminated cables.