MAX3085CSA

Overview

The MAX3085CSA+ is a half-duplex RS-485/RS-422 transceiver manufactured by Analog Devices (Maxim Integrated). It operates on a single +5V supply and features fail-safe circuitry that guarantees a logic-high receiver output when inputs are open or shorted. The device incorporates slew-rate-limited drivers to minimize electromagnetic interference, supporting data transmission rates up to 500kbps. It includes one driver and one receiver with a 1/8-unit-load input impedance, allowing up to 256 devices on the bus. Typical quiescent current is 375µA.

Feature Summary

• Fail-safe receiver circuitry ensures a logic-high output during idle or fault conditions
• Slew-rate-limited drivers reduce electromagnetic emissions and signal reflections
• High input impedance supports extensive network topologies with up to 256 nodes

Applications

• RS-422 and RS-485 communication networks
• Industrial control local area networks
• EMI-sensitive applications requiring controlled signal transitions

Procurement Notes

Verify the specific suffix against official documentation to confirm temperature range and packaging type. Confirm RoHS compliance status for the exact part number variant. Ensure the ordering code matches the required operational specifications before procurement.

Selection Notes

Select this component for half-duplex applications requiring moderate speed and low power consumption. Verify that the system voltage aligns with the specified +5V requirement. Consider thermal dissipation limits if operating near maximum ambient temperatures.

Part Context

This device belongs to the MAX3080–MAX3089 family of high-speed transceivers. It shares architectural similarities with other members like the MAX3084 and MAX3088 but is specifically configured for half-duplex operation with a 500kbps slew-rate limit.

Replacement Considerations

Publicly confirmed pin-compatible substitutes include the MAX3485ECSA+. Verify electrical parameters such as supply voltage and data rate compatibility before substitution.