MAX3085CSA+T

Overview

The MAX3085CSA+T is a half-duplex RS-485/RS-422 transceiver featuring one driver and one receiver. It supports data rates up to 500kbps with slew-rate-limited drivers to minimize EMI. The device incorporates fail-safe circuitry that guarantees a logic-high receiver output when inputs are open or shorted. It operates on a single +5V supply (4.75V to 5.25V) with a typical quiescent current of 375µA. The receiver input impedance is 1/8-unit-load, allowing up to 256 transceivers on the bus. It is housed in an 8-pin SOIC package and rated for commercial temperatures from 0°C to +70°C.

Feature Summary

• Fail-safe circuitry ensures a logic-high receiver output during idle or fault conditions
• Slew-rate-limited drivers reduce electromagnetic interference and signal reflections
• 1/8-unit-load receiver input impedance supports high node density on the bus

Applications

• RS-422/RS-485 communications
• Industrial-control local area networks
• Level translators

Procurement Notes

Verify the specific suffix CSA+T against official documentation to confirm the commercial temperature range and lead-free status. Ensure the ordering code matches the exact package style required for your PCB layout. Cross-reference the manufacturer's latest datasheet revision to confirm pinout compatibility and electrical characteristics before finalizing procurement.

Selection Notes

Select this component for applications requiring half-duplex communication at speeds up to 500kbps. It is suitable for environments where reduced EMI is necessary due to its slew-rate limitation. Verify that the system operates within the specified 4.75V to 5.25V voltage range and that the commercial temperature rating meets the operational requirements.

Part Context

This part belongs to the MAX3080–MAX3089 family of high-speed transceivers designed for RS-485 and RS-422 standards. The MAX3085 variant specifically provides half-duplex operation with a 500kbps data rate capability. It shares common features like fail-safe outputs and low power consumption with other members of the series, differing primarily in duplex mode and speed limits.

Replacement Considerations

Pin-compatible alternatives include the MAX3485EESA+T for higher speed requirements or the SN65HVD3082. Verify that any substitute maintains the 500kbps slew-rate limit and 1/8-unit-load input impedance to ensure bus compatibility.