MAX3089CSD+

Overview

The MAX3089CSD+ is a high-speed RS-485/RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It features one driver and one receiver with fail-safe circuitry that guarantees a logic-high receiver output when inputs are open or shorted. The device supports selectable half-duplex or full-duplex operation via the H/F pin. Slew rates are programmable to 115kbps, 500kbps, or 10Mbps using the SRL pin. 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 (96kΩ), allowing up to 256 transceivers on the bus. It is housed in a 14-pin SOIC package.

Feature Summary

• Programmable slew-rate limiting for EMI reduction and reflection control across three data rate modes
• Selectable half-duplex or full-duplex communication modes via dedicated hardware pin
• Fail-safe receiver design ensuring logic-high output during idle or fault conditions
• Independent phase inversion controls for both transmitter and receiver signals

Applications

• RS-422 and RS-485 serial communications networks
• Industrial-control local area networks
• Level translation applications requiring configurable speed and duplex modes

Procurement Notes

Verify the specific suffix 'CSD+' against the manufacturer's official ordering information to confirm the temperature range (-40°C to +85°C) and package type (14-SOIC). Ensure compatibility with system voltage requirements (+5V ±5%) and interface protocols before procurement.

Selection Notes

Select this component when flexible configuration of data rate and duplex mode is required within a single package. It is suitable for designs needing adjustable slew rates to balance between high-speed performance and electromagnetic interference mitigation. Verify that the 1/8-unit-load receiver capability meets the network node count requirements.

Part Context

The MAX3089 belongs to the MAX3080–MAX3089 family of fail-safe, high-speed transceivers. Unlike fixed-function variants in this series, the MAX3089 offers unique configurability for duplex mode and transmission speed, making it distinct from the standard MAX3080 or MAX3086 models.

Replacement Considerations

Pin-compatible alternatives include other members of the MAX308x family such as the MAX3080 or MAX3086, though these lack the programmable slew-rate and duplex selection features of the MAX3089.