MAX3085EPA+

Overview

The MAX3085EPA+ is a half-duplex RS-485/RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +5V supply and contains one driver and one receiver. The device supports data rates up to 500kbps with slew-rate-limited drivers to minimize EMI. It features fail-safe circuitry that guarantees a logic-high receiver output when inputs are open or shorted. The receiver input impedance is 1/8-unit-load, allowing up to 256 transceivers on the bus. It includes ±15kV ESD protection and low-power shutdown mode.

Feature Summary

• Fail-safe receiver circuitry ensures a logic-high output when inputs are open or shorted
• Slew-rate-limited drivers reduce electromagnetic interference and signal reflections
• 1/8-unit-load receiver input impedance supports high node counts on the bus
• Low-power shutdown mode minimizes supply current consumption

Applications

• RS-422/RS-485 communications
• Industrial-control local area networks
• Transceivers for EMI-sensitive applications

Procurement Notes

Verify the specific suffix 'E' indicates the extended temperature range of -40°C to +85°C and 'PA+' denotes the PDIP-8 package with lead-free/RoHS compliance. Confirm the manufacturer designation as Analog Devices Inc./Maxim Integrated. Ensure the component matches the exact part number to guarantee correct electrical characteristics and pinout compatibility.

Selection Notes

Select this component for half-duplex RS-485/RS-422 applications requiring data rates up to 500kbps. It is suitable for systems needing fail-safe operation and reduced EMI through slew-rate limiting. Compare against other family members like MAX3082 (115kbps) or MAX3088 (10Mbps) based on speed requirements. Verify power supply constraints match the +5V operating voltage.

Part Context

The MAX3085EPA+ belongs to the MAX3080–MAX3089 series of high-speed transceivers. This family shares common features such as ±15kV ESD protection and 1/8-unit-load receivers. The MAX3085 specifically provides a balance between speed and EMI reduction via its 500kbps slew-rate limit, distinguishing it from the slower MAX3082 and faster MAX3088 within the same package.

Replacement Considerations

Public confirmed substitute part numbers: DP3085.