MAX3085CPA+

Overview

The MAX3085CPA+ 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 transmission 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 component utilizes an 8-pin Plastic DIP package and is rated for operation within a temperature range of 0°C to +70°C.

Feature Summary

• Fail-safe circuitry ensures a logic-high receiver output during bus idle, open, or shorted conditions.
• Slew-rate-limited drivers reduce electromagnetic interference and signal reflections on improperly terminated cables.
• 1/8-unit-load receiver input impedance allows connection of up to 256 transceivers on a single communication line.

Applications

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

Procurement Notes

Verify the specific suffix 'CPA+' against the manufacturer's current ordering information to confirm the PDIP-8 package and commercial temperature range. Ensure compatibility with existing board layouts requiring through-hole mounting. Confirm RoHS compliance status as indicated in the official datasheet documentation before finalizing procurement specifications.

Selection Notes

Select this component for half-duplex RS-485 applications requiring 500kbps data rates. It is suitable for systems needing fail-safe behavior without external components. Consider alternative packages like SOIC if surface-mount technology is required. Verify that the +5V supply voltage aligns with the system power architecture.

Part Context

This part belongs to the MAX3080–MAX3089 family of high-speed transceivers designed for RS-485 and RS-422 standards. The MAX3085 specifically provides half-duplex operation with a 500kbps maximum data rate. It shares pinout compatibility with industry-standard devices while offering enhanced noise immunity and low quiescent current characteristics typical of the Maxim Integrated portfolio.

Replacement Considerations

Publicly confirmed substitute part numbers include MAX3485CPA+ and MAX13085ECPA+. Verify electrical parameters such as supply voltage and data rate before substitution.