MAX3089CPD+

Overview

The MAX3089CPD+ is a high-speed RS-485/RS-422 transceiver housed in a 14-pin Plastic DIP package. It operates on a single +5V supply (4.75V to 5.25V) and features selectable half-duplex or full-duplex modes via the H/F pin. The device supports three data rates—115kbps, 500kbps, and 10Mbps—controlled by the SRL pin. It includes fail-safe circuitry ensuring a logic-high receiver output when inputs are open or shorted. Quiescent current is typically 375µA, with shutdown current at 10nA maximum. Operating temperature range is 0°C to +70°C.

Feature Summary

• Configurable duplex operation allows selection between half-duplex and full-duplex communication modes.
• Programmable slew-rate limiting enables data rate selection from 115kbps up to 10Mbps.
• Fail-safe design guarantees a logic-high receiver output during input disconnection or short-circuit conditions.
• Independent phase control pins allow inversion of transmitter and receiver signal polarity.

Applications

• RS-422 and RS-485 serial communication networks
• Industrial-control local area networks
• Level translation interfaces for EMI-sensitive applications

Procurement Notes

Verify the specific suffix 'CPD+' corresponds to the 14-pin Plastic DIP package and the commercial temperature range of 0°C to +70°C. Confirm that the component is sourced from Analog Devices or Maxim Integrated to ensure authenticity. Check datasheet revisions for any updates regarding electrical characteristics or pin configurations before finalizing procurement orders.

Selection Notes

Select this component when flexible configuration of duplex mode and data transmission speed is required within a single package. It is suitable for systems needing independent control over transmitter and receiver signal phases. Ensure the application environment remains within the specified 0°C to +70°C operating temperature range and utilizes a standard +5V power supply.

Part Context

This part belongs to the MAX3080–MAX3089 family of high-speed transceivers designed for RS-485 and RS-422 standards. Unlike fixed-function variants in the series, the MAX3089 offers programmable operational modes. It shares the same 1/8-unit-load receiver impedance as other family members, supporting extensive bus topologies.

Replacement Considerations

The MAX3089CSD+ serves as a surface-mount alternative with identical electrical specifications but utilizes a 14-SOIC package. Other family members like the MAX3086 offer fixed 10Mbps performance without the configurability of the MAX3089.

FAQ

How is the data rate selected on the MAX3089?

The data rate is determined by the state of the SRL pin. Connecting it to VCC selects 500kbps, connecting it to GND selects 10Mbps, and leaving it unconnected selects 115kbps.

What happens if the receiver inputs are left open?

The fail-safe circuitry ensures that the receiver output (RO) goes to a logic-high state if the differential input voltage is greater than -50mV, which occurs when inputs are open or shorted.

Can the transmitter and receiver phases be inverted independently?

Yes, the TXP pin controls the transmitter phase and the RXP pin controls the receiver phase. Driving these pins high inverts their respective signal polarities.