MAX3291EPD+

Overview

The MAX3291EPD+ is a full-duplex RS-485/RS-422 transceiver featuring driver preemphasis circuitry to reduce intersymbol interference. It operates from a single +5V supply with a typical no-load current of 3mA and a shutdown mode drawing 100nA. The device supports data rates up to 10Mbps, offers a -7V to +12V common-mode input range, and includes fail-safe receiver inputs that guarantee a logic-high output when the bus is open. It utilizes a 14-pin Plastic DIP package and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• Driver preemphasis circuitry extends reliable communication distance and increases data rates by reducing intersymbol interference caused by long cables.
• Fail-safe receiver input guarantees a logic-high output if the differential input pins are left in an open-circuit state.
• Low-current shutdown mode reduces supply current to 100nA when both receiver and driver enable inputs are configured appropriately.
• 1/4-unit-load receiver input impedance allows connection of up to 128 transceivers on a single communication bus.

Applications

• Long-distance, high-speed RS-485/RS-422 communications
• Telecommunications systems
• Industrial-control local area networks

Procurement Notes

Verify the component matches the specific EPD suffix for the extended industrial temperature range (-40°C to +85°C) and 14-pin Plastic DIP package. Confirm the ordering designation includes the '+' symbol to ensure compliance with RoHS standards as documented in the manufacturer's specifications.

Selection Notes

Select this model for applications requiring fixed preemphasis timing optimized for 5Mbps to 10Mbps data rates. Choose the EPD variant over the CPD version when operation below 0°C is required. Ensure the system design accommodates the 14-pin through-hole footprint and provides adequate thermal dissipation for the specified power ratings.

Part Context

This component belongs to the MAX3291/MAX3292 family of high-speed interface transceivers. The MAX3291 variant features a fixed internal preemphasis interval, whereas the MAX3292 allows programmability via an external resistor. Both share identical pinouts and core functionality, differing primarily in preemphasis configuration flexibility.

Replacement Considerations

The datasheet lists the following pin-compatible replacements: ’75180, MAX489, MAX491, MAX3080, MAX3083, MAX3086, and MAX1482. Verify that substitute components support the required data rates and preemphasis capabilities if those features are critical to the application.