MAX3291ESD+

Overview

The MAX3291ESD+ is a full-duplex RS-485/RS-422 transceiver featuring driver preemphasis circuitry to extend communication distance and data rates by reducing intersymbol interference. It operates from a single +5V supply with a low-current shutdown mode drawing 100nA. The device supports data rates of 5Mbps to 10Mbps, offers a fail-safe receiver input guaranteeing a logic-high output when the input is open, and features a 1/4-unit-load receiver impedance allowing up to 128 transceivers on the bus. It includes driver output short-circuit current limiting and a -7V to +12V common-mode input voltage range.

Feature Summary

• Driver preemphasis circuitry reduces intersymbol interference for high-speed, long-distance communication
• Low-current shutdown mode reduces supply current to 100nA
• Fail-safe receiver input guarantees a logic-high output if the input is open circuit
• 1/4-unit-load receiver input impedance allows up to 128 transceivers on the bus

Applications

• Long-Distance, High-Speed RS-485/RS-422 Communications
• Telecommunications
• Industrial-Control Local Area Networks

Procurement Notes

Verify the component against official Analog Devices / Maxim Integrated datasheets to confirm pinout compatibility and electrical specifications. Ensure the ordering suffix matches the required temperature range and package type. Cross-reference part numbers with authorized distributors to validate authenticity and avoid counterfeit components.

Selection Notes

Select this component for applications requiring extended cable lengths or higher data rates where standard RS-485 transceivers suffer from intersymbol interference. The fixed preemphasis interval suits designs needing industry-standard pin-compatibility at data rates between 5Mbps and 10Mbps. Consider the MAX3292 variant if programmable preemphasis intervals are necessary for lower data rates.

Part Context

The MAX3291ESD+ belongs to the MAX3291/MAX3292 family of high-speed RS-485/RS-422 transceivers. These devices are designed to overcome limitations of conventional drivers in noisy or long-cable environments. The ESD suffix indicates an industrial temperature range of -40°C to +85°C, while the SO package denotes a 14-pin Small Outline package.

Replacement Considerations

The MAX3291 is pin-compatible with the ’75180, MAX489, MAX491, MAX3080, MAX3083, MAX3086, and MAX1482.