MAX3292ESD+

Overview

The MAX3292ESD+ is a full-duplex RS-485/RS-422 transceiver featuring driver preemphasis circuitry to reduce intersymbol interference. It operates from a single +5V supply and supports data rates up to 10Mbps. The device includes a low-current shutdown mode with typical supply current of 100nA. It features a fail-safe receiver input that guarantees a logic-high output when the input is open, and a 1/4-unit-load receiver impedance allowing up to 128 transceivers on the bus. The ESD suffix indicates an extended temperature range of -40°C to +85°C.

Feature Summary

• Driver preemphasis circuitry extends reliable communication distance and increases data rate by reducing intersymbol interference caused by long cables.
• Programmable preemphasis interval via external resistor allows optimization for various baud rates up to 10Mbps.
• Fail-safe receiver input ensures a logic-high output state if the differential inputs are left open.
• Low-current shutdown mode significantly reduces power consumption during idle periods.

Applications

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

Procurement Notes

Verify the component authenticity through official manufacturer channels or authorized distributors. Confirm the specific ordering suffix matches the required temperature range and package type. Ensure the procurement documentation aligns with the latest datasheet specifications to avoid compatibility issues in design implementation.

Selection Notes

Select the MAX3292 over the MAX3291 when programmable preemphasis timing is required for data rates below 10Mbps. The MAX3292 utilizes an external resistor to set the preemphasis interval, offering flexibility for varying cable lengths and baud rates compared to the fixed internal timing of the MAX3291.

Part Context

This component belongs to the MAX3291/MAX3292 family of high-speed RS-485/RS-422 transceivers. It shares pin compatibility with legacy devices such as the SN75180, MAX489, MAX491, MAX3080, MAX3083, MAX3086, and MAX1482, facilitating direct upgrades in existing designs requiring improved performance over long distances.

Replacement Considerations

Pin-compatible replacements include MAX3291CSD+, MAX489ESA, MAX491ESA, MAX3080ESA, MAX3083ESA, MAX3086ESA, and MAX1482ESA. Verify that the substitute part supports the necessary data rate and preemphasis requirements for the specific application.

FAQ

How is the preemphasis interval configured on the MAX3292?

The preemphasis interval is set by connecting a resistor (RPSET) from the PSET pin to VCC. A capacitor (CPSET) should also be connected from PSET to VCC for bypassing.

What is the maximum number of transceivers supported on the bus?

The MAX3292 features a 1/4-unit-load receiver input impedance, allowing up to 128 transceivers to be connected on a single communication line.

How does the fail-safe feature operate?

The receiver input guarantees a logic-high output if the differential inputs (A and B) are left open-circuited, preventing undefined states in the system.