MAX3292EPD+

Overview

The MAX3292EPD+ 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, programmable via an external resistor on the PSET pin. The device includes a low-current shutdown mode drawing 100nA, a fail-safe receiver input guaranteeing a logic-high output when open, and a 1/4-unit-load impedance allowing up to 128 transceivers on the bus. It provides -7V to +12V common-mode input range and short-circuit current limiting.

Feature Summary

• Driver preemphasis circuitry extends reliable communication distance and increases data rate by reducing intersymbol interference caused by long cables.
• Data rate is programmable up to 10Mbps using a single external resistor connected to the PSET pin.
• Fail-safe receiver input guarantees a logic-high output if the differential input is left in an open-circuit state.

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 -40°C to +85°C temperature range and 14-pin Plastic DIP package. Confirm that the ordering information aligns with the manufacturer's official documentation for the MAX3292 series before finalizing procurement.

Selection Notes

Select the MAX3292EPD+ over the MAX3291 when flexible preemphasis timing is required, as the MAX3292 allows interval adjustment via an external resistor. Ensure the application utilizes a single +5V supply and requires full-duplex operation with support for up to 128 nodes on the bus.

Part Context

This component belongs to the MAX3291/MAX3292 family of high-speed RS-485/RS-422 transceivers. It is designed to overcome limitations of conventional drivers by incorporating preemphasis, enabling higher data rates or longer cable lengths compared to standard interfaces without this feature.

Replacement Considerations

The datasheet lists the MAX3291CSD, MAX3291CPD, MAX3291ESD, MAX3292CSD, MAX3292CPD, and MAX3292ESD as pin-compatible alternatives within the same series.

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.

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

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

How does the device enter low-power shutdown mode?

Shutdown is initiated by driving the RE pin high and the DE pin low simultaneously.