MAX22500EATB+T

Overview

The MAX22500EATB+T is a half-duplex RS-485/RS-422 transceiver optimized for high-speed communication over long cables. It supports data rates up to 100Mbps and operates on a 3V to 5.5V supply voltage, with a logic supply down to 1.6V. The device features integrated preemphasis circuitry to reduce inter-symbol interference, fail-safe receivers that guarantee a logic-high output when inputs are open or shorted for longer than 10μs, and hot-swap protection. It provides ±15kV ESD protection (HBM) and withstands ±4kV EFT. The component is housed in a 10-pin TDFN-EP package and operates within an ambient temperature range of -40°C to +125°C.

Feature Summary

• Integrated preemphasis circuitry reduces inter-symbol interference caused by long cable attenuation.
• Fail-safe receiver guarantees a logic-high output when differential inputs are open or shorted.
• Hot-swap protection prevents false driver transitions during board insertion or power-up events.
• Robust protection includes ±15kV ESD tolerance and ±4kV EFT immunity.

Applications

• Motion Control
• Encoder Interfaces
• Field Bus Networks
• Industrial Control Systems
• Backplane Busses

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and RoHS compliance status. Ensure the procurement channel sources directly from authorized distributors to avoid counterfeit components. Cross-reference the manufacturer part number with the latest datasheet revision to confirm pinout and electrical specifications match the design requirements.

Selection Notes

Select this component for applications requiring reliable high-speed transmission over extended cable lengths where signal integrity is critical. The integrated preemphasis feature specifically addresses inter-symbol interference, making it suitable for demanding industrial environments. Verify that the system logic levels are compatible with the 1.6V minimum logic supply requirement before finalizing the design.

Part Context

This component belongs to the MAX22500E/MAX22501E series of high-speed RS-485/RS-422 transceivers. While the MAX22501E variant lacks preemphasis capabilities, the MAX22500E variant includes this feature to enhance performance over long distances. Both share similar protection features and operating temperature ranges but differ in package options and internal circuitry.

Replacement Considerations

The MAX22501EATA+T serves as a functional substitute within the same family if preemphasis is not required. Verify pin compatibility and ensure the replacement part meets the specific thermal and electrical constraints of the existing application design.

FAQ

How is the preemphasis interval configured?

The preemphasis interval is set by connecting a resistor between the PSET pin and ground. The resistance value determines the duration of the preemphasis pulse relative to the data rate.

What happens when the receiver inputs are open or shorted?

The fail-safe receiver guarantees a logic-high output on the RO pin when the differential input voltage remains greater than -50mV for longer than 10μs, which occurs when inputs are open or shorted.

How does the device handle hot-swap conditions?

Internal pulldown and pullup circuits hold the DE pin low and the RE pin high for at least 10μs upon power-up or board insertion, preventing unwanted driver activation during hot-swap events.