MAX22502EATC+

Overview

The MAX22502EATC+ is a full-duplex, ESD-protected RS-485/RS-422 transceiver optimized for high-speed communication over long cables. It supports data rates up to 100Mbps and operates with a supply voltage range of 3V to 5.5V. The device features integrated preemphasis circuitry that reduces inter-symbol interference when supplied with 5V. It includes hot-swap protection and fail-safe receivers that ensure a logic-high output if inputs are shorted or open for longer than 10μs. The component is housed in a 12-pin TDFN-EP (3mm x 3mm) package and operates within an ambient temperature range of -40°C to +125°C.

Feature Summary

• Integrated preemphasis circuitry extends reliable communication distance by reducing inter-symbol interference on long cables.
• High receiver hysteresis provides increased noise rejection and improved signal integrity.
• Hot-swap protection prevents false driver transitions during power-up or hot-plug events.
• Fail-safe receiver guarantees a logic-high output when differential inputs are shorted or open.

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 packaging format and RoHS compliance status. Confirm availability through authorized distributors as stock levels fluctuate. Ensure the procurement channel sources genuine components from Analog Devices Inc./Maxim Integrated to maintain reliability and warranty coverage.

Selection Notes

Select this component for applications requiring full-duplex RS-485/RS-422 communication at speeds up to 100Mbps over extended cable lengths. The integrated preemphasis feature is critical for mitigating signal distortion in high-speed environments. Ensure the system design accommodates the 12-pin TDFN-EP package dimensions and thermal requirements for the intended operating temperature range.

Part Context

This part belongs to the MAX2250xE family of ESD-protected RS-485/RS-422 transceivers designed for robust industrial communications. It shares functional similarities with other members like the MAX22500E and MAX22501E but offers distinct full-duplex operation compared to their half-duplex counterparts. The device is manufactured by Analog Devices Inc./Maxim Integrated.

Replacement Considerations

Direct substitutes include other MAX2250xE series devices such as the MAX22500EATB+ or MAX22501EATA+T, though these are half-duplex variants. For full-duplex replacements, verify compatibility with the MAX22507E/MAX22508E series, noting differences in package types and specific interface configurations.

FAQ

How is the preemphasis interval configured?

The preemphasis interval is set by connecting a resistor (RPSET) between the PSET pin and ground. An optimum interval ranges from 1 to 1.5 unit intervals, calculable using the formula RPSET = 400x10^9 / DR.

What triggers the fail-safe receiver functionality?

The fail-safe function guarantees a logic-high on the receiver output (RO) when the differential receiver input voltage remains less than 50mV for more than 10μs, typically occurring when inputs are shorted or open.

What is the purpose of the VL pin?

The VL pin serves as the logic supply input, defining the interface logic levels for DE, DI, and RO. It must be maintained between 1.6V and VCC for normal operation.