MAX22501EATA+T

Overview

The MAX22501EATA+T is a half-duplex RS-485/RS-422 transceiver optimized for high-speed communication over long cables. It operates at data rates up to 100Mbps and supports a supply voltage range of 3V to 5.5V. The device features integrated hot-swap protection and fail-safe receiver functionality, ensuring a logic-high output when inputs are shorted or open for longer than 10μs. It lacks the preemphasis circuitry found in the MAX22500E variant. The component is housed in an 8-pin TDFN-EP package with a 0.65mm pitch and operates within an ambient temperature range of -40°C to +125°C.

Feature Summary

• Integrated hot-swap protection prevents false driver transitions during power-up or hot-plug events.
• Fail-safe receiver guarantees a logic-high output state when differential inputs are shorted or open for extended periods.
• High common-mode rejection with symmetrical receiver thresholds minimizes duty cycle distortion.
• Low-power shutdown mode reduces supply current to a maximum of 5μA.

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. Confirm that the TDFN-EP package dimensions match the design footprint requirements. Ensure the absence of preemphasis aligns with system signal integrity needs. Validate thermal dissipation capabilities for the target operating environment.

Selection Notes

Select this component when preemphasis is unnecessary but high-speed operation over long cables is required. Compare the 8-pin TDFN-EP package against the μMAX option based on board space constraints. Verify compatibility with logic levels between 1.6V and VCC. Consider the ±15kV ESD protection rating for harsh industrial environments.

Part Context

This part belongs to the MAX22500E/MAX22501E family of ESD-protected RS-485/RS-422 transceivers. Unlike the MAX22500E, which includes integrated preemphasis, the MAX22501E omits this feature to simplify interface requirements while maintaining identical protection and speed characteristics. Both variants share the same core architecture for robust long-distance communication.

Replacement Considerations

The MAX22500EATB+T serves as a functional substitute if preemphasis capability is desired or acceptable. The MAX22501EAUA+ offers the same electrical performance in an 8-pin μMAX package instead of TDFN. Verify pinout compatibility and package thermal resistance differences before substitution.

FAQ

Does the MAX22501E support preemphasis?

No, the MAX22501E does not include integrated preemphasis circuitry. This feature is exclusive to the MAX22500E variant.

What is the fail-safe behavior of the receiver?

The receiver guarantees a logic-high output on RO when the differential input voltage is greater than -50mV for longer than 10μs, covering conditions where inputs are shorted or open.

How is the device placed into shutdown mode?

Shutdown is activated by driving the RE input high and the DE input low simultaneously. The device draws a maximum of 5μA in this state.