MAX481EEPA+

Overview

The MAX481EEPA+ is a low-power, half-duplex RS-485/RS-422 transceiver manufactured by Analog Devices Inc. (Maxim Integrated). It operates from a single +5V supply with a voltage range of 4.75V to 5.25V and supports data rates up to 2.5Mbps. The device features ±15kV ESD protection on driver outputs and receiver inputs without latchup. It includes one driver and one receiver in an 8-pin Plastic DIP package. Key electrical parameters include a no-load supply current of 120µA to 250µA and a shutdown current of 0.5µA. Operating temperature ranges from -40°C to +85°C.

Feature Summary

• Provides ±15kV electrostatic discharge protection on all pins without latchup.
• Features a low-current shutdown mode consuming only 0.5µA when disabled.
• Includes thermal shutdown circuitry to protect against excessive power dissipation.
• Receiver input has a fail-safe feature guaranteeing a logic-high output if the input is open.

Applications

• Low-Power RS-485 Transceivers
• Low-Power RS-422 Transceivers
• Industrial-Control Local Area Networks

Procurement Notes

Verify the ordering suffix EEPA+ corresponds to the -40°C to +85°C temperature range and 8-pin Plastic DIP package. Confirm RoHS compliance status as specifications may vary by production batch. Ensure the source document matches the specific part number for accurate pinout and electrical characteristic validation.

Selection Notes

Select this component for harsh environments requiring high-speed communication up to 2.5Mbps. It is suitable for applications needing low standby power due to its shutdown capability. Compare with slew-rate-limited variants like the MAX483E if EMI reduction is prioritized over maximum speed. Ensure the system operates within the specified 4.75V to 5.25V supply range.

Part Context

This device belongs to the MAX481E/MAX483E/MAX485E/MAX487E–MAX491E series of low-power transceivers. It is designed for bidirectional data communications on multipoint bus transmission lines. The 'E' designation indicates enhanced ESD protection compared to standard versions. It functions as a half-duplex transceiver with independent driver and receiver enable controls.

Replacement Considerations

The MAX481EESA+ serves as a surface-mount equivalent in an 8-SOIC package. For non-ESD protected alternatives, consider the MAX481. Verify that replacement parts maintain the same half-duplex operation and 2.5Mbps data rate capability.

FAQ

How is the low-power shutdown mode activated?

Shutdown is initiated by bringing the Receiver Enable (-R-E-) pin high and the Driver Enable (DE) pin low simultaneously. The device draws 0.5µA in this state.

What is the fail-safe feature of the receiver?

The receiver input guarantees a logic-high output if the input is left open-circuit, preventing false triggering during idle or fault conditions.

Does the MAX481EEPA+ support full-duplex communication?

No, the MAX481E is designed specifically for half-duplex applications. Full-duplex variants in this family include the MAX488E through MAX491E.