MAX483EPA+

Overview

The MAX483EPA+ is a low-power, half-duplex RS-485 and RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It integrates one driver and one receiver in an 8-pin PDIP package. The device supports data rates up to 250kbps with slew-rate-limited drivers to minimize EMI. It operates from a single 5V supply (4.75V to 5.25V) and features a low-current shutdown mode consuming only 0.1µA. The receiver includes a fail-safe feature guaranteeing a logic-high output if the input is open circuit.

Feature Summary

• Slew-rate-limited drivers reduce electromagnetic interference (EMI) and reflections on improperly terminated cables.
• Low-power operation with a dedicated shutdown mode for minimal current consumption when disabled.
• Fail-safe receiver design ensures a defined high logic state during open-circuit input conditions.

Applications

• Industrial-control local area networks
• Transceivers for EMI-sensitive applications
• Low-power RS-485 communication systems
• Low-power RS-422 communication systems

Procurement Notes

Verify the component authenticity through official manufacturer channels or authorized distributors. Confirm the specific ordering suffix matches the required temperature range and package type. Ensure compliance with relevant environmental standards such as RoHS before finalizing procurement decisions.

Selection Notes

Select this component for half-duplex applications requiring reduced EMI at data rates up to 250kbps. It is suitable for designs needing low quiescent current and a shutdown mode. Compare against non-slew-rate variants like the MAX485 if higher speeds are necessary. Verify bus load requirements as this part uses standard unit-load impedance.

Part Context

The MAX483 belongs to the MAX481/MAX483/MAX485 family of low-power transceivers. Unlike the MAX485 which supports 2.5Mbps, the MAX483 limits its slew rate to achieve lower power consumption and reduced signal reflections. This makes it distinct within the series for noise-sensitive environments.

Replacement Considerations

The MAX487EPA+ offers similar electrical characteristics but supports up to 128 devices on the bus due to quarter-unit-load impedance. The MAX485EPA+ provides higher speed capability but lacks slew-rate limiting.