MAX1490BCPG

Drivers, Receivers, Transceivers Overview

The MAX1490BCPG is a complete, electrically isolated RS-485/RS-422 data-communications interface solution manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +5V supply and supports full-duplex communication with a maximum data rate of 250kbps. The device features reduced-slew-rate drivers to minimize EMI and reflections. It provides typical isolation withstand of 1600V RMS (1 minute) or 2000V RMS (1 second). Key electrical characteristics include a shutdown supply current as low as 0.2µA, driver short-circuit current limiting, and thermal shutdown protection. The receiver input includes a fail-safe feature for open-circuit conditions. It is housed in a 24-pin Wide Plastic DIP package.

Drivers, Receivers, Transceivers Feature Summary

• Integrated optocouplers and transformer provide complete electrical isolation between logic and signal paths.
• Reduced-slew-rate drivers minimize electromagnetic interference and cable reflections.
• Low-power shutdown mode reduces supply current significantly when the oscillator is disabled.
• Fail-safe receiver guarantees a known output state if the differential input is open.

Drivers, Receivers, Transceivers Applications

• Isolated RS-485/RS-422 Data Interface Transceivers
• EMI-Sensitive Applications
• Industrial-Control Local Area Networks
• Automatic Test Equipment
• HVAC/Building Control Networks

Drivers, Receivers, Transceivers Procurement Notes

Verify the component authenticity through official manufacturer channels or authorized distributors. Confirm the specific suffix 'CPG' corresponds to the commercial temperature range (0°C to +70°C) and 24-pin DIP packaging. Ensure compatibility with existing PCB footprints and isolation requirements before integration.

Drivers, Receivers, Transceivers Selection Notes

Select this model for applications requiring full-duplex communication with strict EMI constraints due to its slew-rate limited drivers. It is suitable for systems needing robust galvanic isolation up to 2000V RMS. Consider the 250kbps data rate limit and the need for external pull-up resistors on the receiver output when designing the circuit.

Drivers, Receivers, Transceivers Part Context

This component belongs to the MAX1480/MAX1490 family of isolated transceivers. While similar to the MAX1480 series which offers half-duplex operation, the MAX1490 variant specifically supports full-duplex communication. The 'B' designation indicates the inclusion of reduced-slew-rate drivers, distinguishing it from the high-speed 'A' variants.

Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitutes include MAX1490ACPI and MAX1490AEPI. Note that these alternatives may differ in duplex mode (half vs. full) or data rate capabilities. Verify pinout compatibility and isolation voltage ratings before substitution.

Drivers, Receivers, Transceivers FAQ

What is the maximum isolation voltage rating?

The device typically withstands 1600V RMS for 1 minute or 2000V RMS for 1 second.

How does the shutdown feature work?

Pulling the SD pin high disables the internal power oscillator, reducing supply current to as low as 0.2µA.

What is the purpose of the FS pin?

The FS pin selects the switching frequency of the isolated power driver, allowing optimization for performance or minimal supply current.