MAX3490CPA

Overview

The MAX3490CPA is a full-duplex RS-422/RS-485 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +3.3V supply without requiring a charge pump, ensuring interoperability with +5V logic. The device features ±15kV ESD protection on I/O pins and supports data rates up to 12Mbps with slew-rate limiting for errorless transmission. It includes current-limiting and thermal shutdown for driver overload protection. The component functions within a -7V to +12V common-mode input voltage range and is available in an 8-pin PDIP package.

Feature Summary

• Full-duplex communication capability supporting RS-422 and RS-485 standards
• Integrated ±15kV ESD protection on receiver inputs and driver outputs
• Slew-rate limited output drivers to minimize electromagnetic interference
• Built-in thermal shutdown and current limiting for driver protection

Applications

• Industrial automation networks requiring robust noise immunity
• Building automation systems utilizing RS-485 bus topologies
• Embedded control systems interfacing with high-speed serial peripherals

Procurement Notes

Verify the specific suffix 'CPA' indicates the plastic DIP package variant when sourcing. Confirm the manufacturer source is Analog Devices or Maxim Integrated to ensure authenticity. Check RoHS compliance status as manufacturing processes evolve. Validate that the required data rate of 12Mbps aligns with system timing constraints before procurement.

Selection Notes

Select this component for applications requiring full-duplex operation at speeds up to 12Mbps. Ensure the design utilizes a +3.3V power rail, as the device lacks internal charge pumps for higher voltages. Verify that the environmental temperature range meets the commercial specifications associated with the CPA suffix. Consider the PDIP package form factor if through-hole mounting is necessary for the target assembly.

Part Context

The MAX3490CPA belongs to the MAX3483E family of low-power transceivers designed for RS-485 and RS-422 communications. This series emphasizes low standby current and high reliability in electrically noisy environments. The CPA designation specifically identifies the plastic dual in-line package configuration within the broader MAX3490 product line.

Replacement Considerations

The MAX3490ESA+ serves as a pin-compatible alternative offering an SOIC-8 surface-mount package with similar electrical characteristics. Designers requiring lead-free compliance should verify the specific RoHS status of replacement parts against the original component's certification.