MAX3491CPD

Overview

The MAX3491CPD is a low-power, true RS-485 and RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single 3V to 3.6V power supply without requiring a charge pump. The device integrates one driver and one receiver, supporting data rates up to 12Mb/s with slew-rate limiting for errorless transmission. It features a -7V to +12V common-mode input voltage range and provides 15kV ESD protection on all pins. The component is housed in a 14-pin PDIP package and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• Operates from a single 3.3V supply eliminating the need for internal charge pumps
• Provides high electromagnetic immunity through slew-rate limited outputs
• Ensures signal integrity with a wide -7V to +12V common-mode input range
• Includes robust 15kV ESD protection on all interfaces

Applications

• Industrial control systems utilizing RS-485 multi-drop networks
• Building automation and lighting control applications
• Process control instrumentation requiring reliable serial communication
• Data acquisition systems interfacing with remote sensors

Procurement Notes

Verify the specific suffix 'CPD' against current manufacturer documentation to confirm package type and temperature grade. Confirm availability status as older Maxim products may have lifecycle changes. Ensure compatibility with existing PCB footprints for the 14-pin PDIP configuration during sourcing.

Selection Notes

Select this component when designing half-duplex RS-485 or full-duplex RS-422 links requiring 3.3V operation. It is suitable for applications needing moderate data rates up to 12Mb/s with inherent noise filtering. Compare against the ADM3491 series if full-duplex isolation or higher speed is required. Verify that the 14-pin DIP package fits the mechanical constraints of the target enclosure.

Part Context

This part belongs to the MAX349x family of low-power transceivers designed for bus communication. It shares functional similarities with the MAX3485 and MAX3490 but offers higher data rate capabilities. The MAX3491CPD specifically denotes the commercial temperature grade variant in a plastic dual in-line package, distinguishing it from industrial or military grade alternatives within the same product line.

Replacement Considerations

The ADM3491EARZ is a pin-compatible alternative from Analog Devices offering similar functionality. Direct replacements include other MAX3491 variants with different packaging options such as SOIC or TSSOP. Verify electrical specifications match before substituting.