MAX3490ECSA-T

Overview

The MAX3490ECSA-T is a full-duplex RS-485/RS-422 transceiver operating from a single +3.3V supply without a charge pump. It supports data rates up to 12Mbps with a typical propagation delay of 22ns and skew of 8ns. The device provides ±15kV ESD protection (HBM) and withstands ±8kV IEC 1000-4-2 contact discharge. It features current-limiting and thermal shutdown for driver overload protection, a -7V to +12V common-mode range, and fail-safe receiver inputs. Packaged in an 8-pin SOIC, it operates within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Full-duplex communication architecture supporting simultaneous transmission and reception
• Integrated ±15kV electrostatic discharge protection on all RS-485 I/O pins
• Driver outputs protected against short circuits and excessive power dissipation via thermal shutdown
• Receiver input fail-safe feature guarantees a logic-high output when inputs are open circuit

Applications

• Telecommunications systems
• Industrial-control local area networks
• Transceivers for EMI-sensitive applications
• Integrated services digital networks
• Packet switching environments

Procurement Notes

Verify the specific suffix 'C' indicates the commercial temperature range (0°C to +70°C), distinct from the industrial grade 'E' variant (-40°C to +85°C). Confirm the 'T' suffix corresponds to tape-and-reel packaging requirements for automated assembly processes. Cross-reference the manufacturer's official ordering guide to ensure compatibility with the intended PCB footprint and RoHS compliance status.

Selection Notes

Select this component for designs requiring full-duplex RS-485 or RS-422 connectivity at speeds up to 12Mbps. It is suitable for applications needing robust ESD immunity and operation from a standard 3.3V logic supply. Ensure the design environment remains within the 0°C to +70°C commercial temperature limits. Consider the 8-pin SOIC package dimensions for layout constraints.

Part Context

This part belongs to the MAX3483E family of low-power transceivers manufactured by Analog Devices Inc./Maxim Integrated. The MAX3490E specifically provides full-duplex functionality, unlike the half-duplex MAX3485E. It utilizes the industry-standard 75176 pinout configuration, facilitating direct replacement in legacy designs while offering enhanced ESD protection characteristics compared to older generations.

Replacement Considerations

MAX3490EESA+T

FAQ

Does the MAX3490ECSA-T support a low-power shutdown mode?

No, the MAX3490E does not include Receiver Enable (RE) or Driver Enable (DE) control pins required for the low-power shutdown mode found in other family members like the MAX3485E.

What is the common-mode input voltage range for this transceiver?

The device supports a common-mode input voltage range of -7V to +12V, allowing operation on buses with significant common-mode noise or offset.

How does the MAX3490E handle driver overload conditions?

It employs current-limiting circuitry to protect against short circuits and thermal shutdown circuitry that forces outputs to a high-impedance state if die temperature exceeds safe limits.