MAX3238EEAI+

Overview

The MAX3238EEAI+ is a true RS-232 transceiver manufactured by Analog Devices / Maxim Integrated. It operates on a single +3.0V to +5.5V supply and features five drivers and three receivers for full-duplex communication. The device supports data rates up to 250kbps with a guaranteed 6V/µs slew rate. It incorporates AutoShutdown Plus technology, reducing supply current to 1µA when no signal transitions are detected for 30 seconds. The component includes 15kV ESD protection on I/O and logic pins, utilizes an SSOP-28 package, and functions within a temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown Plus functionality reduces power consumption by shutting down the internal charge pump and drivers after 30 seconds of inactivity, resuming operation upon valid signal detection.
• Integrated dual charge-pump power supply generates required RS-232 voltage levels from a single low-voltage supply without external transformers.
• Receiver R1 provides an always-active complementary output (R1OUTB) to monitor modem signals like Ring Indicator without forward-biasing protection diodes during system shutdown.
• Flow-through pinout design simplifies PCB layout and ensures compatibility with standard serial port implementations.

Applications

• Notebook, subnotebook, and palmtop computers
• High-speed modems
• Battery-powered equipment and handheld devices

Procurement Notes

Verify the specific suffix 'EAI+' corresponds to the industrial temperature grade (-40°C to +85°C) and SSOP-28 package configuration. Confirm RoHS compliance status as indicated in official manufacturer documentation. Ensure ordering details match the exact part number to avoid functional discrepancies related to temperature ratings or packaging variations.

Selection Notes

Select this component for systems requiring low-power RS-232 connectivity in portable electronics. It is suitable for mixed 3.3V and 5.0V logic environments. Consider the 1µA shutdown current for battery-operated applications. Verify that the 250kbps data rate meets system requirements and that the SSOP-28 footprint fits the design constraints.

Part Context

The MAX3238 belongs to the MAX3238E series of multichannel RS-232 line drivers and receivers. It is designed as a complete serial port solution for notebook and subnotebook computers. The device integrates all necessary components for RS-232 communication, including charge pumps, into a compact space-saving package.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified source material.