MAX3238EEAI+T

Overview

The MAX3238EEAI+T is a true RS-232 transceiver manufactured by Analog Devices/Maxim Integrated, designed for notebook and subnotebook applications. It operates on a single +3.0V to +5.5V supply and features five drivers and three receivers. The device achieves a typical supply current of 1µA in shutdown mode via AutoShutdown Plus™ technology, which activates after 30 seconds of inactivity. It supports data rates up to 250kbps with a guaranteed 6V/µs slew rate. The component includes an always-active R1OUTB output for monitoring purposes and provides ±15kV ESD protection on I/O pins. It is housed in a 28-pin SSOP package.

Feature Summary

• AutoShutdown Plus™ technology reduces power consumption by shutting down the internal charge pump and drivers when no signal transitions are detected for 30 seconds.
• Integrated dual charge-pump power supply generates required RS-232 voltage levels from a single low-voltage supply without external transformers.
• Receiver R1 includes an extra noninverting complementary output (R1OUTB) that remains active during shutdown to monitor external devices like modems.
• Flow-through pinout design simplifies PCB layout and allows direct compatibility with standard RS-232 interface requirements.

Applications

• Notebook, Subnotebook, and Palmtop Computers
• High-Speed Modems
• Battery-Powered Equipment
• Hand-Held Equipment

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm the 'E' designation corresponds to the industrial temperature range of -40°C to +85°C. Ensure the '+'' suffix confirms lead-free and RoHS compliance status as per manufacturer specifications. Cross-reference the ordering code with official distributor catalogs to confirm availability and exact package variant.

Selection Notes

Select this component for systems requiring low-power standby modes in portable electronics where battery life is critical. The 250kbps data rate ensures compatibility with standard PC communication software. Verify that the 28-pin SSOP package fits the available board space constraints. Consider the always-active R1OUTB feature if ring indicator monitoring is required while the main system is powered down or in sleep mode.

Part Context

The MAX3238 belongs to Maxim's family of low-voltage RS-232 transceivers designed for mobile computing. It serves as a bridge between TTL/CMOS logic levels and RS-232 standards. The EEAI+T variant specifically denotes the industrial temperature grade, tape-and-reel delivery format, and lead-free construction. It replaces older high-voltage transceivers in modern 3.3V and 5V mixed-signal environments.

Replacement Considerations

Public confirmed substitute part numbers include MAX3238EEAI+ (tube version) and MAX3238IPWG4Q1 (automotive grade). Verify pin compatibility and electrical characteristics before substitution. Ensure the replacement maintains the same AutoShutdown functionality and ESD protection levels for equivalent performance.