MAX3131EAI+T

Overview

The MAX3131EAI+T is a hybrid microcircuit integrating an IrDA infrared transceiver and a full RS-232 interface within a single 28-pin SSOP package. It operates on a single +3.0V to +5.5V supply, delivering true RS-232 performance via a high-efficiency dual charge-pump power supply. The infrared channel supports IrDA data rates from 2.4kbps to 115kbps with a high-power LED driver capable of sinking 200mA. The RS-232 section provides two drivers and two receivers supporting data rates up to 120kbps, typically operating at 235kbps. Selectable shutdown modes reduce supply current to 1µA.

Feature Summary

• Integrates IrDA 1.2 compatible infrared transceiver and RS-232 interface in a single package
• Includes on-board encoder/decoder (ENDEC) for compatibility with non-IrDA UARTs
• Features high-current infrared LED drive capability up to 200mA
• Provides low-power shutdown mode reducing supply current to 1µA

Applications

• Personal Digital Assistants (PDAs)
• Palmtop Computers
• Battery-Powered Systems
• Hand-Held Equipment
• IrDA Applications

Procurement Notes

Verify the component status as discontinued or obsolete through official manufacturer channels before procurement planning. Confirm availability of parameter-equivalent replacement parts such as the MAX3131EAI+ if the specific tape-and-reel suffix variant is unavailable. Ensure that any substitute components maintain identical pinout and electrical specifications to guarantee system compatibility without redesign.

Selection Notes

Select this component when simultaneous independent IrDA and RS-232 communication is required using separate data lines. Verify that the application environment falls within the -40°C to +85°C operating temperature range. Ensure the design accommodates the necessary external optical components, including a PIN photodiode and an IR LED, along with four small capacitors for the charge pump circuitry.

Part Context

This device belongs to the MAX3130/MAX3131 family of 3V to 5.5V hybrid microcircuits. The MAX3131 variant specifically features separate IrDA and RS-232 transceivers with independent data inputs and outputs, distinguishing it from the multiplexed MAX3130. Both devices are designed to minimize external component count while providing robust communication interfaces for portable electronics.

Replacement Considerations

The MAX3131EAI+ is documented as a parameter-equivalent replacement part.