MAX3109ETJ+

Overview

The MAX3109ETJ+ is an advanced dual universal asynchronous receiver-transmitter (UART) featuring 128-word receive and transmit FIFOs. It supports high-speed SPI or I2C controller interfaces with data rates up to 24Mbps using 2x and 4x rate modes. The device includes a phase-locked loop (PLL) and fractional baud-rate generators for flexible clock selection. Independent logic-level translation on transceiver and controller interfaces allows interfacing with microcontrollers, FPGAs, and transceivers powered by differing supply voltages. It operates from a 1.71V to 3.6V supply range and is specified over the -40°C to +85°C extended temperature range in a 32-pin TQFN package.

Feature Summary

• Dual UART architecture with 128-word FIFOs and automated flow control features
• Integrated PLL and fractional baud-rate generators for flexible clock programming
• Independent logic-level translation on controller and transceiver interfaces
• Automatic half-duplex transceiver control with programmable setup and hold times

Applications

• Handheld Devices
• Power Meters
• Programmable Logic Controllers (PLCs)
• Medical Systems
• Point-of-Sales Systems
• HVAC or Building Control

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status via official documentation. Ensure proper handling of ESD-sensitive components during storage and assembly. Check datasheet revisions for any updates to electrical characteristics or pin configurations before finalizing design implementations.

Selection Notes

Select this component when system requirements include dual independent UARTs within a compact footprint. Consider its capability for bridging SPI/MICROWIRE or I2C buses to asynchronous interfaces like RS-485, RS-232, or IrDA. Evaluate power consumption constraints against shutdown and autosleep modes. Verify voltage compatibility across different logic domains using the integrated translation features.

Part Context

The MAX3109 belongs to Maxim Integrated's family of serial communication controllers designed for embedded systems. It offers register compatibility with the MAX3107, MAX3108, and MAX14830, facilitating potential migration paths. The device integrates multiple functions into a single package to reduce board space and simplify system design for portable and industrial applications.

Replacement Considerations

The MAX3107, MAX3108, and MAX14830 are documented as register-compatible alternatives. Verify pinout and feature parity before substitution. Ensure that specific interface requirements and power specifications align with the replacement part's capabilities.