MAX3109ETJ+T

Overview

The MAX3109ETJ+T is a dual universal asynchronous receiver-transmitter (UART) featuring 128-word receive and transmit FIFOs. It supports SPI or I2C controller interfaces with data rates up to 24Mbps using 2x and 4x rate modes. The device includes an integrated PLL, fractional baud-rate generators, and independent logic-level translation for VCC, VL, and VEXT supplies ranging from 1.71V to 3.6V. It operates within the -40°C to +85°C temperature range and is housed in a 32-pin TQFN package.

Feature Summary

• Independent logic-level translation on transceiver and controller interfaces enables compatibility with microcontrollers, FPGAs, and transceivers powered by differing supply voltages.
• Automatic hardware and software flow control with selectable FIFO interrupt triggering offloads low-level activity from the host controller.
• Integrated PLL and fractional baud-rate generators provide high flexibility in baud-rate programming and reference clock selection.

Applications

• Handheld Devices
• Programmable Logic Controllers (PLCs)
• Medical Systems
• Point-of-Sales Systems

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm RoHS compliance and package type. Confirm availability status directly with authorized distributors as stock levels fluctuate. Ensure the component matches the required voltage specifications and interface protocols before procurement.

Selection Notes

Select this component when system design requires dual UART channels with deep buffering to reduce processor overhead. Verify that the application utilizes SPI or I2C for control and requires asynchronous communication via RS-485, RS-232, or IrDA. Ensure supply voltages align with the 1.71V to 3.6V operating range.

Part Context

The MAX3109 belongs to the Maxim Integrated dual serial UART family. It is register compatible with the MAX3107, MAX3108, and MAX14830. The ETJ suffix indicates a 32-pin TQFN package with exposed pad, designed for surface-mount assembly in compact electronic systems.

Replacement Considerations

The MAX3107, MAX3108, and MAX14830 are documented as register-compatible alternatives. Verify pinout and feature parity before substitution. No other direct substitutes are confirmed in the provided datasheet.