Analog Devices Inc./Maxim Integrated MAX3107ETG+T

Introduction to MAX3107ETG+T High-Speed UART

The MAX3107ETG+T, from Analog Devices Inc./Maxim Integrated, is a high-performance universal asynchronous receiver-transmitter (UART) IC, specifically designed to address robust serial communication requirements in modern embedded systems. Operating as a bridge interface between an SPI or I²C microprocessor bus and a range of asynchronous serial formats such as RS-232, RS-485, and IrDA, the MAX3107ETG+T stands out for its speed, flexibility, and deep buffering capabilities. Offered in compact 24-TQFN and SSOP packages, and rated for operation from –40°C to +85°C, it targets engineers seeking a reliable solution for compact and low-power serial interconnects in portable, industrial, and automotive electronics.

Primary Specifications and Functional Attributes of MAX3107ETG+T

The MAX3107ETG+T offers advanced capabilities that streamline integration and boost serial data throughput:

128-word deep FIFOs for both transmit and receive paths, minimizing host CPU load.

SPI interface supporting up to 26MHz and I²C interface up to 400kHz.

Maximum asynchronous data rate of 24Mbps in 2x and 4x modes.

Integrated phase-locked loop (PLL), predivider, and high-resolution fractional baud-rate generator, providing flexible and precise baud-rate setting with reduced dependence on reference clock frequency.

Autosleep and shutdown modes, with typical supply current as low as 640µA at 1Mbps, and only 20µA in shutdown.

Integrated logic-level translation on controller and transceiver interfaces, supporting voltages down to 1.7V.

Automatic hardware and software (XON/XOFF) flow control, and echo suppression for half-duplex links.

Flexible operation modes, including IrDA SIR/MIR compliance, multidrop (9-bit) data filtering, and block transfer-friendly FIFO interrupt structure.

Four independent general-purpose input/output (GPIO) pins for protocol extension or application-specific uses.

Comprehensive Design and Functional Operation of MAX3107ETG+T

At its core, the MAX3107ETG+T accepts configuration and data via 8-bit registers, accessible over SPI or I²C, enabling software control of all functional blocks. The UART engine manages all standard and extended data protocols, automatically adding framing bits, managing start/stop/parity, and reporting status and error feedback via status registers. Both receiver and transmitter paths are equipped with deep FIFOs, programmable trigger levels, and status interrupts for efficient, high-speed data handling. Additionally, each path has associated error detection (parity, frame, and line noise), with specific error flags and interrupt routing for robust data integrity monitoring.

Enhanced Data Management FIFO Buffers, Flow Regulation, and Multidrop Support in MAX3107ETG+T

The MAX3107ETG+T’s large 128-byte transmit and receive FIFOs are instrumental for high-volume continuous data flow, allowing the host processor to perform burst transfers and reducing the frequency of servicing interrupts. Trigger levels for both FIFOs are independently user-selectable, so engineers can tune buffer thresholds for optimal interrupt granularity and pipeline efficiency. Hardware flow control (RTS/CTS) can be handled autonomously by the device, supporting halt/resume thresholds and hysteresis, while auto software flow control (XON/XOFF—single or double character) adds flexibility for protocol implementation at various layers.

Multidrop (9-bit) mode is supported for applications such as multiprocessor links, with automatic, hardware-based address/data filtering that can use both register and external GPIO-based configurations. Special character detection and handling are integrated into the hardware, with flexible GPIO participation for address and protocol handshake purposes.

Flexible Clock Options and Baud Rate Adjustments in MAX3107ETG+T

One of the design highlights of the MAX3107ETG+T is its flexible and accurate baud rate generation. The device can use an onboard crystal oscillator or be clocked externally, with the PLL and predivider supporting a wide dynamic range of frequencies. The fractional baud-rate generator features a 16-bit integer divider and 4-bit fractional component, enabling precise baud rate setting deviating by as little as 0.0625 baud interval steps, critical for interoperability with a variety of hosts and legacy protocols. Support for 2x and 4x “oversampling” rates enables high data rates and adapts to noisy line environments, while trade-offs in noise resilience are well documented in the datasheet.

Energy Efficiency and Low-Power Capabilities of MAX3107ETG+T

Modern edge and portable applications demand power efficiency, and the MAX3107ETG+T meets this with a suite of power management strategies:

Autosleep and forced shutdown reduce average consumption, automatically entering low-power states when transmit/receive FIFOs are empty, with programmable wake-up on activity or host operation.

Power-down modes retain register configuration and interface readiness for rapid resume.

640µA typical current at 1Mbps, 20µA in shutdown, and support for external supply bypass of the internal LDO to further reduce losses.

Engineering options for minimizing power profile include disabling the internal PLL and using the lowest permissible supply voltages on VA, VL, and VEXT pins.

Interface Compatibility and Integration Strategies for MAX3107ETG+T

The MAX3107ETG+T is engineered for system integration:

Supports direct interfacing with microcontrollers/ASICs via SPI or I²C, with complete control over register space, initialization scripts, and polling/interrupt operation.

Features integrated dual-voltage logic-level translators: VL sets the controller interface logic level; VEXT sets the serial interface logic voltages. This allows interfacing across sub-3V and traditional 3.3V or 5V systems.

Flexible pin high-impedance states (HiZ on TX and RTS/CLKOUT) facilitate connector and bus sharing scenarios—e.g., coexistence with USB-UART bridges or multiple transceivers.

Four flexible GPIOs support push-pull/open-drain modes for custom handshake/control signals or in-protocol addressing.

Dedicated control over initialization, power-down, and wake-up via register access or hardware pins, accommodating both interrupt-driven and polled system architectures.

Use Cases and Development Recommendations for MAX3107ETG+T

The adaptability of the MAX3107ETG+T makes it suitable for scenarios including:

Portable devices demanding small footprints and extremely low system power, such as handheld medical or test equipment. The TQFN (3.5 x 3.5 mm) option minimizes PCB area.

Industrial fieldbus (e.g., Profibus-DP), building automation (HVAC, access systems), and other robust environments where programmable baud rates, strong error detection, and half/full-duplex support are vital.

Automotive infotainment, POS, or any application with strict ESD, noise resilience, or communication speed requirements.

Implementation of RS-485/RS-232/IrDA interfaces with minimal external component count—integrated oscillator, PLL, and logic-level translation streamline BOM and layout.

Multiprocessor serial busses, using the 9-bit multidrop mode with hardware address filtering to reduce host CPU load and protocol stack complexity.

Alternative or Substitute Devices Comparable to MAX3107ETG+T

In design selection contexts, engineers may consider the following related models depending on system requirements:

MAX3108 and MAX3109: Share register compatibility for software portability, but may feature different FIFO depth or interface specifics.

MAX14830: Offers similar functionality with expanded feature sets (multichannel UARTs, deeper FIFOs, etc.), suitable for more complex or higher-density applications.

When evaluating replacements, key considerations include register compatibility, FIFO size, supported interfaces, package availability, and operating temperature ranges. Always verify the critical interface, voltage, and timing requirements of the application to ensure full compatibility.

Conclusion

The MAX3107ETG+T from Analog Devices Inc./Maxim Integrated provides a versatile, feature-rich UART solution for engineers seeking high throughput, flexible integration, and low power in serial communication applications. Its deep FIFO buffers, precise baud rate generation, robust flow control, and advanced power management are designed to ease host processor load, support a wide array of protocols and voltages, and speed development for industrial, automotive, and portable designs. Engineers and procurement professionals seeking long-lifecycle support and straightforward replacement pathways within the Maxim Integrated family will find the MAX3107ETG+T an excellent foundation for reliable, high-performance serial connectivity.