Analog Devices Inc./Maxim Integrated MAX3107EAG+

Overview

MAX3107EAG+ from Maxim Integrated is a dual-interface (I²C/SPI) UART IC with 128-word TX/RX FIFOs, fractional baud-rate generator, and integrated PLL enabling precise 24Mbps max data rates. It supports automatic half-duplex transceiver control, hardware/software flow control, and operates from +2.35V to +3.6V supply across –40°C to +85°C - ideal for RS-485 Profibus-DP industrial fieldbus nodes.

For engineers reviewing the MAX3107EAG+ datasheet, MAX3107EAG+ pinout, MAX3107EAG+ application, or MAX3107EAG+ equivalent, key selection considerations include its 24-pin TQFN (3.5mm × 3.5mm) package, register compatibility with MAX3108/MAX3109, I²C/SPI dual-bus flexibility, low 640µA typical active current at 1Mbaud, and integrated logic-level translation down to 1.7V on controller and transceiver interfaces.

Technical Context

The MAX3107EAG+ implements a fully programmable clocking architecture: an internal PLL with prescaler and fractional baud-rate generator decouples baud accuracy from reference clock stability, supporting high-resolution rate synthesis across wide input frequencies. Its 2x/4x rate modes enable up to 24Mbps operation under SPI clocking up to 26MHz.

It integrates autonomous interface management including auto RTS/CTS, XON/XOFF, echo suppression in half-duplex mode, and 9-bit multidrop filtering with special character detection. Four GPIOs support configurable interrupt triggering, status monitoring, or auxiliary control - all managed via a unified register map accessible over either I²C or SPI.

Key Specifications

Pinout & Package

MAX3107EAG+ is housed in a 24-pin TQFN package (3.5mm × 3.5mm, 0.5mm pitch) with exposed thermal pad. This compact, thermally efficient package supports high-density PCB layouts and meets JEDEC JESD51-7 thermal standards (θ_JA = 65°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar UART bridge applications.

Compared with MAX3108EAG+, the MAX3107EAG+ trades integrated LDO capability for wider supply voltage flexibility and identical performance; versus SC16IS752IPW, it delivers superior baud accuracy, higher speed, and autonomous RS-485 control - making it the only option for deterministic industrial fieldbus implementations.

Availability

MAX3107EAG+ is available at Aetrix Electronics and suitable for industrial automation gateways, automotive infotainment serial bridges, and portable medical diagnostic interfaces requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX3107EAG+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX3107EAG+ belongs to Maxim's high-performance UART product line, engineered specifically for robust, low-power, multi-protocol serial bridging in space-constrained and thermally demanding environments.

FAQ

What communication interfaces does the MAX3107EAG+ support?

The MAX3107EAG+ supports both I²C and SPI serial interfaces - selectable at power-up via the I2C/SPI pin state. It uses a shared register map across both buses, allowing seamless integration into systems with either controller architecture. The device supports I²C standard/fast-mode speeds and SPI clock rates up to 26MHz, with full register access including FIFO read/write, configuration, and status monitoring over either interface.

Does the MAX3107EAG+ include an internal oscillator?

Yes, the MAX3107EAG+ integrates a crystal oscillator circuit compatible with 1.8432MHz to 25MHz crystals, eliminating the need for an external oscillator. It also supports external clock sources and features an internal PLL with prescaler and fractional baud-rate generator - enabling highly accurate baud rates independent of crystal tolerance, critical for protocols like Profibus-DP.

How does the MAX3107EAG+ handle RS-485 half-duplex direction control?

The MAX3107EAG+ provides automatic transceiver direction control via its RTS/CLKOUT pin, programmable through the HDplxDelay register. It asserts RTS before transmission and deasserts it after a user-defined hold time, eliminating external direction logic. This feature is essential for reliable RS-485 half-duplex operation in high-speed fieldbus applications such as Profibus-DP, where timing margins are tight.

What power-saving modes are available on the MAX3107EAG+?

The MAX3107EAG+ offers three low-power states: autosleep (45–100µA), forced sleep (same current, synchronous entry), and shutdown (20µA typical). These modes disable the PLL, oscillator, and digital blocks while preserving register contents. Wake-up occurs automatically on serial activity or IRQ assertion - making the MAX3107EAG+ suitable for battery-powered portable and IoT edge devices requiring extended standby duration.

Is the MAX3107EAG+ pin-compatible with other UARTs in the MAX310x family?

Yes, the MAX3107EAG+ shares identical pinout and register-level compatibility with MAX3108EAG+ and MAX3109EAG+. This allows direct PCB-level substitution and firmware reuse across the family. Differences lie in feature sets - e.g., MAX3108 adds an integrated LDO, while MAX3109 includes additional GPIOs - but electrical and mechanical interfaces remain consistent for MAX3107EAG+.