SPI/I²C UART with 128-Word FIFOs

SPI/I²C UART with 128-word FIFO in a Tiny TQFN


The MAX3107 is an advanced universal asynchronous receiver-transmitter (UART) with 128 words each of receive and transmit first-in/first-out (FIFO) that can be controlled through I²C or high-speed SPI™. The 2x and 4x rate modes allow a maximum of 24Mbps data rates. A phase-locked loop (PLL), prescaler, and fractional baud-rate generator allow for high-resolution baud-rate programming and minimize the dependency of baud rate on reference clock frequency.

Autosleep and shutdown modes help reduce power consumption during periods of inactivity. A low 640µA (typ) supply current and tiny 24-pin TQFN (3.5mm x 3.5mm) package make the MAX3107 ideal for low-power portable devices.

Integrated logic-level translation on the controller and transceiver (RX/TX and active-low RTS/active-low CTS) interfaces enable use with a wide selection of RS-232/RS-485 transceivers.

Automatic hardware and software flow control with selectable FIFO interrupt triggering offloads low-level activity from the host controller. Automatic half-duplex transceiver control with programmable setup and hold times allow the MAX3107 to be used in high-speed applications, for example Profibus-DP.

The MAX3107 is ideal for use in portable devices and industrial applications. The MAX3107 is available in a 24-pin SSOP package and a 24-pin TQFN package. It is specified over the -40°C to +85°C extended ambient temperature range.
MAX3107: Functional Diagram MAX3107: Functional Diagram Enlarge+

Key Features

  • 24-Pin, Lead-Free TQFN (3.5mm x 3.5mm) and 24-Pin, Lead-Free SSOP Packages
  • 24Mbps (max) Data Rate
  • Integrated PLL and Divider
  • Fractional Baud-Rate Generator
  • SPI Up to 26MHz Clock Rate
  • Auto Transceiver Direction Control
  • Half-Duplex Echo Suppression
  • Auto RTS/CTS and XON/XOFF Flow Control
  • Special Character Detection
  • GPIO-Based Character Detection
  • 9-Bit Multidrop-Mode Data Filtering
  • SIR- and MIR-Compliant IrDA Encoder/Decoder
  • +2.35V to +3.6V Supply Range
  • Logic-Level Translation on the Controller and Transceiver Interfaces (Down to 1.7V)
  • Four Flexible GPIOs
  • Line Noise Indication
  • Shutdown and Autosleep Modes
  • Low 640µA (typ) Supply Current at 1Mbaud and 20MHz Clock
  • Low 20µA (typ) Shutdown Power


  • Fieldbus Networks
  • HVAC or Building Control
  • Industrial Control Systems
  • Medical Systems
  • Point-of-Sale Systems
  • Portable Devices
Part Number µP I/F Channels ICC
Oper. Temp.
typ See Notes
MAX3107  SPI and I2C Compatible 1 0.64 2.35 to 3.6 -40 to +85 $4.99 @1k
See All SPI/Microwire-Compatible UARTs (8)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX3107EVKIT: Evaluation Kit for the MAX3107

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