SPI/I²C UART with 128-Word FIFOs

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

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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, industrial, and automotive 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

  • Bridges an SPI/MICROWIRE or I2C Microprocessor Bus to an Asynchronous Interface Such as RS-485, RS-232, or IrDASM
    • SIR- and MIR-Compliant IrDA Encoder/Decoder
    • Line Noise Indication Ensures Data Link Integrity
  • Saves Up to 23% Board Space
    • 24-Pin TQFN (3.5mm x 3.5mm) and SSOP Packages
  • Integrated Internal Oscillator Eliminates the Need for an External Oscillator and Reduces the BOM Cost
    • Integrated PLL and Divider
  • Fast Data Rates Allow Maximum System Flexibility Across Interface Standards
    • 24Mbps (max) Data Rate
    • Fractional Baud-Rate Generator
    • SPI Up to 26MHz Clock Rate
  • Deep, 128-Word Buffer and Automated Control Features Help Offload Activity on the Microcontroller
    • Auto Transceiver Direction Control
    • Half-Duplex Echo Suppression
    • Auto RTS/CTS and XON/XOFF Flow Control
    • 9-Bit Multidrop-Mode Data Filtering
      • Special Character Detection
      • GPIO-Based Character Detection
      • Four Flexible GPIOs
  • Power Management Control Features Minimize Power Consumption for Portable Applications
    • +2.35V to +3.6V Supply Range
      • Low 640µA (typ) Supply Current at 1Mbaud and 20MHz Clock
    • Shutdown and Autosleep Modes
      • Low 20µA (typ) Shutdown Power
  • Logic-Level Translation on the Controller and Transceiver Interfaces (Down to 1.7V) Ensure System Compatibility
  • Register Compatible with MAX3108, MAX3109, MAX14830


  • Automotive Infotainment Systems
  • Fieldbus Networks
  • HVAC or Building Control
  • Industrial Control Systems
  • Medical Systems
  • Point-of-Sale Systems
  • Portable Devices

See parametric specs for SPI/Microwire-Compatible UARTs (6)

Part NumberµP I/FChannelsICC
Package/PinsOper. Temp.
typSee Notes
MAX3107 SPI and I2C Compatible10.642.35 to 3.6
-40 to +85$5.24 @1k

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
Product Reliability Reports: MAX3107.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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