SPI/MICROWIRE-Compatible UART and ±15kV ESD-Protected RS-232 Transceivers with Internal Capacitors

Industry's-First Integrated Serial UART and Dual RS-232 IC

Please check latest availability status for a specific part variant.


The MAX3110E/MAX3111E combine a full-featured universal asynchronous receiver/transmitter (UART) with ±15kV ESD-protected RS-232 transceivers and integrated charge-pump capacitors into a single 28-pin package for use in space-, cost-, and power-constrained applications. The MAX3110E/MAX3111E also feature an SPI™/QSPI™/MICROWIRE™-compatible serial interface to save additional board space and microcontroller (µC) I/O pins.

A proprietary low-dropout output stage enables the 2-driver/2-receiver interface to deliver true RS-232 performance down to VCC = +3V (+4.5V for MAX3110E) while consuming only 600µA. The receivers remain active in a hardware/software-invoked shutdown, allowing external devices to be monitored while consuming only 10µA. Each device is guaranteed to operate at up to 230kbps while maintaining true EIA/TIA-232 output voltage levels.

The MAX3110E/MAX3111E's UART includes a crystal oscillator and baud-rate generator with software-programmable divider ratios for all common baud rates from 300baud to 230kbaud. The UART features an 8-word-deep receive FIFO that minimizes processor overhead and provides a flexible interrupt with four maskable sources. Two control lines (one input and one output) are included for hardware handshaking.

The UART and RS-232 functions can be used together or independently since the two functions share only supply and ground connections (the MAX3110E/MAX3111E are hardware- and software-compatible with the MAX3100 and MAX3222E).
MAX3110E, MAX3111E: Typical Application Circuit MAX3110E, MAX3111E: Typical Application Circuit Enlarge+

Key Features

  • Integration Reduces Cost and Board Space
    • Integrated RS-232 Transceiver and UART in a Single 28–Pin Package
      • Guaranteed 230kbps Data Rate
      • SPI/QSPI/MICROWIRE-Compatible µC Interface
    • Internal Charge-Pump Capacitors—No External Components Required
  • Low-Power Operation Reduces Thermal Dissipation
    • True RS-232 Operation Down to VCC = +3V (MAX3111E)
    • Single-Supply Operation
      • +5V (MAX3110E)
      • +3.3V (MAX3111E)
    • 600µA Supply Current
    • 10µA Shutdown Supply Current with Receiver Interrupt Active
  • Hardware/Software-Compatible with MAX3100 and MAX3222E


  • Handheld/Battery-Powered Equipment
  • Handy Terminals
  • Industrial Front-Panel Interfaces
  • Point-of-Sale (POS) Devices
  • Telecom/Networking Diagnostic Ports

Technical Documents

Tutorial 2141 Determining Clock Accuracy Requirements for UART Communications

Quality and Environmental Data

Product Reliability Reports: MAX3110E.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX3110ECNI
  • MAX3110ECNI+G36
  • MAX3110ECWI
  • MAX3110ECWI+G36
  • MAX3110ECWI+TG36
  • MAX3110ECWI-T
  • MAX3110EENI
  • MAX3110EENI+G36
  • MAX3110EEWI
  • MAX3110EEWI+G36
  • MAX3110EEWI+TG36
  • MAX3110EEWI-T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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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    Related Resources

    Electronics in Vehicles (ELIV) 2019
    10/16/2019 - 10/17/2019, Bonn, Germany
    The international VDI Congress ELIV (Electronics In Vehicles) is THE event for all experts in the field of electrical and electronical car engineering and integration of mechanical and electronical systems.