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

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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
Product Reliability Reports: MAX3110E.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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