+3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control Transceivers

Please check latest availability status for a specific part variant.


The MAX3171/MAX3173 are three-driver/three-receiver multiprotocol transceivers that operate from a single +3.3V supply. The MAX3171/MAX3173, along with the MAX3170 and MAX3172/MAX3174, form a complete software-selectable data terminal equipment (DTE) or data communications equipment (DCE) interface port that supports V.28 (RS-232) and V.10/V.11 (RS-449, V.36, EIA-530, EIA-530-A, X.21, RS-423) protocols. The MAX3171/MAX3173 transceivers carry the serial interface control signaling; the MAX3170 transceivers carry the clock and data signals. The MAX3172/MAX3174 have an extra transceiver for applications requiring four transceivers for control signaling.

An internal charge pump and proprietary low-dropout transmitter output stage allow V.28, V.11, and V.10 compliant operation from a single +3.3V supply. A no-cable mode is entered when all mode pins (M0, M1, and M2) are pulled high or left unconnected. In no-cable mode, supply current decreases to 2mA and all transmitter and receiver outputs are disabled (high impedance). Short-circuit limiting and thermal-shutdown circuits protect the drivers against excessive power dissipation.

The MAX3171 features 10µs deglitching on the V.10/V.11/V.28 receiver inputs. The MAX3173 is available for applications that do not require deglitching on the serial handshake signals. These parts require only four surface-mount capacitors for charge-pump operation in addition to supply bypassing.

MAX3171, MAX3173: Typical Operating Circuit MAX3171, MAX3173: Typical Operating Circuit Enlarge+

Key Features

  • Industry's First +3.3V Multiprotocol Transceiver
  • Certified TBR-1 and TBR-2 Compliant (NET1 and NET2)
  • Supports V.28 (RS-232) and V.10/V.11 (RS-449, V.36, EIA-530, EIA-530-A, X.21, RS-423) Protocols
  • 3V/5V Logic Compatibility
  • Software-Selectable DCE/DTE-bar
  • True Fail-Safe Receiver Operation
  • Available in Small 28-Pin SSOP Package
  • 10µs Receiver Input Deglitching (MAX3171 only)
  • All Transmitter Outputs Fault Protected to ±15V, Tolerate Cable Miswiring
  • Applications/Uses

    • CSUs/DSUs
    • Data Networking
    • Data Routers
    • PCI Cards
    • Telecommunications
    Part NumberFunctionsRS-232 Data Rate
    RS-485 Data Rate
    Single Ended Tx/RxDiff. Tx/RxShutdnSupported ProtocolsDCE/ DTE Interchg.Rx Glitch RejectionTx Fault Protect.On Chip Charge PumpICC
    ICC (Shutdown)
    maxmaxmaxSee Notes
    MAX3171 Multiprotocol Control Transceiver0.24103/33/3Yes
    $6.96 @1k
    MAX3173 No
    See All Multiprotocol Transceivers (18)
    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.

    Quality and Environmental Data

    Product Reliability Reports: MAX3173.pdf 
    Lead-Free Package Tin (Sn) Whisker Reports

    CAD Symbols and Footprints

  • MAX3173CAI+
  • MAX3173CAI+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.

    Quality Management System >
    Environmental Management System >


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