2.5V, ±15kV ESD-Protected RS-232 Transceivers for PDAs and Cell Phones

+2.5V RS-232 Transceivers for PDA HotSync

Please check latest availability status for a specific part variant.


The MAX3388E/MAX3389E are 2.5V-powered EIA/TIA-232 and V.28/V.24 communications interfaces with low power requirements, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection. The MAX3388E/MAX3389E have two receivers and three transmitters. All RS-232 inputs and outputs are protected to ±15kV using the IEC 1000-4-2 Air-Gap Discharge method, ±8kV using the IEC 1000-4-2 Contact Discharge method, and ±15kV using the Human Body Model.

In addition to the traditional RS-232 I/O, these devices have dedicated logic-level I/O pins for additional device-to-device handshaking. During shutdown the logic-level I/O pins are active for the MAX3389E. An internal 62Ω switch is provided to switch power to external circuitry or modules.

A proprietary low-dropout transmitter output stage enables RS-232 compatible performance from a +2.35V to +3.0V supply with a dual charge pump. The charge pump requires only four small 0.1µF capacitors for operation from a +2.5V supply. The MAX3388E/MAX3389E are capable of running at data rates up to 460kbps while maintaining RS-232-compatible output levels.

The MAX3388E/MAX3389E have a unique VL pin that allows interoperation in mixed-logic voltage systems. Both input and output logic levels are pin programmable through the VL pin. The MAX3388E/MAX3389E are available in a space-saving TSSOP package.
MAX3388E, MAX3389E: Typical Operating Circuit MAX3388E, MAX3389E: Typical Operating Circuit Enlarge+

Key Features

  • VL Pin for Compatibility with Mixed-Voltage Systems
  • Additional I/O for Hot-Sync Applications
  • ±15kV ESD Protection on Rx Inputs, Tx Outputs, LIN, and SWIN
  • Low 300µA Supply Current
  • Guaranteed 460kbps Data Rate
  • 1µA Low-Power Shutdown
  • Integrated Switch for Powering Remote Circuitry
  • Flow-Through Pinout
  • LOUT Active During Shutdown (MAX3389E)


  • Battery-Powered Applications
  • Cellular Data Cables
  • Handheld Equipment
  • PDAs and PDA Cradles
  • Peripherals
  • Subnotebook and Palmtop Computers
Part NumberVSUPPLY
TxRxData Rate
Internal Charge PumpExt. CapsCap. Value
ESD Protect.
mintypnomSee Notes
$3.43 @1k
$4.95 @1k
See All RS-232 Line Driver/Receivers (136)
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.

CAD Symbols and Footprints

  • MAX3388ECUG+
  • MAX3388ECUG+T
  • MAX3388EEUG+
  • MAX3388EEUG+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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