3V, Dual RS-232 Transceiver with LCD Supply and Contrast Controller

+3V RS-232 Transceiver Provides Power/Bias to LCD Display

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The MAX3325 integrates a two-transmitter, two-receiver RS-232 transceiver with an LCD supply plus temperature-compensated contrast control. It is intended for small 3V instruments requiring a 5V supply for either logic or an LCD display, an adjustable bias signal for contrast, LCD temperature compensation, and an RS-232 interface for serial communications.

The 5V supply is a regulated charge pump followed by a low-dropout (LDO) linear regulator capable of supplying 11mA for the 5V LCD power.

The MAX3325 has an internal 6-bit digital-to-analog converter (DAC) providing 64 contrast levels, plus an internal temperature sensor that compensates the LCD's contrast for changes in ambient temperature. The LCD contrast can be designed for any voltage range from -5V to +2V.

The MAX3325's 250kbps RS-232 transceiver meets all EIA-232E specifications with input voltages from +3.0V to +3.6V. Both the RS-232 section and the LCD supply circuitry can be independently placed in shutdown, tailoring power consumption for battery-powered equipment. The MAX3325 is available in 28-pin SSOP and narrow DIP packages.
MAX3325: Typical Operating Circuit MAX3325: Typical Operating Circuit Enlarge+

Key Features

  • +3.0V to +3.6V Single-Supply Operation
  • Provides 5.0V Regulated Output at 11mA in 3V Systems
  • 6-Bit DAC with Up/Down Interface for LCD Contrast Adjustment
  • Selectable Positive or Negative LCD Bias
  • Meets EIA-232E Specifications at 250kbps-Guaranteed
  • 1µA Shutdown Mode
  • Uses Small 0.22µF Capacitors-No Inductors Required
  • Temperature Sensor for LCD Contrast Compensation
  • Simple, Flexible Design Procedure for a Broad Range of LCD Displays


  • GPS Receivers
  • Handheld Medical Equipment
  • Handy Terminals
  • Industrial Test Equipment
  • PDAs and Palmtop Computers
Part NumberVSUPPLY
TxRxData Rate
Internal Charge PumpExt. CapsCap. Value
Rx Active in ShutdnPackage/PinsBudgetary
mintypnomSee Notes
MAX3325 3.3222502Yes40.222
$3.73 @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.

Quality and Environmental Data

Request Reliability Report for: MAX3325 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX3325EAI+
  • MAX3325EAI+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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