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3.0V to 5.5V, Low-Power, Up to 1Mbps, True RS-232 Transceivers

Product Details

The MAX3222/MAX3232/MAX3237/MAX3241 transceivers have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in normal operating mode and 1Mbps in the MegaBaud™ operating mode.

The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222 and MAX3232 are pin, package, and functionally compatible with the industry-standard MAX242 and MAX232, respectively.

The MAX3241 has 5 receivers and 3 drivers, while the MAX3237 has 3 receivers and 5 drivers. Receivers R1 (MAX3237/MAX3241) and R2 (MAX3241) have extra outputs in addition to their standard outputs. These extra outputs are always active, allowing external devices to be monitored without forward biasing the protection diodes in circuitry that may have VCC completely removed.

The MAX3222, MAX3232, and MAX3241 are available in space-saving TSSOP and SSOP packages with operating temperatures of either -40°C to +85°C or 0°C to 70°C.

Key Features

  • Integrated Features Saves Board Space and Simplifies Design
    • Charge Pump Circuitry Eliminates the Need for a Bipolar ±12V Supply
    • Wide Single-Supply Operation From +3V to +5.5V Supply
    • Always-On Extra Outputs Enable Monitoring of External Devices
  • Power Saving Extends Battery Life
    • 1µA Supply Current in Shutdown Mode While Receiver is Active (MAX3222, MAX3237, MAX3241)

Applications/Uses

  • Battery-Powered Equipment
  • Handheld Equipment
  • High-Speed Modems
  • Notebook, Subnotebook, and Palmtop Computers
  • Peripherals
  • Printers
Parametric specs for RS-232 Line Driver/Receivers
# Rx 2
# Tx 2
VSUPPLY (V) 5
Data Rate (kbps) (min) 120
ICC (mA) (typ) 0.3
Internal Charge Pump Yes
External Caps 4
Cap. Value (µF) (nom) 0.1
Package/Pins PDIP/16
SOIC (N)/16
SOIC (W)/16
SSOP/16
TSSOP/16
Budgetary
Price (See Notes)
$2.69 @1k
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Simplified Block Diagram

MAX3222, MAX3232, MAX3237, MAX3241: Typical Operating Circuits MAX3222, MAX3232, MAX3237, MAX3241: Typical Operating Circuits Zoom icon

Design & Development

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Description

Maxim Analog Essentials is a collection of peripheral modules which can plug directly into any FPGA/CPU expansion port which follows the Pmod™ standard established by Digilent, Inc. The collection includes modules containing a wide variety of commonly used analog and mixed signal functions. The modules are supported by software which includes FPGA configuration files for three popular FPGA platforms: Avnet LX-9, Digilent Nexys 3 and Avnet ZEDBoard, as well as example programs to exercise and demonstrate each module. While the example programs demonstrate the module’s functionality, they are well partitioned and documented allowing the core routines to be easily cut and pasted into your own programs. The combination of plug-in simplicity and easy software integration allows for quick migration from idea to working prototype.

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Features

  • Data Converter, Interface, Clock, Sensor, and Other Modules Included to Address Many Design Needs
  • Plug in Modules Enable Rapid Hardware Prototyping
  • Proven Software Drivers Reduce Development Time
  • FPGA Configuration Files Included to Simplify Design Effort

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Support & Training

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Parameters

Parametric specs for RS-232 Line Driver/Receivers
# Rx 2
# Tx 2
VSUPPLY (V) 5
Data Rate (kbps) (min) 120
ICC (mA) (typ) 0.3
Internal Charge Pump Yes
External Caps 4
Cap. Value (µF) (nom) 0.1
Package/Pins PDIP/16
SOIC (N)/16
SOIC (W)/16
SSOP/16
TSSOP/16
Budgetary
Price (See Notes)
$2.69 @1k

Key Features

  • Integrated Features Saves Board Space and Simplifies Design
    • Charge Pump Circuitry Eliminates the Need for a Bipolar ±12V Supply
    • Wide Single-Supply Operation From +3V to +5.5V Supply
    • Always-On Extra Outputs Enable Monitoring of External Devices
  • Power Saving Extends Battery Life
    • 1µA Supply Current in Shutdown Mode While Receiver is Active (MAX3222, MAX3237, MAX3241)

Applications/Uses

  • Battery-Powered Equipment
  • Handheld Equipment
  • High-Speed Modems
  • Notebook, Subnotebook, and Palmtop Computers
  • Peripherals
  • Printers

Description

The MAX3222/MAX3232/MAX3237/MAX3241 transceivers have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in normal operating mode and 1Mbps in the MegaBaud™ operating mode.

The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222 and MAX3232 are pin, package, and functionally compatible with the industry-standard MAX242 and MAX232, respectively.

The MAX3241 has 5 receivers and 3 drivers, while the MAX3237 has 3 receivers and 5 drivers. Receivers R1 (MAX3237/MAX3241) and R2 (MAX3241) have extra outputs in addition to their standard outputs. These extra outputs are always active, allowing external devices to be monitored without forward biasing the protection diodes in circuitry that may have VCC completely removed.

The MAX3222, MAX3232, and MAX3241 are available in space-saving TSSOP and SSOP packages with operating temperatures of either -40°C to +85°C or 0°C to 70°C.

Simplified Block Diagram

MAX3222, MAX3232, MAX3237, MAX3241: Typical Operating Circuits MAX3222, MAX3232, MAX3237, MAX3241: Typical Operating Circuits Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal