• MAX3221CDBR SSOP (DB)-16


250kbps data rate


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Overview of MAX3221CDBR

The MAX3221CDBR is a single-channel RS-232 driver/receiver IC designed for serial communication applications.It features a data rate of up to 230kbps and low-power shutdown mode,making it suitable for a wide range of communication systems.


(Note:The pin configuration below is a general representation.Refer to the specific datasheet for precise details.)

  • V+ : Positive Power Supply
  • V- : Negative Power Supply
  • T1IN : Input for Channel 1 Transmitter
  • T1OUT : Output for Channel 1 Transmitter
  • R1OUT : Output for Channel 1 Receiver
  • R1IN : Input for Channel 1 Receiver
  • SHDN : Shutdown Pin
  • GND : Ground
  • C1+, C1- : External Capacitor Connections

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the MAX3221CDBR IC for a visual representation.

Key Features

  • Single-Channel RS-232 Driver/Receiver: Provides a single channel for reliable serial communication.
  • Data Rate: Supports data rates up to 230kbps, enabling high-speed communication.
  • Low-Power Shutdown Mode: Features a low-power shutdown mode for power-saving applications.
  • Wide Operating Voltage Range: Operates from a single +3.0V to +5.5V supply, ensuring compatibility with various systems.
  • ESD Protection: Includes ±15kV ESD protection on the RS-232 pins for robust operation.
  • Compact Package: Available in a compact 24-pin SSOP package for space-constrained applications.

Note: For detailed technical specifications, please refer to the MAX3221CDBR datasheet.


  • Serial Communication Systems: Ideal for use in serial communication systems requiring RS-232 compatibility.
  • Data Logging: Suitable for data logging applications where reliable communication is essential.
  • Embedded Systems: Used in embedded systems for interfacing with RS-232 devices.


The MAX3221CDBR is a single-channel RS-232 driver/receiver IC that facilitates the conversion between TTL/CMOS logic levels and RS-232 voltage levels.It provides a reliable and efficient communication link between microcontrollers and RS-232 devices.

Usage Guide

  • Power Supply: Connect V+ (Pin 1) and V- (Pin 2) to the positive and negative power supplies respectively.
  • Data Connections: Connect the T1IN/T1OUT and R1IN/R1OUT pins to the respective transmitter and receiver lines.
  • Shutdown Control: Use the SHDN (Pin 6) pin to enable or disable the low-power shutdown mode as needed.

Frequently Asked Questions

Q: Can the MAX3221CDBR operate at higher data rates?
A: The MAX3221CDBR is designed to operate at data rates up to 230kbps.For higher data rates, consider using alternative devices with faster speed capabilities.

Q: Is the MAX3221CDBR suitable for low-power applications?
A: Yes, the MAX3221CDBR features a low-power shutdown mode,making it suitable for applications where power efficiency is crucial.


For similar functionalities, consider these alternatives to the MAX3221CDBR:

  • MAX3232ECDR: A similar IC from Maxim Integrated that offers comparable functionality with slight variations in specifications.
  • SP3232EEN-L/TR: This RS-232 transceiver IC from Exar Corporation provides similar performance characteristics and compatibility with the MAX3221CDBR.


The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Drivers per package 1 Receivers per package 1
Logic voltage (min) (V) 3.3 Data rate (max) (MBps) 0.25
Main supply voltage (nom) (V) 3.3, 5 Features Auto-Powerdown
ESD HBM (kV) 15 Rating Catalog
Operating temperature range (°C) -40 to 85, 0 to 70 Vout (typ) (V) 5.4

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