SLLS348O June   1999  – June 2015 MAX3221

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics - Power
    6. 6.6  Electrical Characteristics - Driver
    7. 6.7  Electrical Characteristics - Receiver
    8. 6.8  Electrical Characteristics - Status
    9. 6.9  Switching Characteristics - Driver
    10. 6.10 Switching Characteristics - Receiver
    11. 6.11 Switching Characteristics - Status
    12. 6.12 Typical Characteristics
  7. Parameter Measurement Information
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Power
      2. 8.3.2 RS232 Driver
      3. 8.3.3 RS232 Receiver
      4. 8.3.4 RS232 Status
    4. 8.4 Device Functional Modes
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Community Resources
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • DB|16
  • PW|16
散热焊盘机械数据 (封装 | 引脚)
订购信息

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

The MAX3221 line driver and receiver is a specialized device for 3-V to 5.5-V RS-232 communication applications. This application is a generic implementation of this device with all required external components. For proper operation, add capacitors as shown in Figure 8.

9.2 Typical Application

ROUT and DIN connect to UART or general purpose logic lines. FORCEON and FORCEOFF may be connected general purpose logic lines or tied to ground or VCC. INVALID may be connected to a general purpose logic line or left unconnected. RIN and DOUT lines connect to a RS232 connector or cable. DIN, FORCEON, and FORCEOFF inputs must not be left unconnected.

MAX3221 app_lls348.gifFigure 8. Typical Operating Circuit and Capacitor Values

9.2.1 Design Requirements

  • Recommended VCC is 3.3 V or 5 V.
    • 3 V to 5.5 V is also possible
  • Maximum recommended bit rate is 250 kbps.
  • Use capacitors as shown in Figure 8.

9.2.2 Detailed Design Procedure

  • DIN, FORCEOFF and FORCEON inputs must be connected to valid low or high logic levels.
  • Select capacitor values based on VCC level for best performance.

9.2.3 Application Curve

Curves for VCC of 3.3 V and 250 kbps alternative bit data stream.

MAX3221 C001_TIMING.pngFigure 9. 250-kbps Driver to Receiver Loopback Timing Waveform,
VCC= 3.3 V