SLLS408H January   2000  – October 2016 MAX3222

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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: Device
    6. 6.6  Electrical Characteristics: Driver
    7. 6.7  Electrical Characteristics: Receiver
    8. 6.8  Switching Characteristics: Driver
    9. 6.9  Switching Characteristics: Receiver
    10. 6.10 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 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. 8.4 Device Functional Modes
  9. 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 Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

パッケージ・オプション

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ（パッケージ｜ピン）
  • DB|20
  • PW|20
  • DW|20
サーマルパッド・メカニカル・データ
発注情報

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 MAX3222 interfaces a universal asynchronous receiver / transmitter (UART) to RS-232 port voltage levels. External capacitors are used to generate RS-232 compliant voltages. 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. RIN and DOUT lines connect to a RS232 connector or cable.

MAX3222 typ_op_circit_and_capacitor_values_slls408.gif
C3 can be connected to VCC or GND.
Resistor values shown are nominal.
NC − No internal connection
Nonpolarized ceramic capacitors are acceptable. If polarized tantalum or electrolytic capacitors are used, they should be connected as shown.
Figure 8. Recommended Application Schematic

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 kbit/s.

Table 3. VCC vs Capacitor Values

VCC C1 C2, C3, and C4
3.3 V ± 0.3 V 0.1 µF 0.1 µF
5 V ± 0.5 V 0.047 µF 0.33 µF
3 V ± 5.5 V 0.1 µF 0.47 µF

9.2.2 Detailed Design Procedure

  • All DIN, PWRDOWN and EN 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 Curves

MAX3222 D004_MAX3222.gif Figure 9. Loopback Waveforms
VCC = 3.3 V, Data Rate 250 kbit/s
MAX3222 D003_MAX3222.gif Figure 10. Loopback Waveforms with 1-nF load
VCC = 3.3 V, Data Rate 250 kbit/s