SLLS792C June   2007  – December 2024 TRS3221E

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  ESD Ratings, IEC Specifications
    4. 5.4  Recommended Operating Conditions
    5. 5.5  Thermal Information
    6. 5.6  Electrical Characteristics
    7. 5.7  Driver Section Electrical Characteristics
    8. 5.8  Driver Section Switching Characteristics
    9. 5.9  Receiver Section Electrical Characteristics
    10. 5.10 Receiver Section Switching Characteristics
    11. 5.11 Auto-Powerdown Section Electrical Characteristics
    12. 5.12 Auto-Powerdown Section Switching Characteristics
    13. 5.13 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Power
      2. 7.3.2 RS232 Driver
      3. 7.3.3 RS232 Receiver
      4. 7.3.4 RS232 Status
    4. 7.4 Device Functional Modes
  9. 8 Application Information Disclaimer
    1. 8.1 Application Information
    2. 8.2 Typical Application
    3. 8.3 Design Requirements
    4. 8.4 Detailed Design Procedure
    5. 8.5 Application Curve
    6.     Power Supply Recommendations
    7. 8.6 Layout
      1. 8.6.1 Layout Guidelines
      2. 8.6.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.1 Overview

The TRS3221E device is a one-driver and one-receiver RS-232 interface device. The RS-232 input and output are protected up to ±15kV using the Human-Body Model. The charge pump requires only four small 0.1μF capacitors for operation from a 3.3V supply. The TRS3221E device is capable of running at data rates up to 250kbps while maintaining RS-232-compliant output levels.

Automatic power down can be disabled when FORCEON and FORCEOFF are high. With automatic power down plus enabled, the device activates automatically when a valid signal is applied to any receiver input. The device can automatically power down the driver to save power when the RIN input is unpowered.

INVALID is high (valid data) if receiver input voltage is greater than 2.7V or less than –2.7V, or has been between –0.3V and 0.3V for less than 30μs. INVALID is low (invalid data) if receiver input voltages are between –0.3V and 0.3V for more than 30μs. Refer to Figure 6-5 for receiver input levels.