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

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DB|16
  • PW|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • RS-232 Bus-Pin ESD Protection Exceeds
    ±15 kV Using Human Body Model (HBM)
  • Meets or Exceeds the Requirements of
    TIA/EIA-232-F and ITU V.28 Standards
  • Operates With 3-V to 5.5-V VCC Supply
  • Operates up to 250 kbps
  • One Driver and One Receiver
  • Low Standby Current: 1 μA Typical
  • External Capacitors: 4 × 0.1 μF
  • Accepts 5-V Logic Input With 3.3-V Supply
  • Alternative High-Speed Pin-Compatible
    Device (1 Mbps)
    • SNx5C3221
  • Automatic Power-Down Feature Automatically Disables Drivers for Power Savings

2 Applications

  • Battery-Powered, Hand-Held, and Portable Equipment
  • Notebooks, Subnotebooks, and Laptops
  • Digital Cameras
  • Mobile Phones and Wireless Devices

3 Description

The MAX3221 device consists of one line driver, one line receiver with dedicated enable pin, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. These devices operate at data signaling rates up to 250 kbps and a maximum of 30-V/μs driver output slew rate.

Flexible control options for power management are available when the serial port is inactive. The automatic power-down feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid
RS-232 signal on the receiver input, the driver output is disabled and the supply current is reduced to 1 μA. The INVALID output notifies the user if an RS-232 signal is present at the receiver input.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
MAX3221xDB SSOP (32) 6.20 mm × 5.30 mm
MAX3221xPW TSSOP (32) 5.00 mm × 4.40 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Diagram

MAX3221 key_graphic_lls814.gif