MAX3223 3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver |


3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver

3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver - MAX3223

Recommended alternative parts

  • TRS3223E  -  The device has the SAME FUNCTIONALITY/PINOUT as the compared device but includes enhanced IEC61000-4-2 ESD Protection.
  • MAX3223E  -  TI recommends the MAX3223E in new designs. The MAX3223E is an improved direct drop-in replacement for the MAX3223


The MAX3223 consists of two line drivers, two line receivers, 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. The device operates at data signaling rates up to 250 kbit/s 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 auto-powerdown 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, the driver outputs are disabled. If FORCEOFF\ is set low and EN\ is high, both drivers and receivers are shut off, and the supply current is reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drivers causes auto-powerdown to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF\ are high. With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to any receiver input. The INVALID\ output is used to notify the user if an RS-232 signal is present at any receiver input. INVALID\ is high (valid data) if any receiver input voltage is greater than 2.7 V or less than –2.7 V or has been between –0.3 V and 0.3 V for less than 30 µs. INVALID\ is low (invalid data) if the receiver input voltage is between –0.3 V and 0.3 V for more than 30 µs. Refer to Figure 4 for receiver input levels.


  • 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 kbit/s
  • Two Drivers and Two Receivers
  • 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 Mbit/s)
    • SNx5C3223
  • Applications
    • Battery-Powered Systems, PDAs, Notebooks, Laptops, Palmtop PCs, and Hand-Held Equipment

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Parametrics Compare all products in RS-232

Drivers Per Package
Receivers Per Package
Logic Voltage (Min) (V)
Data Rate (Max) (kbps)
Main Supply Voltage (Nom) (V)
Operating Temperature Range (C)
Package Group
MAX3223 MAX3227 TRS3221 TRS3227E
2     1     1     1    
2     1     1     1    
3.3     3.3     3.3     3.3    
250     1000     250     1000    
Auto-Powerdown     Auto-Powerdown Plus     Auto-Powerdown     Auto-Powerdown Plus    
15     15     15     15    
Catalog     Catalog     Catalog     Catalog    
-40 to 85
0 to 70    
-40 to 85
0 to 70    
-40 to 85
0 to 70    
0 to 70
-40 to 85    
SOIC | 20
SSOP | 20
TSSOP | 20    
SSOP | 16     SSOP | 16
TSSOP | 16    
SSOP | 16    
16SSOP     16SSOP