MAX3222 3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver |

MAX3222 (ACTIVE) 3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver


Recommended alternative parts

  • TRS3222E  -  The device has the SAME FUNCTIONALITY/PINOUT as the compared device but includes enhanced IEC61000-4-2 ESD Protection.
  • MAX3222E  -  TI recommends the MAX3222E in new designs. The MAX3222E is an improved direct drop-in replacement for the MAX3222
  • TRS3222  - The device is an EXACT EQUIVALENT in functionality and parametrics to the compared device. 


The MAX3222 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.

The MAX3222 can be placed in the power-down mode by setting PWRDOWN low, which draws only 1 μA from the power supply. When the device is powered down, the receivers remain active while the drivers are placed in the high-impedance state. Receiver outputs also can be placed in the high-impedance state by setting EN high.


  • 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
  • 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 Mbps)
    • SNx5C3222

All trademarks are the property of their respective owners.


Compare all products in RS-232 Email Download to Excel
Part number Order Drivers per package Receivers per package Logic voltage (Min) (V) Data rate (Max) (kbps) Main supply voltage (Nom) (V) Features ESD HBM (kV) Rating Operating temperature range (C) Package Group
MAX3222 Order now 2     2     3.3     250     3.3
Powerdown     15     Catalog     -40 to 85
0 to 70    
SOIC | 20
SSOP | 20
TSSOP | 20    
MAX3221 Order now 1     1     3.3     250     3.3
Auto-Powerdown     15     Catalog     -40 to 85
0 to 70    
SSOP | 16
TSSOP | 16