MAX3237E 3-V To 5.5-V Single Channel RS-232 1 Mbit/s Line Driver/Receiver |


3-V To 5.5-V Single Channel RS-232 1 Mbit/s Line Driver/Receiver


Recommended alternative parts

  • TRS3237E  - The device is an EXACT EQUIVALENT in functionality and parametrics to the compared device. 


The MAX3237E consists of five line drivers, three 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. This device operates at data signaling rates of 250 kbit/s in normal operating mode (MBAUD = GND) and 1Mbit/s when MBAUD = VCC. The driver output slew rate is a maximum of 30 V/µs.

The MAX3237E transmitters are disabled and the outputs are forced into high-impedance state when the device is in shutdown mode (SHDN = GND) and the supply current falls to less than 1 µA. Also, during shutdown, the onboard charge pump is disabled; V+ is lowered to VCC, and V– is raised toward GND. Receiver outputs also can be placed in the high-impedance state by setting enable (EN) high. ROUT1B remains active all the time, regardless of the EN and SHDN condition.

The MAX3237EC is characterized for operation from 0°C to 70°C. The MAX3237EI is characterized for operation from –40°C to 85°C.


  • 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 From 250 kbits/s to 1 Mbit/s
  • Low Standby Current . . . 1 µA Typical
  • External Capacitors . . . 4 × 0.1 µF
  • Accepts 5-V Logic Input With 3.3-V Supply
  • Designed to Be Interchangeable With Maxim MAX3237E
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • ESD Protection for RS-232 I/O Pins
    • ±15 kV – Human-Body Model (HBM)
    • ±8 kV – IEC61000-4-2, Contact Discharge
    • ±15 kV – IEC61000-4-2, Air-Gap Discharge
    • Battery-Powered, Hand-Held, and Portable Equipment
    • PDAs and Palmtop PCs
    • Notebooks, Sub-Notebooks, and Laptops
    • Digital Cameras
    • Mobile Phones and Wireless Devices

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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
MAX3237E MAX3238
5     5    
3     3    
3.3     3.3    
1000     250    
  Auto-Powerdown Plus    
15     15    
Catalog     Catalog    
-40 to 85
0 to 70    
-40 to 85
0 to 70    
SOIC | 28
SSOP | 28
TSSOP | 28    
SSOP | 28
TSSOP | 28