An Introduction of MAX3485 Low-Power Transceivers

kate kate 20 December 2021 Follow
An Introduction of MAX3485 Low-Power Transceivers

General Description 

Devices in the MAX3483E family (MAX3483E/MAX3485E/ MAX3486E/MAX3488E/MAX3490E/MAX3491E) are ±15kV ESD-protected, +3.3V, low-power transceivers for
RS-485 and RS-422 communications. Each device contains one driver and one receiver. The MAX3483E and MAX3488E feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The partial y slew-rate-limited MAX3486E transmits up to 2.5Mbps. The MAX3485E, MAX3490E, and MAX3491E transmit at up to 12Mbps. 

All devices feature enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model. 

Drivers are short-circuited current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if both inputs are open circuits.
The MAX3488E, MAX3490E, and MAX3491E feature full-duplex communication, while the MAX3483E, MAX3485E, and MAX3486E are designed for half-duplex communication.


● ESD Protection for RS-485 I/O Pins 

• ±15kV—Human Body Model 


• ±8kV—IEC 1000-4-2, Contact Discharge 

• ±15kV—IEC 1000-4-2, Air-Gap Discharge 

● Operate from a Single +3.3V Supply—
No Charge Pump Required 

● Interoperable with +5V Logic 

● Guaranteed 12Mbps Data Rate

● Slew-Rate Limited for Errorless Data Transmission

● 2nA Low-Current Shutdown Mode

● -7V to +12V Common-Mode Input Voltage Range 

● Full-Duplex and Half-Duplex Versions Available 

● Industry-Standard 75176 Pinout

● Current-Limiting and Thermal Shutdown for
Driver Overload Protection


● Telecommunications 

● Industrial-Control Local Area Networks 

● Transceivers for EMI-Sensitive Applications 

● Integrated Services Digital Networks 

● Packet Switching

CAD Model

Pin Configuration






3D Model



  • Technical
  • Operating Temperature--40°C~85°C
  • Moisture Sensitivity Level (MSL)-1 (Unlimited)
  • Type-Transceiver
  • SubcategoryLine-Driver or Receivers
  • Max Power Dissipation-471mW
  • Technology-CMOS
  • Voltage - Supply-3V~3.6V
  • Peak Reflow Temperature (Cel)-260
  • Number of Functions-1
  • Supply Voltage-3.3V
  • Output Voltage-3V
  • Operating Supply Voltage-3.3V
  • Interface-RS-422, RS-485
  • Operating Supply Current-1.1mA
  • Output Current-20μA
  • Supply Current-Max-2.2mA
  • Output Low Current-Max0.0025A

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