Maxim > Products > Interface > MAX3483, MAX3485, MAX3486, ...

MAX3483, MAX3485, MAX3486, MAX3488, MAX3490, MAX3491

3.3V Powered, 10Mbps and Slew-Rate Limited, True RS-485/RS-422 Transceivers

 Overview   Design Resources   Ordering Info   Related Products   All   

Status Explanations for product status codes

Active: In Production.


The MAX3483, MAX3485, MAX3486, MAX3488, MAX3490, and MAX3491 are 3.3V, low-power transceivers for RS-485 and RS-422 communication. Each part contains one driver and one receiver. The MAX3483 and MAX3488 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 partially slew-rate-limited MAX3486 transmits up to 2.5Mbps. The MAX3485, MAX3490, and MAX3491 transmit at up to 10Mbps.

Drivers are short-circuit 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 circuit.

The MAX3488, MAX3490, and MAX3491 feature full-duplex communication, while the MAX3483, MAX3485, and MAX3486 are designed for half-duplex communication.

Data Sheet

Download this datasheet in PDF formatDownload Rev 0 (PDF, 208kB)
Send this datasheet to any email addressEmail

My Maxim: Not Logged In
By logging in to My Maxim you can subscribe to alerts for this data sheet.

Login | Register

Key Features

  • Operate from a Single 3.3V Supply-No Charge Pump!
  • Interoperable with +5V Logic
  • 8ns Max Skew (MAX3485/MAX3490/MAX3491)
  • Slew-Rate Limited for Errorless Data Transmission (MAX3483/MAX3488)
  • 2nA Low-Current Shutdown Mode (MAX3483/MAX3485/MAX3486/MAX3491)
  • -7V to +12V Common-Mode Input Voltage Range
  • Allows up to 32 Transceivers on the Bus
  • Full-Duplex and Half-Duplex Versions Available
  • Industry Standard 75176 Pinout (MAX3483/MAX3485/MAX3486)
  • Current-Limiting and Thermal Shutdown for Driver Overload Protection


  • Industrial Control Local Area Networks
  • Integrated Services Digital Networks
  • Low-Power RS-485/RS-422 Transceivers
  • Packet Switching
  • Telecommunications
  • Transceivers for EMI-Sensitive Applications

Key Specifications:

RS-422/485 Line Driver/Receivers
Part Number Tx/Rx Duplex VSUPPLY
Data Rate
Tx EN Rx EN ICC (Shutdn.)
Rx/Tx on Bus Budgetary
typ min typ See Notes
MAX3483  1Tx + 1Rx Half 3.3 1 250 Yes Yes 0.002 32 $1.97 @1k
MAX3485  Half 10000 Yes Yes 0.002
MAX3486  Half 2500 Yes Yes 0.002
MAX3488  Full 250 No No -
MAX3490  Full 10000 No No -
MAX3491  Full 10000 Yes Yes 0.002
See All RS-422/485 Line Driver/Receivers (171)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX3483, MAX3485, MAX3486: Typical Application Circuit
Typical Application Circuit

MAX3488, MAX3490: Typical Application Circuit
Typical Application Circuit

MAX3491: Typical Application Circuit
Typical Application Circuit

Notes and Comments

Slew-rate limiting reduces EMI and reflections (MAX3483)
Guaranteed 10Mbps data rate (MAX3485)
Guaranteed 2.5Mbps data rate (MAX3486)
Slew-rate limiting reduces EMI and reflections (MAX3488)
Guaranteed 10Mbps data rate (MAX3490)
MAX3490 plus driver/receiver enable (MAX3491)

More Information

RS-485 Resources

Didn't Find What You Need?

Information Index

Document Ref.: 19-0333 Rev 0; 1994-12-01
This page last modified: 2009-11-10