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MAX1482, MAX1483

20µA, 1/8-Unit-Load, Slew-Rate-Limited, RS-485 Transceivers

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Active: In Production.

Description

The MAX1482 and MAX1483 are low-power transceivers for RS-485 and RS-422 communication. Both feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables. Data rates are guaranteed up to 250kbps.

The MAX1482/MAX1483 draw only 20µA of supply current. Additionally, they have a low-current shutdown mode that consumes only 0.1µA. Both parts operate from a single +5V supply.

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 the input is open circuit.
The MAX1482 is full duplex and the MAX1483 is half duplex. Both parts have a 1/8-unit-load input impedance that guarantees up to 256 transceivers on the bus.

Data Sheet

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Key Features

  • Low 20µA Operating Current
  • Slew-Rate Limited for Reduced EMI and Reduced Reflections
  • 0.1µA Low-Current Shutdown Mode
  • Designed for RS-485 and RS-422 Applications
  • Operate from a Single +5V Supply
  • -7V to +12V Common-Mode Input Voltage Range
  • Allows up to 256 Transceivers on the Bus—Guaranteed (1/8-unit load)
  • Current Limiting and Thermal Shutdown for Driver Overload Protection
 

Applications/Uses

  • Industrial Control Local Area Networks
  • Large 256-Node LANs
  • Low-Power RS-485/RS-422 Networks
  • Transceivers for EMI-Sensitive Applications
   

Key Specifications:

RS-422/485 Line Driver/Receivers
Part Number Tx/Rx Duplex VSUPPLY
(V)
ICC
(mA)
Data Rate
(kbps)
Tx EN Rx EN ICC (Shutdn.)
(µA)
Rx/Tx on Bus Budgetary
Price
typ min typ See Notes
MAX1482  1Tx + 1Rx Full 5 0.02 250 Yes Yes 0.1 256 $1.54 @1k
MAX1483  Half $1.49 @1k
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.



Diagram

MAX1482, MAX1483: Typical Operating Circuit
Typical Operating Circuit

Notes and Comments

1/8-unit load input impedance

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Information Index

Document Ref.: 19-0367 Rev 1; 2006-06-28
This page last modified: 2007-05-29