ADM3491-1
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ADM3491-1

3.3V, Full Duplex, 840uA, 20Mbps, EIA RS-485 Transceiver

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Features
  • Operates with 3.3 V supply
  • EIA RS-422 and RS-485 compliant over full CM range
  • 19 kΩ input impedance
  • Up to 50 transceivers on bus
  • 20 Mbps data rate
  • Short-circuit protection
  • Specified over full temperature range
  • Thermal shutdown
  • Interoperable with 5 V logic
  • 840 μA supply current
  • 2 nA shutdown current
  • See data sheet for additional features
Additional Details
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The ADM3491-1 is a low power, differential line transceiver designed to operate using a single 3.3 V power supply. Low power consumption, coupled with a shutdown mode, makes it ideal for power-sensitive applications. It is suitable for communication on multipoint bus transmission lines.

The ADM3491-1 is intended for balanced data transmission and complies with both Electronic Industries Association (EIA) Standards RS-485 and RS-422. It contains a differential line driver and a differential line receiver, making it suitable for full-duplex data transfer.

The input impedance is 19 kΩ, allowing up to 50 transceivers to be connected on the bus. A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting. This feature forces the driver output into a high impedance state if a significant temperature increase is detected in the internal driver circuitry during fault conditions.

If the inputs are unconnected (floating), the receiver contains a fail-safe feature that results in a logic high output state.

The ADM3491-1 is fabricated on BiCMOS, an advanced mixed technology process combining low power CMOS with fast switching bipolar technology.

APPLICATIONS

  • Telecommunications
  • DTE–DCE interface
  • Packet switching
  • Local area networks
  • Data concentration
  • Data multiplexers
  • Integrated services digital network (ISDN)
  • AppleTalk Industrial controls
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Part Models 6
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ADM3491-1

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Data Sheet

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UPDATED 06/24/2014
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ADM3491-1: 3.3 V, Full-Duplex, 840 μA, 20 Mbps, EIA RS-485 Transceiver Data Sheet (Rev.C)

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Application Note

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UPDATED 07/09/2020
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AN-960: RS-485/RS-422 Circuit Implementation Guide redirect icon

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UPDATED 07/09/2020
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AN-960：RS-485/RS-422电路实施指南 redirect icon

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UPDATED 07/09/2020
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AN-960: RS-485/RS-422 回路の実装ガイド redirect icon

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Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
ADM3491ARUZ-1 16-Lead TSSOP external-link
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ADM3491ARUZ-1REEL 16-Lead TSSOP external-link
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ADM3491ARUZ-1REEL7 16-Lead TSSOP external-link
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ADM3491ARZ-1 14-Lead SOIC external-link
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ADM3491ARZ-1REEL 14-Lead SOIC external-link
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ADM3491ARZ-1REEL7 14-Lead SOIC external-link
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PCN

Jan 16, 2012

- 11_0244

Halogen Free Material Change for Select TSSOP Products Assembled at Amkor

ADM3491ARUZ-1

ADM3491ARUZ-1REEL

ADM3491ARUZ-1REEL7

pdf

PCN11_0244_Form

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xls

Material_Report

Download

pdf

Qualification Report Summary

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Feb 3, 2009

- 08_0001

Qualification of 8" 3um BiCMOS wafer fab process at Analog Devices, Limerick, Ireland.

ADM3491ARUZ-1

ADM3491ARUZ-1REEL

ADM3491ARUZ-1REEL7

ADM3491ARZ-1

ADM3491ARZ-1REEL

ADM3491ARZ-1REEL7

pdf

Form

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xls

Material_Report

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pdf

RQR04496B

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pdf

RQR04497E

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Mar 25, 2021

- 21_0080

Amkor Philippines as an Alternate Site for SOICN

ADM3491ARZ-1

ADM3491ARZ-1REEL

ADM3491ARZ-1REEL7

pdf

PCN21_0080_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

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pdf

Other

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Oct 5, 2010

- 10_0146

Halogen Free Material Change for 14/16L SOIC_N Products

ADM3491ARZ-1

ADM3491ARZ-1REEL

ADM3491ARZ-1REEL7

pdf

PCN10_0146_Form

external-icon

xls

Material_Report

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AEC-Q100 Reliability Report

ADI0012 Reliability Report

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Part Models

Product Lifecycle

PCN

Jan 16, 2012

- 11_0244

arrow down

Halogen Free Material Change for Select TSSOP Products Assembled at Amkor

ADM3491ARUZ-1

ADM3491ARUZ-1REEL

ADM3491ARUZ-1REEL7

pdf

PCN11_0244_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Report Summary

external-icon
Feb 3, 2009

- 08_0001

arrow down

Qualification of 8" 3um BiCMOS wafer fab process at Analog Devices, Limerick, Ireland.

ADM3491ARUZ-1

ADM3491ARUZ-1REEL

ADM3491ARUZ-1REEL7

ADM3491ARZ-1

ADM3491ARZ-1REEL

ADM3491ARZ-1REEL7

pdf

Form

external-icon

xls

Material_Report

Download

pdf

RQR04496B

external-icon

pdf

RQR04497E

external-icon
Mar 25, 2021

- 21_0080

arrow down

Amkor Philippines as an Alternate Site for SOICN

ADM3491ARZ-1

ADM3491ARZ-1REEL

ADM3491ARZ-1REEL7

pdf

PCN21_0080_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon

pdf

Other

external-icon
Oct 5, 2010

- 10_0146

arrow down

Halogen Free Material Change for 14/16L SOIC_N Products

ADM3491ARZ-1

ADM3491ARZ-1REEL

ADM3491ARZ-1REEL7

pdf

PCN10_0146_Form

external-icon

xls

Material_Report

Download
AEC-Q100 Reliability Report
ADI0012 Reliability Report

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