±15 kV ESD-Protected, 3.3 V,12 Mbps,
EIA RS-485/RS-422 Transceiver
ADM3485E
Rev. D
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FEATURES
TIA/EIA RS-485/RS-422 compliant
±15 kV ESD protection on RS-485 input/output pins
12 Mbps data rate
Half-duplex transceiver
Up to 32 nodes on the bus
Receiver open-circuit, fail-safe design
Low power shutdown current
Outputs high-Z when disabled or powered off
Common-mode input range: −7 V to +12 V
Thermal shutdown and short-circuit protection
Industry-standard 75176 pinout
8-lead narrow SOIC package
APPLICATIONS
Power/energy metering
Telecommunications
EMI-sensitive systems
Industrial control
Local area networks
FUNCTIONAL BLOCK DIAGRAM
ADM3485E
RO
RE
DE
DI
B
A
R
D
03338-001
Figure 1.
GENERAL DESCRIPTION
The ADM3485E is a 3.3 V, low power data transceiver with
±15 kV ESD protection, suitable for half-duplex communi-
cation on multipoint bus transmission lines. The ADM3485E
is designed for balanced data transmission and complies with
TIA/EIA standards RS485 and RS-422. The ADM3485E is a
half-duplex transceiver that shares differential lines and has
separate enable inputs for the driver and the receiver.
The devices have a 12 kΩ receiver input impedance, which
allows up to 32 transceivers on a bus. Because only one driver
should be enabled at any time, the output of a disabled or
powered-down driver is tristated to avoid overloading the bus.
The receiver has a fail-safe feature that ensures a logic high
output when the inputs are floating. Excessive power dissipation
caused by bus contention or by output shorting is prevented
with a thermal shutdown circuit.
The part is fully specified over the industrial temperature range
and is available in an 8-lead narrow SOIC package.
ADM3485E* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
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EVALUATION KITS
Standard RS-485 Half-Duplex Evaluation Board, EVAL-
RS485HDEBZ
DOCUMENTATION
Application Notes
AN-1161: EMC-Compliant RS-485 Communication
Networks
AN-1176: Component Footprints and Symbols in the
Binary .Bxl File Format
AN-960: RS-485/RS-422 Circuit Implementation Guide
Data Sheet
ADM3485E: 15 kV ESD-Protected, 3.3 V,12 Mbps, EIA
RS-485/RS-422 Transceiver Data Sheet
SOFTWARE AND SYSTEMS REQUIREMENTS
ADI RS-485/RS-422 Cross Reference Guide
RS-232 Transceivers Cross Reference Guide
TOOLS AND SIMULATIONS
ADM3485E IBIS Model
REFERENCE DESIGNS
CN0313
REFERENCE MATERIALS
Solutions Bulletins & Brochures
Emerging Energy Applications Solutions Bulletin, Volume
10, Issue 4
Test & Instrumentation Solutions Bulletin, Volume 10,
Issue 3
Technical Articles
Safeguard Your RS485 Communication Networks from
Harmful EMC Events
DESIGN RESOURCES
ADM3485E Material Declaration
PCN-PDN Information
Quality And Reliability
Symbols and Footprints
DISCUSSIONS
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SAMPLE AND BUY
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TECHNICAL SUPPORT
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number.
DOCUMENT FEEDBACK
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ADM3485E
Rev. D | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Specifications ....................................................................... 4
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configuration and Pin Function Descriptions ...................... 6
Test Circuits and Switching Characteristics ...................................7
Typical Performance Characteristics ..............................................9
Standards and Testing .................................................................... 11
ESD Testing ................................................................................. 11
Applications Information .............................................................. 12
Differential Data Transmission ................................................ 12
Cable and Data Rate ................................................................... 12
Receiver Open-Circuit Fail-Safe ............................................... 12
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 13
REVISION HISTORY
8/10—Rev. C to Rev. D
Changes to Table 1, Driver, Logic Inputs ...................................... 3
12/06—Rev. B to Rev. C
Updated Format .................................................................. Universal
Removed PDIP Model ....................................................... Universal
Changes to Features, Applications, and General Description .... 1
Changes to Specifications ................................................................ 3
Changes to Timing Specifications .................................................. 4
Changes to Absolute Maximum Ratings ....................................... 5
Reorganized Test Circuits and Switching
Characteristics Section ..................................................................... 7
Replaced Figure 3 to Figure 11 ....................................................... 7
Deleted Figure 12 to Figure 14 ........................................................ 8
Changes to Figure 15 to Figure 20 .................................................. 9
Changes to Figure 21 and Figure 22 ............................................. 10
Changes to Table 9 .......................................................................... 11
Deleted Figure 24 ............................................................................ 11
Removed Fast Transient Burst Immunity
(IEC1000-4-4) Section ................................................................... 12
Updated Outline Dimensions ....................................................... 13
Changes to Ordering Guide .......................................................... 13
10/04—Rev. A to Rev. B
Updated Format .................................................................. Universal
Changes to Power-Supply Current, Table 1 .................................. 3
Updated Outline Dimensions ....................................................... 14
Changes to Ordering Guide .......................................................... 14
5/00—Rev. 0 to Rev. A

ADM3485EARZ-REEL7

Mfr. #:
Manufacturer:
Analog Devices Inc.
Description:
RS-422/RS-485 Interface IC 3.3V 15kV ESD Half Duplex 12Mbps
Lifecycle:
New from this manufacturer.
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