ADM3485E

PRODUCTION

3.3 V, ±15 kV ESD-Protected, RS-485/RS-422 Transceiver (Half Duplex, 12Mbps, DE/RE)

Data Sheet (Rev. D) Product Selection Table

Part Models: 3
1ku List Price: Starting From $1.47

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Overview

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

The ADM3485E is a 3.3 V, low power data transceiver with ±15 kV ESD protection, suitable for half-duplex communication on multipoint bus transmission lines. The ADM3485E is designed for balanced data transmission and complies with TIA/EIA standards RS485 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.

APPLICATIONS

Power/energy metering
Telecommunications
EMI-sensitive systems Industrial control
Local area networks

Part Models: 3
1ku List Price: Starting From $1.47

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
ADM3485EARZ	8-Lead SOIC	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
ADM3485EARZ-REEL	8-Lead SOIC	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
ADM3485EARZ-REEL7	8-Lead SOIC	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Sep 17, 2015 - 14_0129 RS-232 and RS-485/RS-422 Transceiver products alternate Fabrication foundry at ADI, Limerick, Ireland
		PCN14_0129_Form Material_Report Qualification Results Summary Detailed Change Description
ADM3485EARZ	PRODUCTION
ADM3485EARZ-REEL	PRODUCTION
ADM3485EARZ-REEL7	PRODUCTION
Dec 17, 2010 - 10_0256 Die Revision of ADM3485E
		PCN10_0256_Form Material_Report Reliability Report
ADM3485EARZ	PRODUCTION
ADM3485EARZ-REEL	PRODUCTION
ADM3485EARZ-REEL7	PRODUCTION
Feb 3, 2010 - 09_0256 Jiangsu Changjiang Electronics Technology Co. Ltd. (JCET), China as additional assembly and test sub-contractor for Narrow Body SOIC.
		Material Set Changes Material_Report PCN09_0256_Form Summary of Supporting data
ADM3485EARZ	PRODUCTION
ADM3485EARZ-REEL	PRODUCTION
ADM3485EARZ-REEL7	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
ADM3065E	PRODUCTION	3.0 V to 5.5 V, ±12 kV IEC ESD Protected, Half Duplex 50 Mbps RS-485 Transceiver

Tools & Simulations

ADM3485E IBIS Model 1

ADM3485E IBIS Model

Evaluation Kits

Standard RS-485 Half-Duplex Evaluation Board, EVAL-RS485HDEBZ

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Product Details

The EVAL-RS485HDEBZ allows quick and easy evaluation of half-duplex RS-485 transceivers with standard 8-lead SOIC footprints. The evaluation board allows interfacing via screw terminal block to digital I/O for driver input (DI), receiver output (RO), driver enable (DE) and receiver output (RO). Bus signals A and B (half-duplex bus) can be connected to a bus screw terminal block. One or two termination resistors can be connected to A and B via jumper settings, in order to evaluation the half-duplex RS-485 driver and receiver. Footprints are provided for pull-up and pull-down (biasing resistors) on the bus.

Devices for evaluation on the board must be ordered separately.