ADM3485EARZREEL Analog Devices, ADM3485EARZREEL Datasheet

ADM3485EARZREEL

Manufacturer Part Number

ADM3485EARZREEL

Description

SOP

Manufacturer

Analog Devices

Datasheet

1.ADM3485EARZREEL.pdf (16 pages)

Specifications of ADM3485EARZREEL

Date_code

08+

Current page: 1 of 16
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FEATURES

Operates with 3.3 V supply

ESD protection: 8 kV meets IEC1000-4-2

EFT protection: 2 kV meets IEC1000-4-4

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

1 mA supply current

2 nA shutdown current

8 ns skew

APPLICATIONS

Telecommunications

DTE-DCE interfaces

Packet switching

Local area networks

Data concentration

Data multiplexers

Integrated services digital network (ISDN)

AppleTalk

Industrial controls

GENERAL DESCRIPTION

The ADM3485E is a low power, differential line transceiver

that operates with a single 3.3 V power supply. Low power

consumption makes it ideal for power-sensitive applications.

It is suitable for communication on multipoint bus transmission

lines. Internal protection against electrostatic discharge (ESD)

and electrical fast transient (EFT) allows operation in electri-

cally harsh environments.

It is intended for balanced data transmission and complies

with both EIA Standards RS-485 and RS-422. It contains a

differential line driver and a differential line receiver, and is

suitable for half-duplex data transfer.

The input impedance is 19 kΩ following up to 50 transceivers to

be connected on the bus.

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

ESD-Protected, EMC-Compliant, 3.3 V

20 Mbps, EIA RS-485 Transceiver

Excessive power dissipation caused by bus contention or by

output shorting is prevented by a thermal shutdown circuit.

This feature forces the driver output into a high impedance state

if, during fault conditions, a significant temperature increase is

detected in the internal driver circuitry.

The receiver contains a fail-safe feature that results in a logic

high output state if the inputs are unconnected (floating).

The device is fabricated on BiCMOS, an advanced mixed

technology process combining low power CMOS with fast

switching bipolar technology.

The ADM3485E is fully specified over the industrial temper-

ature range and is available in 8-lead PDIP and SOIC packages.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

FUNCTIONAL BLOCK DIAGRAM

ADM3485E

Figure 1.

ADM3485E

www.analog.com

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