adm485arm-reel7 Analog Devices, Inc., adm485arm-reel7 Datasheet

adm485arm-reel7

Manufacturer Part Number

adm485arm-reel7

Description

5 V Low Power Eia Rs-485 Transceiver

Manufacturer

Analog Devices, Inc.

Datasheet

1.ADM485ARM-REEL7.pdf (12 pages)

Current page: 1 of 12
Download datasheet (255Kb)

GENERAL DESCRIPTION

The ADM485 is a differential line transceiver suitable for high

speed bidirectional data communication on multipoint bus trans-

mission lines. It is designed for balanced data transmission and

complies with EIA Standards RS-485 and RS-422. The part

contains a differential line driver and a differential line receiver.

Both the driver and the receiver may be enabled independently.

When disabled, the outputs are three-stated.

The ADM485 operates from a single 5 V power supply. 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 condi-

tions a significant temperature increase is detected in the internal

driver circuitry.

Up to 32 transceivers may be connected simultaneously on a bus,

but only one driver should be enabled at any time. It is important,

therefore, that the remaining disabled drivers do not load the bus.

To ensure this, the ADM485 driver features high output imped-

ance when disabled and when powered down.

REV. E

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. 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.

FEATURES

Meets EIA RS-485 Standard

5 Mbps Data Rate

Single 5 V Supply

–7 V to +12 V Bus Common-Mode Range

High Speed, Low Power BiCMOS

Thermal Shutdown Protection

Short-Circuit Protection

Driver Propagation Delay: 10 ns

Receiver Propagation Delay: 15 ns

High Z Outputs with Power Off

Superior Upgrade for LTC485

APPLICATIONS

Low Power RS-485 Systems

DTE-DCE Interface

Packet Switching

Local Area Networks

Data Concentration

Data Multiplexers

Integrated Services Digital Network (ISDN)

This minimizes the loading effect when the transceiver is not being

used. The high impedance driver output is maintained over the

entire common-mode voltage range from –7 V to +12 V.

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

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

The ADM485 is fabricated on BiCMOS, an advanced mixed

technology process combining low power CMOS with fast switching

bipolar technology. All inputs and outputs contain protection

against ESD; all driver outputs feature high source and sink current

capability. An epitaxial layer is used to guard against latch-up.

The ADM485 features extremely fast switching speeds. Minimal

driver propagation delays permit transmission at data rates up to

5 Mbps while low skew minimizes EMI interference.

The part is fully specified over the commercial and industrial

temperature range and is available in PDIP, SOIC, and small

footprint MSOP 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

EIA RS-485 Transceiver

ADM485

5 V Low Power

ADM485

GND

www.analog.com

Related parts for adm485arm-reel7

adm485arm-reel7 Summary of contents

Page 1

... The part is fully specified over the commercial and industrial temperature range and is available in PDIP, SOIC, and small footprint MSOP packages. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. ADM485 GND www ...

Page 2

ADM485–SPECIFICATIONS Parameter DRIVER Differential Output Voltage OD3 ∆|V | for Complementary Output States OD Common-Mode Output Voltage ∆|V | for Complementary Output States OD Output Short-Circuit Current (V OUT Output Short-Circuit Current (V OUT CMOS ...

Page 3

... Exposure to absolute maximum ratings for extended periods of time may affect device reliability. Model ADM485AN ADM485AR ADM485AR-REEL ADM485ARZ* ADM485ARZ-REEL* ADM485ARM ADM485ARM-REEL ADM485ARM-REEL7 ADM485JN ADM485JR ADM485JR-REEL ADM485JR-REEL7 ADM485JRZ* ADM485JRZ-REEL* ADM485JRZ-REEL7 Lead Free. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection ...

Page 4

ADM485 Pin No. Mnemonic Function 1 RO Receiver Output. When enabled > 200 mV, then RO = High < 200 mV, then RO = Low Receiver Output Enable. A low ...

Page 5

Test Circuits V OD Test Circuit 1. Driver Voltage Measurement V 60 OD3 Test Circuit 2. Driver Voltage Measurement A R LDIFF B Test Circuit 3. Driver Propagation Delay Switching Characteristics 3V 1. PLH B 1/2VO V O ...

Page 6

ADM485–Typical Performance Characteristics 0.25 0.50 0.75 1.00 1.25 OUTPUT VOLTAGE – V TPC 1. Output Current vs. Receiver Output Low Voltage 0 –2 –4 –6 –8 –10 –12 ...

Page 7

OUTPUT VOLTAGE – V TPC 7. Output Current vs. Driver Output Low Voltage 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 ...

Page 8

ADM485 1, 2 TPC 13. Unloaded Driver Differential Outputs 1, 2 TPC 14. Loaded Driver Differential Outputs TPC 15. Driver/Receiver Propagation Delays Low to High TPC 16. Driver/Receiver Propagation Delays ...

Page 9

APPLICATION INFORMATION Differential Data Transmission Differential data transmission is used to reliably transmit data at high rates over long distances and through noisy environments. Differential transmission nullifies the effects of ground shifts and noise signals that appear as common-mode voltages ...

Page 10

ADM485 0.25 (0.0098) 0.10 (0.0040) COPLANARITY OUTLINE DIMENSIONS 8-Lead Standard Small Outline Package [SOIC] (R-8) Dimensions shown in millimeters and (inches) 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2440) 4.00 (0.1574) 5.80 (0.2284) 3.80 (0.1497 1.27 (0.0500) 1.75 ...

Page 11

REV. E OUTLINE DIMENSIONS 8-Lead Plastic Dual In-Line Package [PDIP] (N-8) Dimensions shown in inches and (millimeters) 0.375 (9.53) 0.365 (9.27) 0.355 (9.02 0.295 (7.49) 0.285 (7.24) 0.275 (6.98 0.325 ...

Page 12

ADM485 Revision History Location 10/03—Data Sheet changed from REV REV. E. Changes to TIMING SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . ...

Related keywords

adm485arm-reel7 datasheet
adm485arm-reel7 data sheet
adm485arm-reel7 pdf datasheet
adm485arm-reel7 component
adm485arm-reel7 part
adm485arm-reel7 distributor
adm485arm-reel7 RoHS
adm485arm-reel7 datasheet download