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5 V, ±15 kV ESD Protected

Half-Duplex, RS-485/RS-422 Transceivers

ADM485E/ADM487E/ADM1487E

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.

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

Tel: 781.329.4700 www.analog.com

FEATURES

TIA/EIA RS-485/RS-422 compliant

ESD protection on RS-485 I/O pins

±15 kV human body model (HBM)

Data rates

ADM487E: 250 kbps

ADM485E/ADM1487E: 2.5 Mbps

Half-duplex

Reduced slew rates for low EMI

Common-mode input range: −7 V to +12 V

Thermal shutdown and short-circuit protection

8-lead SOIC packages

ADM487EW qualified for automotive applications

APPLICATIONS

Energy/power metering

Lighting systems

Industrial control

Telecommunications

Security systems

Instrumentation

FUNCTIONAL BLOCK DIAGRAM

GND

ADM485E/

ADM487E/

ADM1487E

06356-001

Figure 1.

GENERAL DESCRIPTION

The ADM485E/ADM487E/ADM1487E are 5 V, low power

data transceivers with ±15 kV ESD protection suitable for half-

duplex communication on multipoint bus transmission lines.

They are designed for balanced data transmission and comply

with Telecommunication Industry Association/Electronics

Industries Association (TIA/EIA) standards RS-485 and RS-422.

The ADM487E and ADM1487E have a 1/4 unit load receiver

input impedance that allows up to 128 transceivers on a bus,

whereas the ADM485E allows up to 32 transceivers on a bus.

Because only one driver is enabled at any time, the output of a

disabled or power-down driver is three-stated to avoid overloading

the bus.

The driver outputs are slew rate limited to reduce EMI and data

errors caused by reflections from improperly terminated buses.

Excessive power dissipation caused by bus contention or output

shorting is prevented with a thermal shutdown circuit.

The parts are fully specified over the industrial temperature

ranges and are available in 8-lead SOIC packages.

Table 1. Selection Table

Part

Number

Half-/Full-

Duplex

Guaranteed

Data Rate

(Mbps)

Slew Rate

Limited

Low Power

Shutdown

Driver/Receiver

Enable

Quiescent

Current (μA)

Number of

Nodes on Bus

Count

ADM485E Half 2.5 No No Yes 300 32 8

ADM487E Half 0.25 Yes Yes Yes 120 128 8

ADM1487E Half 2.5 No No Yes 230 128 8

ADM485E/ADM487E/ADM1487E

Rev. B | 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............................................................ 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

Typical Performance Characteristics ..............................................8

Test Circuits and Switching Characteristics................................ 11

Theory of Operation ...................................................................... 13

Circuit Description .................................................................... 13

Applications Information.............................................................. 15

Differential Data Transmission ................................................ 15

Cable and Data Rate................................................................... 15

Outline Dimensions ....................................................................... 16

Ordering Guide .......................................................................... 16

Automotive Products................................................................. 16

REVISION HISTORY

10/10—Rev. A to Rev. B

Added ADM487EW Qualified for Automotive Applications to

Features Section ................................................................................ 1

Updated Outline Dimensions....................................................... 16

Changes to Ordering Guide .......................................................... 16

Added Automotive Products Section .......................................... 16

3/08—Rev. 0 to Rev. A

Changes to Supply Voltage Range ....................................Universal

Added Endnote 1 .............................................................................. 3

Changes to Table 3............................................................................ 4

Changes to Table 4............................................................................ 5

Changes to Figure 12........................................................................ 9

Changes to Figure 27 and Table 9................................................. 14

Changes to Figure 29...................................................................... 15

Updated Outline Dimensions....................................................... 16

1/07—Revision 0: Initial Version

ADM485E/ADM487E/ADM1487E

Rev. B | Page 3 of 16

SPECIFICATIONS

= 5 V ± 10%, T

= T

MIN

to T

MAX

, unless otherwise noted.

Table 2. ADM485E/ADM487E/ADM1487E

Parameter Symbol Min Typ Max Unit Test Conditions/Comments

DRIVER

Differential Outputs

Differential Output Voltage (No Load) V

OD1

5 V

OD2

2 V R

= 50 Ω (RS-422) Differential Output Voltage (with Load)

1.5 5 V R

= 27 Ω (RS-485) (see Figure 18)

Δ |V

| for Complementary Output States 0.2 V R

= 27 Ω or 50 Ω (see Figure 18)

Common-Mode Output Voltage V

3 V R

= 27 Ω or 50 Ω (see Figure 18)

Δ |V

| for Complementary Output States 0.2 V R

= 27 Ω or 50 Ω (see Figure 18)

Logic Inputs

Input High Voltage V

2.0 V

DE, DI, RE

Input Low Voltage V

0.8 V

DE, DI, RE

Logic Input Current

IN1

±2 μA

DE, DI, RE

RECEIVER

IN2

1.0 mA DE = 0 V, V

= 12 V

−0.8 mA V

= 0 V or 5.25 V, V

= −7 V (ADM485E)

0.25 mA DE = 0 V, V

= 12 V

Input Current (A, B)

−0.2 mA

= 0 V or 5.25 V, V

= −7 V

(ADM487E/ADM1487E)

Differential Inputs

Differential Input Threshold Voltage V

−0.2 +0.2 V −7 V < V

< +12 V

Input Hysteresis ΔV

70 mV V

= 0 V

Receiver Output Logic

Output Voltage High V

3.5 V I

OUT

= −4 mA, V

= +200 mV

Output Voltage Low V

0.4 V I

OUT

= +4 mA, V

= −200 mV

Three-State Output Leakage Current I

OZR

±1 μA 0.4 V < V

< 2.4 V

12 kΩ −7 V < V

< +12 V (ADM485E) Receiver Input Resistance

48 kΩ −7 V < V

< +12 V (ADM487E/ADM1487E)

POWER SUPPLY

500 900 μA

= 0 V or V

, DE = V

(ADM485E)

300 500 μA

= 0 V or V

, DE = 0 V (ADM485E)

300 500 μA

= 0 V or V

, DE = V

(ADM1487E)

230 400 μA

= 0 V or V

, DE = 0 V (ADM1487E)

250 400 μA

= 0 V or V

, DE = V

(ADM487E)

No Load Supply Current

120 250 μA

= 0 V, DE = 0 V (ADM487E)

Supply Current in Shutdown I

SHDN

0.5 10 μA

DE = 0 V, RE

= V

(ADM487E)

Driver Short-Circuit Current, V

High I

OSD1

35 250 mA −7 V ≤ V

≤ +12 V, applies to peak current

Driver Short-Circuit Current, V

Low I

OSD2

35 250 mA −7 V ≤ V

≤ +12 V, applies to peak current

Receiver Short-Circuit Current I

OSR

7 95 mA 0 V ≤ V

≤ V

ESD PROTECTION

A, B ±15 kV Human body model

Supply voltage is 5 V ± 5%.

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