ADM3485EAN Analog Devices, ADM3485EAN Datasheet

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ADM3485EAN

Manufacturer Part Number
ADM3485EAN
Description
Manufacturer
Analog Devices
Datasheet
a
GENERAL DESCRIPTION
The ADM3485E is a low power differential line transceiver
designed to operate using a single +3.3 V power supply. Low
power consumption makes it ideal for power sensitive applica-
tions. It is suitable for communication on multipoint bus trans-
mission lines. Internal protection against electrostatic discharge
(ESD) and electrical fast transient (EFT) allows operation in
electrically harsh environments.
It is intended for balanced data transmission and complies with
both EIA Standards RS-485 and RS-422. It contains a differen-
tial line driver and a differential line receiver, and is suitable for
half duplex data transfer.
The input impedance is 19 kΩ allowing up to 50 transceivers to
be connected on the bus.
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 ADM3485E 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 tem-
perature range and is available in 8-lead DIP and SOIC
packages.
FUNCTIONAL BLOCK DIAGRAM
RO
RE
DE
DI
D
R
ADM3485E
ADM3485E
A
B

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ADM3485EAN Summary of contents

Page 1

GENERAL DESCRIPTION The ADM3485E is a low power differential line transceiver designed to operate using a single +3.3 V power supply. Low power consumption makes it ideal for power sensitive applica- tions suitable for communication on multipoint ...

Page 2

ADM3485E–SPECIFICATIONS Parameter DRIVER Differential Output Voltage ∆|V | for Complementary Output States OD Common-Mode Output Voltage V OC ∆|V | for Complementary Output States OC CMOS Input Logic Threshold Low, V CMOS Input Logic Threshold High, V Logic ...

Page 3

TIMING SPECIFICATIONS Parameter DRIVER Differential Output Delay T DD Differential Output Transition Time Propagation Delay Input to Output T Driver O/P to O/P T SKEW ENABLE/DISABLE Driver Enable to Output Valid Driver Disable Timing Driver Enable from Shutdown RECEIVER Time ...

Page 4

... Receiver Output . . . . . . . . . . . . . . . . . –0 Power Dissipation 8-Lead DIP . . . . . . . . . . . . . . . . . 800 mW θ , Thermal Impedance . . . . . . . . . . . . . . . . . . . . 140°C/W JA Power Dissipation 8-Lead SOIC . . . . . . . . . . . . . . . . 650 mW θ , Thermal Impedance . . . . . . . . . . . . . . . . . . . . 115°C/W JA Model Temperature Range ADM3485EAN –40°C to +85°C ADM3485EAR –40°C to +85°C Mnemonic DIP/ Pin SOIC Function RO 1 Receiver Output. High when A > ...

Page 5

Test Circuits R R DIFF DIFF OUT ...

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ADM3485E Switching Characteristics 3V 1.5V 1. PLH B 1 SKEW VO 90% POINT 0V 10% POINT – A–B t PLH 1. PLH D t SKEW 90% POINT D ...

Page 7

OUTPUT LOW VOLTAGE – V 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 –30 –50 – TEMPERATURE – C 120 100 80 ...

Page 8

ADM3485E 1.20 1.15 1.10 1. (mA 1.00 0.95 0.90 (mA LO 0.85 0.80 0.75 0.70 –30 –50 – TEMPERATURE – ...

Page 9

RL DL Table IV. ESD Test Results ESD Test Method I-O Pins ± IEC1000-4-2: Contact 100% 90% 10% 0.1 TO 1ns 30ns 60ns FAST TRANSIENT BURST IMMUNITY (IEC1000-4-4) IEC1000-4-4 (previously 801-4) covers ...

Page 10

ADM3485E Test results are classified according to the following 1. Normal performance within specification limits. 2. Temporary degradation or loss of performance that is self- recoverable. 3. Temporary degradation or loss of function or performance that requires operator intervention or ...

Page 11

OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.325 (8.25) 0.300 (7.62) 0.060 (1.52) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) 0.160 ...

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