ADM3491ARU Analog Devices, ADM3491ARU Datasheet

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ADM3491ARU

Manufacturer Part Number
ADM3491ARU
Description
ADM3491ARU3.3 V, Full Duplex, 840 uA 20 Mbps, EIA RS-485 Transceiver
Manufacturer
Analog Devices
Datasheet

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GENERAL DESCRIPTION
The ADM3491 is a low power differential line transceiver
designed to operate using a single +3.3 V power supply. Low
power consumption coupled with a shutdown mode make it
ideal for power sensitive applications. It is suitable for commu-
nication on multipoint bus transmission lines.
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, making it suitable
for full duplex data transfer.
The input impedance is 19 k allowing up to 50 transceivers to
be connected on the bus.
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.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Operates with +3.3 V Supply
EIA RS-422 and RS-485 Compliant Over Full CM Range
19 k
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
840 A Supply Current
2 nA Shutdown Current
Also Available in TSSOP Package
Meets IEC1000-4-4 (>1 kV)
8 ns Skew
Upgrade for MAX 3491, SN75ALS180
APPLICATIONS
Telecommunications
DTE-DCE Interface
Packet Switching
Local Area Networks
Data Concentration
Data Multiplexers
Integrated Services Digital Network (ISDN)
AppleTalk
Industrial Controls
Input Impedance
20 Mbps, EIA RS-485 Transceiver
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
The receiver contains a fail-safe feature that results in a
logic high output state if the inputs are unconnected
(floating).
The ADM3491 is fabricated on BiCMOS, an advanced
mixed technology process combining low power CMOS
with fast switching bipolar technology.
The ADM3491 is fully specified over the industrial tem-
perature range and is available in DIP and SOIC packages
as well as a new space saving TSSOP package.
3.3 V, Full Duplex, 840 A
FUNCTIONAL BLOCK DIAGRAM
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World Wide Web Site: http://www.analog.com
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ADM3491
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© Analog Devices, Inc., 1998
ADM3491
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ADM3491ARU Summary of contents

Page 1

... REV. 0 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices ...

Page 2

ADM3491–SPECIFICATIONS Parameter DRIVER Differential Output Voltage for Complementary Output States OD Common-Mode Output Voltage 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

... Power Dissipation 14-Lead SOIC . . . . . . . . . . . . . . . 650 mW , Thermal Impedance . . . . . . . . . . . . . . . . . . . 115 C/W JA Model Temperature Range ADM3491AN – +85 C ADM3491AR – +85 C ADM3491ARU – +85 C Power Dissipation 16-Lead TSSOP . . . . . . . . . . . . . . 500 mW , Thermal Impedance . . . . . . . . . . . . . . . . . . . 158 C/W JA Operating Temperature Range Industrial (A Version – +85 C Storage Temperature Range . . . . . . . . . . . . – +150 Lead Temperature (Soldering, 10 sec) ...

Page 5

Mnemonic DIP/ Pin SOIC TSSOP 10, 13 GND ...

Page 6

ADM3491 Test Circuits Figure 1. Driver Voltage Measurement Test Circuit Figure 2. Driver Enable/Disable Test Circuit DIFF Figure 3. Driver Differential Output Delay Test Circuit C ...

Page 7

Switching Characteristics 3V 1. PLH Z 1/2VO SKEW VO 90% POINT 0V 10% POINT – Figure 9. Driver Propagation Delay, Rise/Fall Timing 0V A–B t PLH 1.5V RO Figure 10. Receiver Propagation Delay ...

Page 8

ADM3491 –Typical Performance Characteristics 0.5 1 1.5 2 OUTPUT VOLTAGE – Volts Figure 13. Receiver Output Low Voltage vs. Output Current 0.8 0.7 0.6 0 2.5mA 0.4 RO 0.3 ...

Page 9

TEMPERATURE – C Figure 19. Supply Current vs. Temperature [ CH1 1.00V CH2 1.00V M40.0ns CH3 CH3 2.00V CH4 2.00V ...

Page 10

ADM3491 +3. 0 RS-485/RS-422 LINK ADM3491 GND Figure 23. ADM3491 Full-Duplex Data Link Table I. Transmitting Truth ...

Page 11

APPLICATIONS 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 which appear as common-mode voltages ...

Page 12

ADM3491 14-Lead Plastic DIP (N-14) 0.795 (20.19) 0.725 (18.42 0.280 (7.11) 0.240 (6.10 0.060 (1.52) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) 0.160 (4.06) MIN 0.115 (2.93) SEATING 0.022 (0.558) 0.100 0.070 (1.77) PLANE ...

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