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ADM489ABRMZ-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Full-Duplex, Low Power,
Slew Rate Limited, EIA RS-485 Transceivers
Data Sheet
ADM488A/ADM489A
Rev. B Document Feedback
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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.
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Tel: 781.329.4700 ©2009-2014 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
Complies with ANSI TIA/EIA-485-A-1998 and
ISO 8482: 1987(E)
250 kbps data rate
±4 kV HBM ESD protection on all pins
Single 5 V ± 10% supply
−7 V to +12 V bus common-mode range
Connect up to 32 nodes on the bus
Reduced slew rate for low EM interference
Short-circuit protection
30 μA supply current
APPLICATIONS
Low power RS-485 and RS-422 systems
DTE-DCE interface
Packet switching
Local area networks
Data concentration
Data multiplexers
Integrated services digital network (ISDN)
GENERAL DESCRIPTION
The ADM488A and ADM489A are low power, differential line
transceivers suitable for communication on multipoint bus
transmission lines. They are intended for balanced data
transmission and comply with both RS-485 and RS-422
standards of the Electronics Industries Association (EIA). Both
products contain a single differential line driver and a single
differential line receiver, making them suitable for full-duplex
data transfer. The ADM489A contains an additional receiver
and driver enable control.
The input impedance is 12 kΩ, allowing 32 transceivers to be
connected on the bus. The ADM488A/ADM489A operate from
a single 5 V ± 10% power supply.
FUNCTIONAL BLOCK DIAGRAMS
ADM488A
R
D
RO
DI
A
B
Z
Y
08498-001
Figure 1.
ADM488A
ADM489A
R
D
RO
DI
A
B
Z
Y
DE
RE
08498-002
Figure 2.
ADM489A
Excessive power dissipation that is caused by bus contention or
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 ADM488A/ADM489A are fabricated on BiCMOS, an
advanced mixed technology process combining low power
CMOS with fast switching bipolar technology.
The ADM488A/ADM489A are fully specified over the industrial
temperature range and are available in SOIC and MSOP packages.
ADM488A/ADM489A Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagrams ............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Specifications .................................................................. 4
Absolute Maximum Ratings ............................................................ 5
ESD Caution .................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ..............................................8
Test Circuits ........................................................................................9
Switching Characteristics .......................................................... 10
Theory of Operation ...................................................................... 11
Applications Information .............................................................. 13
Differential Data Transmission ................................................ 13
Cable and Data Rate ................................................................... 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 15
REVISION HISTORY
6/14—Rev. A to Rev. B
Changes to Features Section............................................................ 1
Changes to Table 3 ............................................................................ 5
11/10—Rev. 0 to Rev. A
Changes to Table 2 ............................................................................ 4
Changes to Figure 20 ...................................................................... 11
Changes to Figure 21 ...................................................................... 12
Added New Figure 23, Renumbered Subsequent Figures,
Moved Old Figure 23 to New Figure 25 ...................................... 14
Changes to Ordering Guide .......................................................... 15
10/09—Revision 0: Initial Version
Rev. B | Page 2 of 16
Data Sheet ADM488A/ADM489A
SPECIFICATIONS
V
CC
= 5 V ± 10%; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
DRIVER
Differential Output Voltage V
OD
5.0 V R = ∞, see Figure 11
2.0 5.0 V V
CC
= 5 V, R = 50 Ω (RS-422), see Figure 11
1.5 5.0 V R = 27 Ω (RS-485), see Figure 11
1.5 5.0 V V
TST
= –7 V to +12 V, see Figure 12, V
CC
= 5 V ± 5%
Δ|V
OD
| for Complementary Output States 0.2 V R = 27 Ω or 50 Ω, see Figure 11
Common-Mode Output Voltage V
OC
3.0 V R = 27 Ω or 50 Ω, see Figure 11
Δ|V
OC
| for Complementary Output States 0.2 V R = 27 Ω or 50 Ω
Output Short-Circuit Current
V
OUT
250 mA −7 V ≤ V
O
≤ +12 V
CMOS Input Logic Threshold Low V
INL
1.4 0.8 V
CMOS Input Logic Threshold High
V
INH
2.0
1.4
V
Logic Input Current (DE, DI) ±1.0 µA
RECEIVER
Differential Input Threshold Voltage
V
TH
−0.2
+0.2
V
−7 V ≤ V
CM
≤ +12 V
Input Voltage Hysteresis ΔV
TH
70 mV V
CM
= 0 V
Input Resistance 12 kΩ −7 V ≤ V
CM
≤ +12 V
Input Current (A, B) 1 mA V
IN
= 12 V
−0.8 mA V
IN
= −7 V
Logic Enable Input Current (RE)
±1 µA
CMOS Output Voltage Low V
OL
0.4 V I
OUT
= +4.0 mA
CMOS Output Voltage High V
OH
4.0 V I
OUT
= −4.0 mA
Short-Circuit Output Current 7 85 mA V
OUT
= GND or V
CC
Three-State Output Leakage Current ±1.0 µA 0.4 V ≤ V
OUT
≤ 2.4 V
POWER SUPPLY CURRENT I
CC
Outputs unloaded, receivers enabled
30 60 µA DE = 0 V (disabled)
37 74 µA DE = 5 V (enabled)
Rev. B | Page 3 of 16
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

ADM489ABRMZ-REEL7

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Analog Devices Inc.
Description:
RS-422/RS-485 Interface IC 5V 250kbps Full Duplex RS485 Trans IC
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