RS-485 Transceivers. ADM489A Datasheet

ADM489A Transceivers. Datasheet pdf. Equivalent

ADM489A Datasheet
Recommendation ADM489A Datasheet
Part ADM489A
Description EIA RS-485 Transceivers
Feature ADM489A; Data Sheet Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers ADM488A/ADM489A FEAT.
Manufacture Analog Devices
Datasheet
Download ADM489A Datasheet




Analog Devices ADM489A
Data Sheet
Full-Duplex, Low Power,
Slew Rate Limited, EIA RS-485 Transceivers
ADM488A/ADM489A
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
RO R
A
B
DI D
Z
Y
Figure 1. ADM488A
ADM489A
A
RO R
B
RE
DE
DI D
Z
Y
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.
Rev. B
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Analog Devices ADM489A
ADM488A/ADM489A
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
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
Data Sheet
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
Rev. B | Page 2 of 16



Analog Devices ADM489A
Data Sheet
ADM488A/ADM489A
SPECIFICATIONS
VCC = 5 V ± 10%; all specifications TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter
DRIVER
Differential Output Voltage
Δ|VOD| for Complementary Output States
Common-Mode Output Voltage
Δ|VOC| for Complementary Output States
Output Short-Circuit Current
VOUT
CMOS Input Logic Threshold Low
CMOS Input Logic Threshold High
Logic Input Current (DE, DI)
RECEIVER
Differential Input Threshold Voltage
Input Voltage Hysteresis
Input Resistance
Input Current (A, B)
Logic Enable Input Current (RE)
CMOS Output Voltage Low
CMOS Output Voltage High
Short-Circuit Output Current
Three-State Output Leakage Current
POWER SUPPLY CURRENT
Symbol Min Typ Max Unit Test Conditions/Comments
VOD
2.0
1.5
1.5
VOC
5.0 V
5.0 V
5.0 V
5.0 V
0.2 V
3.0 V
0.2 V
R = ∞, see Figure 11
VCC = 5 V, R = 50 Ω (RS-422), see Figure 11
R = 27 Ω (RS-485), see Figure 11
VTST = –7 V to +12 V, see Figure 12, VCC = 5 V ± 5%
R = 27 Ω or 50 Ω, see Figure 11
R = 27 Ω or 50 Ω, see Figure 11
R = 27 Ω or 50 Ω
250 mA −7 V ≤ VO ≤ +12 V
VINL 1.4 0.8 V
VINH 2.0 1.4
V
±1.0 µA
VTH
ΔVTH
VOL
VOH
ICC
−0.2
70
12
4.0
7
30
37
+0.2 V
mV
kΩ
1 mA
−0.8 mA
±1 µA
0.4 V
V
85 mA
±1.0 µA
60 µA
74 µA
−7 V ≤ VCM ≤ +12 V
VCM = 0 V
−7 V ≤ VCM ≤ +12 V
VIN = 12 V
VIN = −7 V
IOUT = +4.0 mA
IOUT = −4.0 mA
VOUT = GND or VCC
0.4 V ≤ VOUT ≤ 2.4 V
Outputs unloaded, receivers enabled
DE = 0 V (disabled)
DE = 5 V (enabled)
Rev. B | Page 3 of 16







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