OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

ADM489ARUZ-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Full-Duplex, Low Power,
Slew Rate Limited, EIA RS-485 Transceivers
ADM488/ADM489
Rev. D
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
Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved.
FEATURES
Meets EIA RS-485 and RS-422 standards
250 kbps data rate
Single 5 V ± 10% supply
−7 V to +12 V bus common-mode range
12 kΩ input impedance
2 kV EFT protection meets IEC1000-4-4
High EM immunity meets IEC1000-4-3
Reduced slew rate for low EM interference
Short-circuit protection
Excellent noise immunity
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 ADM488 and ADM489 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 Electronics Industries
Association (EIA) RS-485 and RS-422 standards. Both products
contain a single differential line driver and a single differential
line receiver, making them suitable for full-duplex data transfer.
The ADM489 contains an additional receiver and driver enable
control.
The input impedance is 12 kΩ, allowing 32 transceivers to be
connected on the bus.
The ADM488/ADM489 operate from a single 5 V ± 10% power
supply. Excessive power dissipation 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.
FUNCTIONAL BLOCK DIAGRAMS
ADM488
R
D
RO
DI
A
B
Z
Y
00079-001
Figure 1.
ADM489
R
D
RO
DI
A
B
Z
Y
DE
RE
00079-002
Figure 2.
The receiver contains a fail-safe feature that results in a logic
high output state if the inputs are unconnected (floating).
The ADM488/ADM489 are fabricated on BiCMOS, an
advanced mixed technology process combining low power
CMOS with fast switching bipolar technology.
The ADM488/ADM489 are fully specified over the industrial
temperature range and are available in PDIP, SOIC, and TSSOP
packages.
ADM488/ADM489
Rev. D | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagrams............................................................. 1
Specifications..................................................................................... 3
Timing Specifications .................................................................. 4
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Test Circuits................................................................................... 7
Switching Characteristics ............................................................ 8
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 11
EFT Transient Protection Scheme ........................................... 11
Fast Transient Burst Immunity (IEC1000-4-4)...................... 11
Radiated Immunity (IEC1000-4-3) ......................................... 12
EMI Emissions............................................................................ 13
Conducted Emissions................................................................ 13
Application Information................................................................ 14
Differential Data Transmission ................................................ 14
Cable and Data Rate................................................................... 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 16
REVISION HISTORY
4/06—Rev. C to Rev. D
Updated Outline Dimensions....................................................... 15
Changes to Ordering Guide .......................................................... 16
11/04—Rev. B to Rev. C
Updated Format..................................................................Universal
Changes to Receiving Truth Table Inputs Data Section............ 11
Renamed General Information to Theory of Operation........... 12
Updated Outline Dimensions....................................................... 15
Changes to Ordering Guide .......................................................... 16
5/01—Rev. A to Rev. B
Changes to Absolute Maximum Ratings Section......................... 3
3/01—Rev. 0 to Rev. A
Changes to ESD Specification, Absolute Maximum Ratings...... 3
6/97—Revision 0: Initial Version
ADM488/ADM489
Rev. D | Page 3 of 16
SPECIFICATIONS
V
CC
= 5 V ± 10%. All specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
DRIVER
Differential Output Voltage, V
OD
5.0 V R = ∞, see Figure 6
2.0 5.0 V V
CC
= 5 V, R = 50 Ω (RS-422), see Figure 6
1.5 5.0 V R = 27 Ω (RS-485), see Figure 6
1.5 5.0 V V
TST
= –7 V to +12 V, see Figure 7, V
CC
= 5 V ± 5%
Δ|V
OD
| for Complementary Output States 0.2 V R = 27 Ω or 50 Ω, see Figure 6
Common-Mode Output Voltage, V
OC
3 V R = 27 Ω or 50 Ω, see Figure 6
Δ|V
OC
| for Complementary Output States 0.2 V R = 27 Ω or 50 Ω
Output Short-Circuit Current (V
OUT
= High) 250 mA −7 V ≤ V
O
≤ +12 V
Output Short-Circuit Current (V
OUT
= Low) 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, Δ V
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 Outputs unloaded, receivers enabled
I
CC
30 60 μA DE = 0 V (disabled)
37 74 μA DE = 5 V (enabled)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

ADM489ARUZ-REEL7

Mfr. #:
Buy ADM489ARUZ-REEL7
Manufacturer:
Analog Devices Inc.
Description:
RS-422/RS-485 Interface IC Full Duplex,RS-485 Transceiver I.C.
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet