ADM488AN ,Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceiversspecifications T to T unlessCC MIN MAXotherwise noted)ADM488/ADM489–
ADM488AR ,Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 TransceiversSPECIFICATIONSParameter Min Typ Max Units Test Conditions/CommentsDRIVERDifferential Output Voltage ..
ADM489A ,5 V, Slew-Rate Limited, Low Power, 250 kbps, Full Duplex EIA RS-485 Transceiver (with DE/RE)GENERAL DESCRIPTIONExcessive power dissipation that is caused by bus contention or The ADM488A and ..
ADM489AR ,Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceiversspecifications T to T unless otherwise noted)CC MIN MAXParameter Min Typ Max Units Test Conditions/ ..
ADM489ARU ,Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 TransceiversAPPLICATIONSLow Power RS-485 SystemsDTE-DCE Interface ADM489Packet SwitchingALocal Area NetworksRO ..
ADM489ARZ , Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers
AIC1550POTR , Low-Noise Synchronous PWM Step-Down DC/DC Converter
AIC1553CV , Compact 500KHz PWM/PFM, Step-Down DC/DC Converters
AIC1562CN , High-Efficiency, Bootstrapped DC/DC Converter
AIC1562CS , High-Efficiency, Bootstrapped DC/DC Converter
AIC1562CS , High-Efficiency, Bootstrapped DC/DC Converter
AIC1563 , Versatile DC/DC Converter
ADM488AN-ADM488AR-ADM489AR-ADM489ARU
Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers
REV.0
Full-Duplex, Low Power,
Slew Rate Limited, EIA RS-485 Transceivers
FUNCTIONAL BLOCK DIAGRAMSFEATURES
Meets EIA RS-485 Standard
250kbps Data Rate
Single +5 V 6 10% Supply
–7 V to +12 V Bus Common-Mode Range
12 kV Input ImpedancekV 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 ImmunitymA Supply Current
APPLICATIONS
Low Power RS-485 Systems
DTE-DCE Interface
Packet Switching
Local Area Networks
Data Concentration
Data Multiplexers
Integrated Services Digital Network (ISDN)
GENERAL DESCRIPTIONThe ADM488 and ADM489 are low power differential line
transceiver suitable for communication on multipoint bus trans-
mission lines.
They are intended for balanced data transmission and comply
with both EIA Standards RS-485 and RS-422. Both products
contains 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 operates from a single +5 V ± 10%
power supply. Excessive power dissipation caused by bus con-
tention or by output shorting is prevented by a thermal shut-
down circuit. This feature forces the driver output into a high
impedance state if during fault conditions a significant tempera-
ture 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 ADM488/ADM489 is fabricated on BiCMOS, an ad-
vanced mixed technology process combining low power CMOS
with fast switching bipolar technology.
The ADM488/ADM489 is fully specified over the industrial
temperature range and is available in DIP, SOIC and TSSOP
packages.
ADM488/ADM489–SPECIFICATIONS
(VCC = +5 V 6 10%. All specifications TMIN to TMAX unless
otherwise noted)
Specifications subject to change without notice.
TIMING SPECIFICATIONS
Specifications subject to change without notice.
(VCC = +5 V 6 10%. All specifications TMIN to TMAX unless otherwise noted)
ABSOLUTE MAXIMUM RATINGS*
(TA = +25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7 V
Inputs
Driver Input (DI) . . . . . . . . . . . . . . . –0.3 V to VCC + 0.3 V
Control Inputs (DE, RE) . . . . . . . . . –0.3 V to VCC + 0.3 V
Receiver Inputs (A, B) . . . . . . . . . . . . . . . . –14 V to +14 V
Outputs
Driver Outputs . . . . . . . . . . . . . . . . . . . . . –14 V to +12.5 V
Receiver Output . . . . . . . . . . . . . . . . –0.5 V to VCC + 0.5 V
Power Dissipation 8-Lead DIP . . . . . . . . . . . . . . . . . 700 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 120°C/W
Power Dissipation 8-Lead SOIC . . . . . . . . . . . . . . . . 520 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 110°C/W
Power Dissipation 14-Lead DIP . . . . . . . . . . . . . . . . 800 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 140°C/W
Power Dissipation 14-Lead SOIC . . . . . . . . . . . . . . . 800 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 120°C/W
ORDERING GUIDE
Power Dissipation 16-Lead TSSOP . . . . . . . . . . . . . . 800 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 150°C/W
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . +300°C
Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . .+220°C
ESD Rating, MIL-STD-883B . . . . . . . . . . . . . . . . . . . . . 4 kV
EFT Rating, IEC1000-4-4 . . . . . . . . . . . . . . . . . . . . . . . 2 kV
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum ratings
for extended periods of time may affect device reliability.
ADM488/ADM489
ADM488 PIN FUNCTION DESCRIPTIONS
ADM489 PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATIONS
8-Lead DIP/SO
VCC
GND
14-Lead DIP/SO
NC = NO CONNECT
VCCDI
GND
GND
16-Lead TSSOP
NC = NO CONNECT
VCCDE
GND
GNDNC
Figure 1.Driver Voltage Measurement Test Circuit
Figure 2.Driver Enable/Disable Test Circuit
Test CircuitsS2
VCC
0V OR 3V
DE IN
Figure 3.Driver Voltage Measurement Test Circuit 2
VCC
RE IN
+1.5V
–1.5V
Figure 4.Receiver Enable/Disable Test Circuit
+3V
Figure 5.Driver/Receiver Propagation Delay Test Circuit
ADM488/ADM489
Switching Characteristics
–VO
1/2VO
1.5V1.5V
TSKEW
+VO
90% POINT
10% POINT
90% POINT
TSKEWTF
Figure 6.Driver Propagation Delay, Rise/Fall Timing0V
A–B
VOL
VOH
Figure 7.Receiver Propagation DelayDE
VOH
A, B
VOL
A, B
Figure 8.Driver Enable/Disable Timing
TZH
1.5V1.5V
VOH
TZL
VOL
O/P LOW
O/P HIGH
Figure 9.Receiver Enable/Disable Timing
