ADM485 Fast Delivery |IC PHOENIX CO.,LIMITED

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ADM485
+5 V Low Power EIA RS-485 Transceiver
REV.C
5 V Low Power
EIA RS-485 Transceiver
FUNCTIONAL BLOCK DIAGRAM
8-Lead
FEATURES
Meets EIA RS-485 Standard
5 Mbps Data Rate
Single 5 V Supply
–7 V to +12 V Bus Common-Mode Range
High Speed, Low Power BiCMOS
Thermal Shutdown Protection
Short Circuit Protection
Driver Propagation Delay: 10 ns
Receiver Propagation Delay: 15 ns
High Z Outputs with Power Off
Superior Upgrade for LTC485
APPLICATIONS
Low Power RS-485 Systems
DTE-DCE Interface
Packet Switching
Local Area Networks
Data Concentration
Data Multiplexers
Integrated Services Digital Network (ISDN)
GENERAL DESCRIPTION
The ADM485 is a differential line transceiver suitable for high
speed bidirectional data communication on multipoint bus trans-
mission lines. It is designed for balanced data transmission and
complies with both EIA Standards RS-485 and RS-422. The part
contains a differential line driver and a differential line receiver.
Both the driver and the receiver may be enabled independently.
When disabled, the outputs are three-stated.
The ADM485 operates from a single 5 V power supply. 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 condi-
tions a significant temperature increase is detected in the internal
driver circuitry.
Up to 32 transceivers may be connected simultaneously on a bus,
but only one driver should be enabled at any time. It is important,
therefore, that the remaining disabled drivers do not load the bus.
To ensure this, the ADM485 driver features high output imped-
ance when disabled and also when powered down.
This minimizes the loading effect when the transceiver is not being
utilized. The high impedance driver output is maintained over
the entire common-mode voltage range from –7 V to +12V.
The receiver contains a fail-safe feature that results in a logic
high output state if the inputs are unconnected (floating).
The ADM485 is fabricated on BiCMOS, an advanced mixed
technology process combining low power CMOS with fast switching
bipolar technology. All inputs and outputs contain protection
against ESD; all driver outputs feature high source and sink current
capability. An epitaxial layer is used to guard against latch-up.
The ADM485 features extremely fast switching speeds. Minimal
driver propagation delays permit transmission at data rates up to
5 Mbps while low skew minimizes EMI interference.
The part is fully specified over the commercial and industrial
temperature range and is available in DIP, SOIC, and small
footprint MSOP packages.
ADM485–SPECIFICATIONS(VCC = 5 V � 5%. All specifications TMIN to TMAX, unless otherwise noted.)
Specifications subject to change without notice.
TIMING SPECIFICATIONS
RECEIVER
*Guaranteed by characterization.
Specifications subject to change without notice.
(VCC = 5 V � 5%. All specifications TMIN to TMAX, unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS*
(TA = 25∞C, unless otherwise noted.)
VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 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). . . . . . . . . . . . . . . . . . –9 V to +14 V
Outputs
Driver Outputs (A, B). . . . . . . . . . . . . . . . . . –9 V to +14 V
Receiver Output. . . . . . . . . . . . . . . . . –0.5 V to VCC + 0.5 V
Power Dissipation 8-Lead MSOP. . . . . . . . . . . . . . . . 900 mWqJA, Thermal Impedance. . . . . . . . . . . . . . . . . . . . 206∞C/W
Power Dissipation 8-Lead DIP. . . . . . . . . . . . . . . . . . 500 mWqJA, Thermal Impedance. . . . . . . . . . . . . . . . . . . . 130∞C/W
Power Dissipation 8-Lead SOIC. . . . . . . . . . . . . . . . . 450 mWqJA, Thermal Impedance. . . . . . . . . . . . . . . . . . . . 170∞C/W
Operating Temperature Range
Commercial (J Version). . . . . . . . . . . . . . . . . . . 0∞C to 70∞C
Industrial (A Version). . . . . . . . . . . . . . . . . –40∞C to +85∞C
Storage Temperature Range. . . . . . . . . . . . –65∞C to +150∞C
Lead Temperature (Soldering, 10 sec). . . . . . . . . . . . . 300∞C
Vapor Phase (60 sec). . . . . . . . . . . . . . . . . . . . . . . . . 215∞C
Infrared (15 sec). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220∞C
*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.
PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
ORDERING GUIDE
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADM485 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
Table I.Transmitting
Table II.Receiving
ADM485
Test Circuits
Test Circuit 1.Driver Voltage Measurement
Test Circuit 2.Driver Voltage Measurement
Test Circuit 3.Driver Propagation Delay
Test Circuit 4.Driver Enable/Disable
Test Circuit 5.Receiver Propagation Delay
Test Circuit 6.Receiver Enable/Disable
Switching Characteristics
Figure 1.Driver Propagation Delay, Rise/Fall Timing
Figure 3.Receiver Propagation Delay
TPC 1.Output Current vs. Receiver Output Low Voltage
TPC 2. Output Current vs. Receiver Output High Voltage
TPC 3.Receiver Output High Voltage vs. Temperature
TPC 4.Receiver Output Low Voltage vs. Temperature
TPC 5.Output Current vs. Driver Differential
Output Voltage
TPC 6. Driver Differential Output Voltage vs.
Temperature, RL = 26.8 W
ADM485
TPC 7. Output Current vs. Driver Output Low Voltage
TPC 8. Output Current vs. Driver Output High Voltage
TPC 9.Supply Current vs. Temperature
TPC 10.Rx Skew vs. Temperature
TPC 11.Tx Skew vs. Temperature
TPC 12.Tx Pulsewidth Distortion

Partno	Mfg	Dc	Qty	Available	Descript
ADM485	AD	N/a	212	avai	+5 V Low Power EIA RS-485 Transceiver