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ADM1486AR-REEL7-ADM1486ARZ-ADM1486ARZ-REEL7
+5 V Low Power RS-485 PROFIBUS Transceiver
REV. 0
5 V, 0.8 mA PROFIBUS
RS-485 Transceiver
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Meets and Exceeds EIA RS-485 and EIA RS-422 Standards
30 Mbps Data Rate
Recommended for PROFIBUS Applications
2.1 V Minimum Differential Output with 54 � Termination
Low Power 0.8 mA ICC
Thermal Shutdown and Short Circuit Protection
0.5 ns Skew Driver and Receiver
Driver Propagation Delay: 11 ns
Receiver Propagation Delay: 12 ns
High Impedance Outputs with Drivers Disabled or Power Off
Superior Upgrade for SN65ALS1176
Available in Standard 8-Lead SOIC Package
APPLICATIONS
Industrial Field Equipment
GENERAL DESCRIPTIONThe ADM1486 is a differential line transceiver suitable for high
speed bidirectional data communication on multipoint bus
transmission lines. It is designed for balanced data transmission,
complies with EIA Standards RS-485 and RS-422, and is rec-
ommended for PROFIBUS applications. The part containsdifferential line driver and a differential line receiver. Both the
driver and the receiver may be enabled independently. When
disabled or with power off, the driver outputs are high impedance.
The ADM1486 operates from a single 5 V power supply.
Excessive power dissipation caused by bus contention or by output
shorting is prevented by short circuit protection and thermal
circuitry. Short circuit protection circuits limit the maximum
output current to ±200 mA during fault conditions. A thermal
shutdown circuit senses if the die temperature rises above 150°C
and forces the driver outputs into a high impedance state under
this condition.
Up to 50 transceivers may be connected simultaneously on a bus,
but only one driver should be enabled at any time. It is therefore
important that the remaining disabled drivers do not load the bus.
To ensure this, the ADM1486 driver features high output imped-
ance when disabled and when powered down.
This minimizes the loading effect when the transceiver is not
being used. The high impedance driver output is maintained
over the entire common-mode voltage range from –7 V to +12 V.
The receiver contains a fail-safe feature that results in a logic
high output state if the inputs are unconnected (floating).
The ADM1486 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 ADM1486 features extremely fast and closely matched
switching, enable, and disable times. Minimal driver propagation
delays permit transmission at data rates up to 30 Mbps while
low skew minimizes EMI interference.
The part is fully specified over the commercial and industrial
temperature range and is available in an 8-lead SOIC package.
ADM1486–SPECIFICATIONS(VCC = 5 V � 5%. All specifications TMIN to TMAX, unless otherwise noted.)Specifications subject to change without notice.
TIMING SPECIFICATIONSRECEIVER
*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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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) . . . . . . . . . . . . . . . . . –9 V to +14 V
Outputs
Driver Outputs . . . . . . . . . . . . . . . . . . . . . . . –9 V to +14 V
Receiver Output . . . . . . . . . . . . . . . . –0.5 V to VCC + 0.5 V
Power Dissipation 8-Lead SOIC . . . . . . . . . . . . . . . . 450 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 170°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 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.
ORDERING GUIDE
CAUTIONESD (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 ADM1486 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
ADM1486
Table I.Transmitting
Table II.Receiving
PIN CONFIGURATION
PIN FUNCTION DESCRIPTION3DEDriver Output Enable. A high level enables the driver differential outputs, A and B. A low level places it in a
4DIDriver Input. When the driver is enabled, a logic Low on DI forces A low and B high while a logic High on DI
5GND
Switching CharacteristicsFigure 1.Driver Propagation Delay, Rise/Fall Timing
Figure 3.Receiver Propagation Delay
Test CircuitsTest 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
ADM1486–Typical Performance Characteristics0.250.500.751.001.251.501.752.00
OUTPUT VOLTAGE – V
OUTPUT CURRENT – mATPC 1. Output Current vs. Receiver Output
Low Voltage
OUTPUT VOLTAGE – V
OUTPUT CURRENT – mA
3.503.754.004.254.504.755.00TPC 2. Output Current vs. Receiver Output
High Voltage
TEMPERATURE – �C
OUTPUT V
GE
– V
–50–250255075100125TPC 3. Receiver Output High Voltage
TEMPERATURE – �C
OUTPUT V
GE
– V
–50–250255075100125TPC 4. Receiver Output Low Voltage
vs. Temperature I = 8 mA
OUTPUT VOLTAGE – V
OUTPUT CURRENT – mA
–100.51.01.52.02.53.03.54.04.5TPC 5. Output Current vs. Driver Differential
Output Voltage
TEMPERATURE – �C
OUTPUT V
GE
– V
–50–250255075100125TPC 6. Driver Differential Output Voltage
