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ADM2486BRW-ADM2486BRWZ-ADM2486BRWZ-REEL
iCoupler® High Speed Isolated RS-485 Tranceiver
High Speed Half-Duplex iCoupler®
Isolated RS-485 Transceiver
Rev. 0
FEATURES
Half-duplex isolated RS-485 transceiver
PROFIBUS compliant
Complies with ANSI TIA/EIA RS-485-A-1998 and
ISO 8482:1987(E)
20 Mbps data rate
Low power operation: 12 mA (IDD1 + IDD2) @ 20 Mbps
5 V or 3 V operation (VDD1)
High common-mode transient immunity: >25 kV/μs
Isolated DE status output
Receiver open-circuit fail-safe design
Thermal shutdown protection
Safety and regulatory approvals:
UL recognition—2500 VRMS for 1 minute per UL 1577
CSA component acceptance notice #5A
VDE certificate of conformity
DIN EN 60747-5-2 (VDE 0884 Part 2):2003-01
DIN EN 60950 (VDE 0805):2001-12; EN 60950:2000
VIORM = 560 V peak
Operating temperature range: −40° to 85°C
Wide-body, 16-lead SOIC package
APPLICATIONS
Isolated RS-485/RS-422 interfaces
PROFIBUS networks
Industrial field networks
Multipoint data transmission systems
GENERAL DESCRIPTION The ADM2486 differential bus transceiver is an integrated,
galvanically isolated component designed for bidirectional
data communication on multipoint bus transmission lines. It
is designed for balanced transmission lines and complies with
ANSI TIA/EIA RS-485-A-1998 and ISO 8482:1987(E).
The device employs Analog Devices’ iCoupler technology to
combine a 3-channel isolator, a 3-state differential line driver,
and a differential input receiver into a single package. The logic
side of the device can be powered with either a 5 V or a 3 V
supply while the bus side is powered with an isolated 5 V
supply.
The ADM2486 driver has an active high enable. The driver
differential outputs and the receiver differential inputs are
connected internally to form a differential input/output port
that imposes minimal loading on the bus when the driver is
disabled or when VDD1 or VDD2 = 0 V. Also provided is an active
high receiver disable that causes the receive output to enter a
high impedance state.
The device has current-limiting and thermal shutdown features
to protect against output short circuits and situations where bus
contention might cause excessive power dissipation. The part is
fully specified over the industrial temperature range and is
available in a 16-lead, wide-body SOIC package.
FUNCTIONAL BLOCK DIAGRAM
REQUESTTOSEND,RTS
VDD1
BUSENABLE,DE
GND1
VDD2GND2
LOGIC SIDE
TRANSMITDATA,TxD
RECEIVEDATA,RxD
BUS SIDERECEIVEENABLE,RE
Figure 1.
TABLE OF CONTENTSSpecifications.....................................................................................3
Timing Specifications.......................................................................5
Absolute Maximum Ratings............................................................6
ESD Caution..................................................................................6
ADM2486 Characteristics...............................................................7
Package Characteristics...............................................................7
Regulatory Information...............................................................7
Insulation and Safety-Related Specifications............................7
VDE 0884 Insulation Characteristics........................................8
Pin Configuration and Function Descriptions.............................9
Test Circuits.....................................................................................10
Switching Characteristics..............................................................11
Typical Performance Characteristics...........................................12
Circuit Description.........................................................................13
Electrical Isolation......................................................................13
Truth Tables.................................................................................13
Power-Up/Power-Down Thresholds.......................................13
Thermal Shutdown....................................................................14
Receiver Fail-Safe Inputs...........................................................14
Magnetic Field Immunity..........................................................14
Applications Information..............................................................15
Power Valid Input.......................................................................15
Isolated Power-Supply Circuit..................................................15
Outline Dimensions.......................................................................16
Ordering Guide..........................................................................16
REVISION HISTORY
7/04—Revision 0: Initial Version SPECIFICATIONS2.7 ≤ VDD1 ≤ 5.5 V, 4.75 V ≤ VDD2 ≤ 5.25 V, TA = TMIN to TMAX, unless otherwise noted.
Table 1. 1 CM is the maximum common-mode voltage slew rate that can be sustained while maintaining specification-compliant operation. VCM is the common-mode potential
difference between the logic and bus sides. The transient magnitude is the range over which the common-mode is slewed. The common-mode voltage slew rates
apply to both rising and falling common-mode voltage edges.
TIMING SPECIFICATIONS 2.7 ≤ VDD1 ≤ 5.5 V, 4.75 V ≤ VDD2 ≤ 5.25 V, TA = TMIN to TMAX, unless otherwise noted.
Table 2.
ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. All voltages are relative to
their respective ground.
Table 3. Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product 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.
ADM2486 CHARACTERISTICS
PACKAGE CHARACTERISTICS
Table 4. 1 Device considered a two-terminal device: pins 1, 2, 3, 4, 5, 6, 7, and 8 shorted together and pins 9, 10, 11, 12, 13, 14, 15, and 16 shorted together. Input capacitance is from any input data pin to ground.
REGULATORY INFORMATION The ADM2486 will be approved by the following organizations upon product release:
Table 5.
INSULATION AND SAFETY-RELATED SPECIFICATIONS
Table 6.
VDE 0884 INSULATION CHARACTERISTICS This isolator is suitable for safe electrical isolation only within the safety limit data. Maintenance of the safety data must be ensured by
means of protective circuits.
An asterisk (*) on packages denotes VDE 0884 approval for 560 V peak working voltage.
Table 7.
