IL3085
Low-Cost Isolated RS-485 Transceivers
Features
Functional Diagrams
DE
•
•
•
•
•
•
•
•
•
•
•
•
•
4 Mbps data rate
Supports up to 32 nodes
3 V to 5 V power supplies
50 kV/μs typ.; 30 kV/μs min. common mode transient immunity
Low quiescent supply current
600 VRMS working voltage per VDE V 0884-10
2500 VRMS isolation voltage per UL 1577
44000 year barrier life
7 kV bus ESD protection
Low EMC footprint
Thermal shutdown protection
−40°C to +85°C temperature range
Meets or exceeds ANSI RS-485 and ISO 8482:1987(E)
• VDE V 0884-10 certified; UL 1577 recognized
• QSOP, 0.15" SOIC, and 0.3" True 8™ mm 16-pin SOIC packages
ISODE
XDE
D
A
B
R
RE
ISOR
IL3085-1
(QSOP)
DE
ISODE
Applications
XDE
•
•
•
•
•
D
A
B
R
Factory automation
Industrial control networks
Building environmental controls
Equipment covered under IEC 61010-1 Edition 3
5 kVRMS rated IEC 60601-1 medical applications
RE
Description
IL3085-3
(narrow-body)
The IL3085 is a galvanically isolated, high-speed differential bus
transceiver, designed for bidirectional data communication on
balanced transmission lines. The device uses NVE’s patented*
IsoLoop spintronic Giant Magnetoresistance (GMR) technology.
DE
ISODE
A unique ceramic/polymer composite barrier provides excellent
isolation and virtually unlimited barrier life.
The wide-body version provides true 8 mm creepage. Narrow-body
and QSOP packages offer unprecedented miniaturization.
D
A
B
R
The IL3085 delivers at least 1.5 V into a 27 Ω load for excellent data
integrity over long cable lengths. The device is compatible with
3.3 V input supplies, allowing interface to standard microcontrollers
without additional level shifting.
RE
IL3085
(wide-body)
VID (A-B)
DE
RE
R
D
Mode
≥ 200 mV
L
L
H
X
Receive
≤−200 mV
L
L
L
X
Receive
≥ 1.5 V
H
L
H
H
Drive
≤−1.5 V
H
L
L
L
Drive
X
X
H
Z
X
Hi-Z R
Open
L
L
H
X
Receive
Current limiting and thermal shutdown features protect against
output short circuits and bus contention that may cause excessive
power dissipation. Receiver inputs feature a “fail-safe if open”
design, ensuring a logic high R-output if A/B are floating.
IsoLoop® is a registered trademark of NVE Corporation.
*U.S. Patent number 5,831,426; 6,300,617 and others.
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
REV. H
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
©NVE Corporation
IL3085
Absolute Maximum Ratings(11)
Parameter
Storage Temperature
Junction Temperature
Ambient Operating Temperature
Voltage Range at A or B Bus Pins
Supply Voltage(1)
Digital Input Voltage
Digital Output Voltage
ESD (all bus nodes)
Symbol
TS
TJ
TA
VDD1, VDD2
Min.
−55
−55
−40
−8
−0.5
−0.5
−0.5
7
Typ.
Min.
3.0
4.5
−40
Typ.
Max.
150
150
85
12.5
7
VDD + 0.5
VDD + 1
Units
°C
°C
°C
V
V
V
V
kV
Test Conditions
Max.
5.5
5.5
100
12
−7
Units
Test Conditions
VDD1
V
0.8
+12 / −7
60
V
V
mA
8
mA
HBM
Recommended Operating Conditions
Parameter
Junction Temperature
Input Voltage at any Bus Terminal
(separately or common mode)
Symbol
VDD1
VDD2
TJ
VI
VIC
High-Level Digital Input Voltage
VIH
Low-Level Digital Input Voltage
Differential Input Voltage(2)
High-Level Output Current (Driver)
High-Level Digital Output Current
(Receiver)
Low-Level Output Current (Driver)
Low-Level Digital Output Current
(Receiver)
Ambient Operating Temperature
Digital Input Signal Rise and Fall Times
VIL
VID
IOH
Supply Voltage
2.4
3.0
0
IOH
V
°C
V
IOL
−60
mA
IOL
−8
mA
TA
tIR, tIF
−40
85
°C
DC Stable
Symbol
Min.
3.2
4.0
8.03
0.012
VDD1 = 3.3 V
VDD1 = 5.0 V
Insulation Specifications
Parameter
IL3085-1E
Creepage Distance
IL3085-3E
(external)
IL3085E
Total Barrier Thickness (internal)
Barrier Resistance
Barrier Capacitance
Leakage Current
Comparative Tracking Index
High Voltage Endurance
AC
(Maximum Barrier Voltage
for Indefinite Life)
DC
Typ.
VIO
Units
Test Conditions
mm
8.3
0.013
>1014
7
0.2
Per IEC 60601
≥175
1000
mm
Ω
pF
μARMS
V
VRMS
1500
VDC
RIO
CIO
CTI
Max.
Barrier Life
44000
500 V
f = 1 MHz
240 VRMS, 60 Hz
Per IEC 60112
At maximum
operating temperature
Years
100°C, 1000 VRMS, 60%
CL activation energy
Units
Test Conditions
Thermal Characteristics
Parameter
Symbol
Junction–Ambient
Thermal Resistance
Junction–Case (Top)
Thermal Resistance
Power Dissipation
QSOP
0.15" SOIC
0.3" SOIC
QSOP
0.15" SOIC
0.3" SOIC
QSOP
0.15" SOIC
0.3" SOIC
Min.
Typ.
63
40
34
35
20
17
θJA
θJT
Max.
°C/W
°C/W
675
700
800
PD
Soldered to doublesided board;
free air
mW
2
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
©NVE Corporation
IL3085
Safety and Approvals
VDE V 0884-10 (VDE V 0884-11 pending; Basic Isolation; VDE File Number 5016933-4880-0001)
• Working Voltage (VIORM) 600 VRMS (848 VPK); basic insulation; pollution degree 2
• Isolation voltage (VISO) 2500 VRMS
• Transient overvoltage (VIOTM) 4000 VPK
• Surge rating 4000 V
• Each part tested at 1590 VPK for 1 second, 5 pC partial discharge limit
• Samples tested at 4000 VPK for 60 sec.; then 1358 VPK for 10 sec. with 5 pC partial discharge limit
Safety-Limiting Values
Safety rating ambient temperature
Safety rating power (180°C)
Supply current safety rating (total of supplies)
Symbol
TS
PS
IS
Value
180
270
54
Units
°C
mW
mA
IEC 61010-1 (Edition 2; TUV Certificate Numbers N1502812; N1502812-101)
Reinforced Insulation; Pollution Degree II; Material Group III
Part No. Suffix
-1
-3
None
Package
QSOP
SOIC
True 8™ Wide-body SOIC
Working Voltage
150 VRMS
150 VRMS
300 VRMS
UL 1577 (Component Recognition Program File Number E207481)
Each part tested at 3000 VRMS (4240 VPK) for 1 second; each lot sample tested at 2500 VRMS (3530 VPK) for 1 minute
Soldering Profile
Per JEDEC J-STD-020C, MSL 1
3
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
©NVE Corporation
IL3085
IL3085-1 (QSOP Package) Pin Connections
1
VDD1
2
R
3
GND1
Input power supply ground return
4
RE
Read data enable
(if RE is high, R= high impedance)
5
DE
6
D
7, 8
NC
No internal connection
9
A
Non-inverting bus line
10
B
Inverting bus line
11
12
Input power supply
Output data from bus
Drive enable
Data input to bus
VDD2X
Output transceiver power supply
(normally connected to pin 16)
XDE
Transceiver Device Enable input enables the
transceiver from the bus side, or is
connected to ISODE to enable the transceiver from the controller-side DE input.
(this input should not be left unterminated)
13
ISOR
Isolated R output
(for testing; no connection should be made
to this pin)
14
GND2
Output power supply ground return.
15
ISODE
Isolated DE output
(normally connected to pin 12)
16
VDD2I
Output isolation power supply
(normally connected to pin 11)
VDD1
1
16
VDD2
R
2
15
ISODE
GND1
3
14
GND2
RE
4
13
ISOR
DE
5
12
XDE
D
6
11
VDD2X
NC
7
10
B
NC
8
9
A
IL3085-1
IL3085-3 (0.15" SOIC Package) Pin Connections
1
VDD1
Input power supply
2
GND1
Input power supply ground return
3
R
4
RE
Read data enable
(if RE is high, R= high impedance)
5
D
Data input to bus
6
DE
Drive enable
7, 8, 9
NC
No internal connection
Output data from bus
VDD1
1
16
VDD2I
GND1
2
15
GND2
R
3
14
ISODE
RE
4
13
VDD2X
D
5
12
B
DE
6
11
A
Transceiver Device Enable input enables the
transceiver from the bus side, or is
connected to ISODE to enable the transceiver from the controller-side DE input.
(this input should not be left unterminated)
10
XDE
11
A
Non-inverting bus line
12
B
Inverting bus line
NC
7
10
XDE
13
VDD2X
Output transceiver power supply
(normally connected to pin 16)
NC
8
9
NC
14
ISODE
Isolated DE output
(normally connected to pin 10)
15
GND2
Output power supply ground return.
16
VDD2I
Output isolation power supply
(normally connected to pin 13)
IL3085-3
4
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
©NVE Corporation
IL3085
IL3085 (0.3" SOIC Package) Pin Connections
1
VDD1
Input power supply
2
GND1
Input power supply ground return
(pin 2 is internally connected to pin 8)
3
R
4
RE
Read data enable
(if RE is high, R= high impedance)
5
DE
Drive enable
6
D
7
NC
8
GND1
Input power supply ground return
(pin 8 is internally connected to pin 2)
GND2
Output power supply ground return
(pin 9 is internally connected to pin 15)
10
ISODE
Isolated DE output for use in PROFIBUS
applications where the state of the isolated
drive enable node needs to be monitored.
11
NC
No internal connection
12
A
Non-inverting bus line
13
B
Inverting bus line
14
NC
15
GND2
Output power supply ground return
(pin 15 is internally connected to pin 9)
16
VDD2
Output power supply
9
Output data from bus
Data input to bus
No internal connection
VDD1
1
16
VDD2
GND1
2
15
GND2
R
3
14
NC
RE
4
13
B
DE
5
12
A
D
6
11
NC
NC
7
10
ISODE
GND1
8
9
GND2
IL3085
No internal connection
5
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
©NVE Corporation
IL3085
Driver Section
Electrical Specifications (Tmin to Tmax and VDD = 4.5 V to 5.5 V unless otherwise stated)
Typ.(5)
Parameter
Symbol
Min.
Max.
Units
Output voltage
VO
VDD
V
Differential Output Voltage(2)
|VOD1|
VDD
V
Differential Output Voltage(2, 6)
VOD3
1.5
2.3
5
V
Change in Magnitude of Differential
Δ|VOD|
±0.01
±0.2
V
Output Voltage(7)
Common Mode Output Voltage
VOC
3
V
Change in Magnitude of Common
Δ|VOC|
±0.01
±0.2
V
Mode Output Voltage(7)
1
Output Current(4)
IO
mA
−0.8
High Level Input Current
IIH
10
μA
Low Level Input Current
IIL
−10
μA
Absolute |Short-circuit Output Current|
IOS
250
mA
VDD1 = 5 V
4
6
IDD1
Supply Current
mA
VDD1 = 3.3 V
3
4
IDD1
Test Conditions
IO = 0
IO = 0
RL = 27 Ω, VDD = 4.5 V
RL = 27 Ω or 50 Ω
RL = 27 Ω or 50 Ω
RL = 27 Ω or 50 Ω
Output Disabled, VO = 12
VO = −7
VI = 3.5 V
VI = 0.4 V
−7 V < VO < 12 V
No Load
(Outputs Enabled)
Notes (apply to both driver and receiver sections):
1.
All voltages are with respect to network ground except differential I/O bus voltages.
2.
Differential input/output voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
3.
Skew limit is the maximum propagation delay difference between any two devices at 25°C.
4.
The power-off measurement in ANSI Standard EIA/TIA-422-B applies to disabled outputs only and is not applied to combined inputs and
outputs.
5.
All typical values are at VDD1,VDD2 = 5 V or VDD1= 3.3 V and TA = 25°C.
6.
−7 V < VCM < 12 V; 4.5 V < VDD < 5.5 V.
7.
Δ|VOD| and Δ|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from one logic state to
the other.
8.
This applies for both power on and power off, refer to ANSI standard RS-485 for exact condition. The EIA/TIA-422-B limit does not apply
for a combined driver and receiver terminal.
9.
Includes 10 ns read enable time. Maximum propagation delay is 25 ns after read assertion.
10. Pulse skew is defined as |tPLH – tPHL| of each channel.
11. Absolute Maximum specifications mean the device will not be damaged if operated under these conditions. It does not guarantee
performance.
12. The relevant test and measurement methods are given in the Electromagnetic Compatibility section on p. 6.
13. External magnetic field immunity is improved by this factor if the field direction is “end-to-end” rather than to “pin-to-pin” (see diagram on p. 6).
6
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
©NVE Corporation
IL3085
Receiver Section
Electrical Specifications (Tmin to Tmax and VDD = 4.5 V to 5.5 V unless otherwise stated)
Typ.(5)
Parameter
Symbol
Min.
Max.
Units
Positive-going Input Threshold
0.2
V
VIT+
Voltage
Negative-going Input Threshold
−0.2
V
VIT−
Voltage
Hysteresis Voltage (VIT+ − VIT−)
VHYS
70
mV
High Level Digital Output Voltage
VOH
Low Level Digital Output Voltage
VOL
0.2
V
High-impedance-state output current
Line Input Current(8)
IOZ
II
±1
1
−0.8
Input Resistance
RI
μA
mA
mA
kΩ
Supply Current
VDD – 0.2
VDD
V
12
IDD2
5
16
mA
Max.
Units
Mbps
Test Conditions
−7 V < VCM < 12 V
−7 V < VCM < 12 V
VCM = 0 V, T = 25°C
VID = 200 mV
IOH = −20 μA
VID = −200 mV
IOH = 20 μA
VO = 0.4 to (VDD2−0.5) V
VI = 12 V
VI = −7 V
No load; Outputs
Enabled; VDD2X
connected to VDD2I if
applicable
Switching Characteristics
Parameter
Data Rate
Symbol
Propagation Delay(2, 9)
Pulse Skew(2, 10)
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
Common Mode Transient Immunity
(Output Logic High to Logic Low)
Parameter
Data Rate
tPD
48
150
ns
tSK(P)
6
15
ns
tPZH
tPZL
tPHZ
tPLZ
33
33
33
33
50
50
50
50
ns
ns
ns
ns
|CMH|,|CML|
Symbol
Propagation Delay(2, 9)
Pulse Skew(2, 10)
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High
Level
Output Disable Time From Low Level
Common Mode Transient Immunity
(Output Logic High to Logic Low)
VDD1 = 5 V, VDD2 = 5 V
Typ.(5)
Min.
4
30
50
kV/μs
VDD1 = 3.3 V, VDD2 = 5 V
Typ.(5)
Min.
4
tPD
48
150
ns
tSK(P)
6
20
ns
tPZH
tPZL
33
33
50
50
ns
ns
Test Conditions
RL = 54 Ω, CL = 50 pF
VO = −1.5 to 1.5 V,
CL = 15 pF
VO = −1.5 to 1.5 V,
CL = 15 pF
CL = 15 pF
CL = 15 pF
tPHZ
33
50
ns
CL = 15 pF
tPLZ
33
50
ns
CL = 15 pF
VCM = 1500 VDC
tTRANSIENT = 25 ns
|CMH|,|CML|
30
Max.
Units
Mbps
Test Conditions
RL = 54 Ω, CL = 50 pF
VO = −1.5 to 1.5 V,
CL = 15 pF
VO = −1.5 to 1.5 V,
CL = 15 pF
CL = 15 pF
CL = 15 pF
CL = 15 pF
CL = 15 pF
VCM = 1500 VDC
tTRANSIENT = 25 ns
50
kV/μs
7
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
©NVE Corporation
IL3085
Magnetic Field Immunity(12)
Power Frequency Magnetic Immunity
Pulse Magnetic Field Immunity
Damped Oscillatory Magnetic Field
Cross-axis Immunity Multiplier(13)
HPF
HPM
HOSC
KX
Power Frequency Magnetic Immunity
Pulse Magnetic Field Immunity
Damped Oscillatory Magnetic Field
Cross-axis Immunity Multiplier(13)
HPF
HPM
HOSC
KX
VDD1 = 5 V, VDD2 = 5 V
3500
4500
4500
2.5
VDD1 = 3.3 V, VDD2 = 5 V
1500
2000
2000
2.5
A/m
A/m
A/m
50Hz/60Hz
tp = 8µs
0.1Hz – 1MHz
A/m
A/m
A/m
50Hz/60Hz
tp = 8µs
0.1Hz – 1MHz
8
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
©NVE Corporation
IL3085
Electrostatic Discharge Sensitivity
This product has been tested for electrostatic sensitivity to the limits stated in the specifications. However, NVE recommends that all integrated
circuits be handled with appropriate care to avoid damage. Damage caused by inappropriate handling or storage could range from performance
degradation to complete failure.
Pinout Differences Between Packages
QSOP and narrow-body version (IL3085-1E and IL3085-3E) are designed for application flexibility and minimum board area in dense PCAs.
The wide-body version (IL3085E) has redundant ground pins for layout flexibility.
QSOP and narrow-body versions provide separate isolated DE output (ISODE) and Transceiver Device Enable (XDE) input. ISODE follows the
Device Enable input (DE). XDE can be used to enable and disable the transceiver from the bus side, or connected to ISODE to enable and disable
the transceiver from the DE controller-side input. The QSOP and narrow-body versions also provide separate bus-side power supply pins—
VDD2X for the transceiver module and VDD2I for the isolation module. These should be externally connected for normal operation, but can be used
separately for testing or troubleshooting. The QSOP version also has an “ISOR” output that is isolated with respect to the controller-side “R.”
This pin is used for testing and normally not connected, but could be used for a bus-side data output under special circumstances.
The wide-body version has internal connections between the isolated DE output and the Transceiver Device Enable input, and well as between
the two VDD2 bus-side power supply pins. The two internally-connected GND pins for each supply side provide layout flexibility. The ISODE
output can be used in PROFIBUS applications where the state of the isolated drive enable node needs to be monitored, or for testing or
troubleshooting.
Dynamic Power Consumption
IsoLoop Isolators have low power consumption because data is transmitted across the isolation barrier only on edge transitions. Power
consumption therefore varies with the data rate. Typical dynamic supply currents are as follows:
Data Rate (Mbps)
1
4
IDD1
150 μA
600 μA
IDD2
150 μA
600 μA
Table 2. Typical Dynamic Supply Currents.
Power Supply Decoupling
Both VDD1 and VDD2 must be bypassed with 47 nF ceramic capacitors. These should be placed as close as possible to VDD pins for proper
operation. Additionally, VDD2 should be bypassed with a 10 µF tantalum capacitor.
Maintaining Creepage
Creepage distances are often critical in isolated circuits. In addition to meeting JEDEC standards, NVE isolator packages have unique creepage
specifications. Standard pad libraries often extend under the package, compromising creepage and clearance. Similarly, ground planes, if used,
should be spaced to avoid compromising clearance. Package drawings and recommended pad layouts are included in this datasheet.
DC Correctness
The IL3085 incorporates a patented refresh circuit to maintain the correct output state with respect to data input. At power up, the bus outputs
will follow the Function Table shown on Page 1. The DE input should be held low during power-up to eliminate false drive data pulses from the
bus. An external power supply monitor to minimize glitches caused by slow power-up and power-down transients is not required.
Electromagnetic Compatibility
The IL3085 is fully compliant with generic EMC standards EN50081, EN50082-1 and the umbrella line-voltage standard for Information
Technology Equipment (ITE) EN61000. The IsoLoop Isolator’s Wheatstone bridge configuration and differential magnetic field signaling ensure
excellent EMC performance against all relevant standards. NVE conducted compliance tests in the categories below:
EN50081-1
Residential, Commercial & Light Industrial
Methods EN55022, EN55014
EN50082-2: Industrial Environment
Methods EN61000-4-2 (ESD), EN61000-4-3 (Electromagnetic Field Immunity), EN61000-4-4 (Electrical Transient Immunity),
EN61000-4-6 (RFI Immunity), EN61000-4-8 (Power Frequency Magnetic Field Immunity)
ENV50204
Radiated Field from Digital Telephones (Immunity Test)
Immunity to external magnetic fields is even higher if the field direction is “end-to-end” (rather than to “pin-to-pin”) as shown above.
9
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
©NVE Corporation
IL3085
Application Information
Figures 1a, 1b, and 1c show typical connections to a bus and microcontroller for the three package versions. The schematics include typical
termination and fail-safe resistors, and power supply decoupling capacitors:
VDD2 = 5 V
VDD1 = 3.3 V
+ C DD2B
C DD2
C DD1
47nF
DE
5
D
6
R
2
RE
4
IL3085-1
47nF
11 16
10µF
15 ISODE
12
XDE
R FS-EXT
560R
A
9
10
ISOR
13
3
GND1
14
Isolation
Boundary
Microcontroller
1
RT
120R
B
R FS-EXT
560R
GND2
Figure 1a. Typical QSOP transceiver connections.
VDD2 = 5 V
VDD1 = 3.3 V
+ C DD2B
C DD2
C DD1
47nF
1
47nF
13 16
10µF
14 ISODE
6
10
D
5
R
3
RE
4
XDE
R FS-EXT
560R
A
11
12
RT
120R
B
2
GND1
R FS-EXT
560R
15
Isolation
Boundary
Microcontroller
DE
IL3085-3
GND2
Figure 1b. Typical narrow-body connections.
VDD2 = 5 V
VDD1 = 3.3 V
C DD2
C DD1
47nF
1
5
+ C DD2B
47nF
16
10µF
10
ISODE
D
6
R
3
RE
4
R FS-EXT
560R
12
13
2 or 8
GND1
A
RT
120R
B
Isolation
Boundary
Microcontroller
DE
IL3085
9 or 15
R FS-EXT
560R
GND2
Figure 1c. Typical wide-body connections.
10
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
©NVE Corporation
IL3085
Receiver Features
The receiver output “R” has tri-state capability via the active low RE input.
Driver Features
The RS-485 driver has a differential output and delivers at least 2.1 V across a 54 Ω load. Drivers feature low propagation delay skew to
maximize bit width and minimize EMI. Drivers have tri-state capability via the active-high DE input.
Receiver Data Rate, Cables and Terminations
The IL3085 is intended for networks up to 4,000 feet (1,200 m), but the maximum data rate decreases as cable length increases. Twisted pair
cable should be used in all networks since they tend to pick up noise and other electromagnetically induced voltages as common mode signals,
which are effectively rejected by the differential receiver.
Fail-Safe Operation
“Fail-safe operation” is defined here as the forcing of a logic high state on the “R” output in response to an open-circuit condition between the
“A” and “B” lines of the bus, or when no drivers are active on the bus.
Proper biasing can ensure fail-safe operation, that is a known state when there are no active drivers on the bus. IL3000-Series Isolated
Transceivers include internal pull-up and pull-down resistors of approximately 30 kΩ in the receiver section (RFS-INT; see figure below). These
internal resistors are designed to ensure failsafe operation but only if there are no termination resistors. The entire VDD will appear between inputs
“A” and “B” if there is no loading and no termination resistors, and there will be more than the required 200 mV with up to four RS-485 worstcase Unit Loads of 12 kΩ. Many designs operating below 1 Mbps or less than 1,000 feet are unterminated. Termination resistors may not be
necessary for very low data rates and very short cable runs because reflections have time to settle before data sampling, which occurs at the
middle of the bit interval.
In busses with low-impedance termination resistors however, the differential voltage across the conductor pair will be close to zero with no active
drivers. In this case the state of the bus is indeterminate, and the idle bus will be susceptible to noise. For example, with 120 Ω termination
resistors (RT) on each end of the cable, and four Unit Loads (12 kΩ each), without external fail-safe biasing resistors the internal pull-up and pulldown resistors will produce a voltage between inputs “A” and “B” of only about 5 mV. This is not nearly enough to ensure a known state.
External fail-safe biasing resistors (RFS-EXT) at one end of the bus can ensure fail-safe operation with a terminated bus. Resistors should be
selected so that under worst-case power supply and resistor tolerances there is at least 200 mV across the conductor pair with no active drivers to
meet the input sensitivity specification of the RS-485 standard.
Using the same value for pull-up and pull-down biasing resistors maintains balance for positive- and negative going transitions. Lower-value
resistors increase inactive noise immunity at the expense of quiescent power consumption. Note that each Unit Load on the bus adds a worst-case
loading of 12 kΩ across the conductor pair, and 32 Unit Loads add 375 Ω worst-case loading. The more loads on the bus, the lower the required
values of the biasing resistors.
In the example with two 120 Ω termination resistors and four Unit Loads, 560 Ω external biasing resistors provide more than 200 mV between
“A” and “B” with adequate margin for power supply variations and resistor tolerances. This ensures a known state when there are no active
drivers. Other illustrative examples are shown in the following table:
11
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IL3085
Fail-Safe Biasing
5V
30K
RFS-INT
RT
RT
None
120 Ω
120 Ω
120 Ω
B
RFS-EXT
30K
RFS-INT
GND
RFS-EXT
Internal Only
Internal Only
560 Ω
510 Ω
A
RT
R
RFS-EXT
VDD
Loading
Four unit loads (12 kΩ ea.)
Four unit loads (12 kΩ ea.)
Four unit loads (12 kΩ ea.)
32 unit loads (12 kΩ ea.)
Nominal VA-B Fail-Safe
Operation?
(inactive)
238 mV
Yes
5 mV
No
254 mV
Yes
247 mV
Yes
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IL3085
Package Drawings
Ultraminiature 16-pin QSOP Package (-1 suffix)
Dimensions in inches (mm); scale = approx. 5X
0.188 (4.77)
0.197 (5.00)
0.020 (0.50)
0.029 (0.75)
0.050 (1.27)
0.056 (1.42)
0.060 (1.52)
0.069 (1.75)
0.150 (3.8)
0.157 (4.0)
0.228 (5.8)
0.244 (6.2)
0.004 (0.10)
0.010 (0.25)
0.025 (0.635)
NOM
NOTE: Pin spacing is a BASIC
dimension; tolerances
do not accumulate
0.007 (0.20)
0.010 (0.25)
0.013 (0.3)
0.020 (0.5)
0.15" 16-pin SOIC Package (-3 suffix)
Dimensions in inches (mm); scale = approx. 5X
0.013 (0.3)
0.020 (0.5)
NOM
0.007 (0.2)
0.013 (0.3)
0.386 (9.8)
0.394 (10.0)
Pin 1 identified
by either an
indent or a
marked dot
0.016 (0.4)
0.050 (1.3)
0.055 (1.40)
0.062 (1.58)
0.054 (1.4)
0.072 (1.8)
0.150 (3.81)
0.157 (3.99)
0.049 (1.24)
0.051 (1.30)
0.228 (5.8)
0.244 (6.2)
NOTE: Pin spacing is a BASIC
dimension; tolerances
do not accumulate
0.004 (0.1)
0.012 (0.3)
13
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IL3085
0.3" 16-pin SOIC Package (no suffix)
Dimensions in inches (mm); scale = approx. 5X
0.033 (0.85)*
0.043 (1.10)
0.260 (6.60)*
0.280 (7.11)
0.013 (0.3)
0.020 (0.5)
0.007 (0.2)
0.013 (0.3)
0.397 (10.08)
0.413 (10.49)
0.017 (0.43)*
0.022 (0.56)
0.016 (0.4)
0.050 (1.3)
0.007 (0.18)*
0.010 (0.25)
0.092 (2.34)
0.105 (2.67)
Pin 1 identified by
either an indent
or a marked dot
0.08 (2.0)
0.10 (2.5)
0.292 (7.42)*
0.299 (7.59)
0.049 (1.24)
0.051 (1.30)
0.394 (10.00)
0.419 (10.64)
NOTE: Pin spacing is a BASIC
dimension; tolerances
do not accumulate
*Specified for True 8™ package to guarantee 8 mm creepage per IEC 60601.
0.004 (0.1)
0.012 (0.3)
14
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IL3085
Recommended Pad Layouts
4 mm x 5 mm 16-pin QSOP Pad Layout
Dimensions in inches (mm); scale = approx. 5X
0.160 (4.05)
0.025 (0.635)
0.012 (0.30)
16 PLCS
0.275 (6.99)
0.15" 16-pin SOIC Pad Layout
Dimensions in inches (mm); scale = approx. 5X
0.160 (4.06)
0.050 (1.27)
0.020 (0.51)
16 PLCS
0.275 (6.99)
15
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IL3085
0.3" 16-pin SOIC Pad Layout
Dimensions in inches (mm); scale = approx. 5X
0.317 (8.05)
0.050 (1.27)
0.020 (0.51)
16 PLCS
0.449 (11.40)
16
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IL3085
Ordering Information and Valid Part Numbers
IL 30 85 -3 E TR13
Valid Part Numbers
IL3085E
IL3085E TR13
IL3085-3E
IL3085-3E TR7
IL3085-3E TR13
IL3085-1E
IL3085-1E TR7
IL3085-1E TR13
Bulk Packaging
Blank = Tube
TR7 = 7'' Tape and Reel
TR13 = 13'' Tape and Reel
Package
E = RoHS Compliant
Package Type
Blank = 0.3'' SOIC
-3 = 0.15'' SOIC
-1 = 0.15'' QSOP
Channel Configuration
85 = RS-485
Base Part Number
30 = Digital-In, 4 Mbps Transceiver
Product Family
IL = Isolators
RoHS
COMPLIANT
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IL3085
Revision History
ISB-DS-001-IL3085-H
December 2017
Change
ISB-DS-001-IL3085-G
Change
•
•
ISB-DS-001-IL3085-F
ISB-DS-001-IL3085-D
ISB-DS-001-IL3085-C
ISB-DS-001-IL3085-B
ISB-DS-001-IL3085-A
December 2012
Updated from IEC 60747-5-5 (VDE 0884) certification to VDE V 0884-10.
Change
•
ISB-DS-001-IL3085-E
Improved thermal specifications based on new test data (p. 2).
Increased IL3085-1E (QSOP) creepage specification from 2.75 mm to 3.2 mm (p. 2).
Change
•
Added QSOP version (-1 suffix).
•
Revised and added details to thermal characteristic specifications (p. 2).
•
Added VDE 0884 Safety-Limiting Values (p. 3).
Change
•
IEC 60747-5-5 (VDE 0884) certification.
•
Upgraded from MSL 2 to MSL 1.
Change
•
Increased transient immunity specifications based on additional data.
•
Noted UL 1577 recognition, IEC 61010-1 approval, and VDE 0884 pending.
•
Added transient immunity specifications.
•
Added high voltage endurance specification.
•
Increased magnetic immunity specifications.
•
Updated package outline drawings and added recommended solder pad dimensions.
Change
•
Added thermal characteristics (p. 2).
•
Finalized maximum data rate (4 Mbps).
•
Cosmetic changes.
Change
• Initial Release.
18
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IL3085
Datasheet Limitations
The information and data provided in datasheets shall define the specification of the product as agreed between NVE and its customer, unless NVE and
customer have explicitly agreed otherwise in writing. All specifications are based on NVE test protocols. In no event however, shall an agreement be
valid in which the NVE product is deemed to offer functions and qualities beyond those described in the datasheet.
Limited Warranty and Liability
Information in this document is believed to be accurate and reliable. However, NVE does not give any representations or warranties, expressed or
implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information.
In no event shall NVE be liable for any indirect, incidental, punitive, special or consequential damages (including, without limitation, lost profits, lost
savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on
tort (including negligence), warranty, breach of contract or any other legal theory.
Right to Make Changes
NVE reserves the right to make changes to information published in this document including, without limitation, specifications and product descriptions
at any time and without notice. This document supersedes and replaces all information supplied prior to its publication.
Use in Life-Critical or Safety-Critical Applications
Unless NVE and a customer explicitly agree otherwise in writing, NVE products are not designed, authorized or warranted to be suitable for use in life
support, life-critical or safety-critical devices or equipment. NVE accepts no liability for inclusion or use of NVE products in such applications and such
inclusion or use is at the customer’s own risk. Should the customer use NVE products for such application whether authorized by NVE or not, the
customer shall indemnify and hold NVE harmless against all claims and damages.
Applications
Applications described in this datasheet are illustrative only. NVE makes no representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and operation of their applications and products using NVE products, and NVE accepts no liability for any
assistance with applications or customer product design. It is customer’s sole responsibility to determine whether the NVE product is suitable and fit for
the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customers. Customers should
provide appropriate design and operating safeguards to minimize the risks associated with their applications and products.
NVE does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s
applications or products, or the application or use by customer’s third party customers. The customer is responsible for all necessary testing for the
customer’s applications and products using NVE products in order to avoid a default of the applications and the products or of the application or use by
customer’s third party customers. NVE accepts no liability in this respect.
Limiting Values
Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the
device. Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the recommended
operating conditions of the datasheet is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the
quality and reliability of the device.
Terms and Conditions of Sale
In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. NVE hereby expressly objects to
applying the customer’s general terms and conditions with regard to the purchase of NVE products by customer.
No Offer to Sell or License
Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication
of any license under any copyrights, patents or other industrial or intellectual property rights.
Export Control
This document as well as the items described herein may be subject to export control regulations. Export might require a prior authorization from national authorities.
Automotive Qualified Products
Unless the datasheet expressly states that a specific NVE product is automotive qualified, the product is not suitable for automotive use. It is neither
qualified nor tested in accordance with automotive testing or application requirements. NVE accepts no liability for inclusion or use of non-automotive
qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall
use the product without NVE’s warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the
product for automotive applications beyond NVE’s specifications such use shall be solely at customer’s own risk, and (c) customer fully indemnifies
NVE for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NVE’s
standard warranty and NVE’s product specifications.
19
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IL3085
An ISO 9001 Certified Company
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
www.nve.com
e-mail: iso-info@nve.com
©NVE Corporation
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
ISB-DS-001-IL3085-H
December 2017
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