IL3685
Advanced Isolated RS-485 Transceivers
Functional Diagrams
DE
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
ISODE
D
A
B
ISORO
ISORI
R
RE
IL3685-1
(QSOP)
DE
ISODE
Applications
XDE
•
•
•
•
•
D
A
B
R
40 Mbps data rate
3 V to 5 V power supplies
20 ns propagation delay
Hot-plug capable
50 kV/μs typ.; 30 kV/μs min. common mode transient immunity
44000 year barrier life
15 kV bus ESD protection
Low EMC footprint
Thermal shutdown protection
PROFIBUS compliant
6 kVRMS Reinforced Isolation; 1.2 kVRMS Working Voltage (IL3685VE)
IEC 60747-17 (VDE 0884-17):2021-10 certified; UL 1577 recognized
ATEX / IECEx certified for IS-to-IS intrinsically safe applications
QSOP, 0.15", or 0.3" 16-pin packages
RE
PROFIBUS, PROFIBUS DP, and FMS networks
Factory automation
Industrial control networks
Building environmental controls
Equipment covered under IEC 61010-1 Edition 3
Description
IL3685-Series are second-generation isolated, high-speed
differential bus transceivers. The devices use NVE’s patented*
spintronic Giant Magnetoresistance (GMR) technology and have
advanced features such as hot-plug capability and PROFIBUS
compliance.
IL3685-3
(narrow-body)
DE
ISODE
The wide-body version provides true 8 mm creepage. Narrow-body
and QSOP packages offer unprecedented miniaturization.
D
A unique ceramic/polymer composite barrier provides excellent
isolation and virtually unlimited barrier life.
A
B
R
The device is compatible with 3 V as well as 5 V input supplies,
allowing interface to standard microcontrollers without additional
level shifting.
RE
IL3685
(wide-body)
VID (A-B)
≥ 200 mV
≤−200mV
Open
≥ 1.5 V
≤−1.5 V
≥ 1.5 V
≤−1.5 V
DE
L
L
L
H
H
H
H
RE
L
L
L
L
L
H
H
R
H
L
H
H
L
Z
Z
D
X
X
X
H
L
H
L
X
L
H
Z
X
Mode
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.
Notes
Receive
Drive
Disabled
A/B failsafe
R reads back
D information
R tri-state
(no output)
R tri-state;
A/B failsafe
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. Z
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
iso-apps@nve.com
IL3685
Absolute Maximum Ratings(7)
Parameter
Storage Temperature
Junction 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
VDD1, VDD2
Min.
−55
−55
Typ.
−7
−0.5
−0.5
−0.5
15
Max.
150
150
Units
°C
°C
12
7
VDD + 0.5
VDD + 1
V
V
V
V
kV
Test Conditions
HBM
Recommended Operating Conditions
Parameter
Ambient Operating Temperature
Junction Temperature
Symbol
VDD1
VDD2
TA
TJ
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)
Digital Input Signal Rise and Fall Times
VIL
VID
IOH
Supply Voltage
Min.
3.0
4.5
−40
−40
2.4
3.0
0
Typ.
IOH
Max.
5.5
5.5
85
100
Units
VDD1
V
0.8
+12 / −7
60
V
V
mA
8
mA
V
°C
°C
IOL
−60
mA
IOL
−8
mA
tIR, tIF
Test Conditions
VDD1 = 3.3 V
VDD1 = 5.0 V
DC Stable
2
NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617(952) 829-9217
www.nve.com
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iso-apps@nve.com
IL3685
Safety and Approvals
IEC 60747-17 (VDE 0884-17):2021-10:
IL3685VE version (Reinforced Isolation; VDE File Number 5016933-4880-0002)
• Working Voltage (VIORM): 1200 VRMS (1700 VPK) with 20% Safety Factor; pollution degree 2
• Isolation voltage (VISO): 6000 VRMS
• Surge immunity (VIOSM): 12.8 kVPK
• Surge rating: 8000 V
• Transient overvoltage (VIOTM): 6000 VPK
• Each part tested at 2387 VPK for 1 second, 5 pC partial discharge limit
• Samples tested at 6000 VPK for 60 sec.; then 2122 VPK for 10 sec. with 5 pC partial discharge limit
Standard versions (Basic Isolation; VDE File Number 5016933-4880-0001)
• 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.
• Working Voltage (VIORM; pollution degree 2):
Package
QSOP16
Narrow-body SOIC16
Wide-body SOIC16/True 8™
Part No.
Suffix
-1
-3
None
Safety-Limiting Values
Safety rating ambient temperature
Safety rating power (180 °C)
Supply current safety rating (total of supplies)
Working
Voltage
600 VRMS
700 VRMS
600 VRMS
Symbol
TS
PS
IS
Value
180
270
54
Units
°C
mW
mA
UL 1577 (Component Recognition Program File Number E207481)
Standard isolation grade
2500 V rating; each part tested at 3000 VRMS (4243 VPK) for 1 second; each lot sample tested at 2500 VRMS (3536 VPK) for 1 minute.
V-Series isolation grade
6 kV rating; each part tested at 7.2 kVRMS (10.2 kVPK) for 1 second; each lot sample tested at 6 kVRMS (8485 VPK) for 1 minute.
Intrinsically Safe Certification
• IL3685VE is ATEX / IEC 60079-0 / 60079-11 certified Intrinsically Safe (IS) for use in IS to IS applications.
• 500 VRMS rating.
Soldering Profile
Per JEDEC J-STD-020C, MSL 1
3
NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617(952) 829-9217
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IL3685
IL3685-1 (QSOP Package) Pin Connections
1
VDD1
2
R
Input power supply.
3
GND1
Input power supply ground return.
4
RE
Read data enable
(if RE is high, R= high impedance).
5
DE
Drive enable (HIGH if left unconnected).
6
D
7, 8
NC
9
B
10
VDD2X
11
A
Output data from bus.
Data input to bus.
No internal connection.
Inverting bus line.
Output transceiver power supply
(normally connected to pin 16).
Non-inverting bus line.
12
ISORO
Isolated R output (should be externally
connected to pin 15; no other connection
should be made).
13
ISODE
Isolated DE output.
14
GND2
Output power supply ground return.
15
ISORI
Isolated R input (should be connected to pin
12; no other connection should be made).
16
VDD2I
Output isolation power supply
(normally connected to pin 10).
VDD1
1
16
VDD2
R
2
15
ISORI
GND1
3
14
GND2
RE
4
13
ISODE
DE
5
12
ISORO
D
6
11
A
NC
7
10
VDD2X
NC
8
9
B
IL3685-1
IL3685-3 (0.15" Narrow-Body SOIC) 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 (HIGH if left unconnected).
7, 8
NC
No internal connection.
9
GND2X
10
XDE
Output data from bus.
Output transceiver ground return.
(normally connected to pin 15).
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).
VDD1
1
16
VDD2I
GND1
2
15
GND2I
R
3
14
ISODE
RE
4
13
VDD2X
D
5
12
B
DE
6
11
A
11
A
Non-inverting bus line.
NC
7
10
XDE
12
B
Inverting bus line.
NC
8
9
GND2X
VDD2X
Output transceiver power supply
(normally connected to pin 16).
14
ISODE
Isolated DE output
(normally connected to pin 10).
15
GND2I
Output isolation power supply ground return.
(normally connected to pin 9).
16
VDD2I
Output isolation power supply
(normally connected to pin 13).
13
IL3685-3
4
NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617(952) 829-9217
www.nve.com
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IL3685
IL3685 (0.3" SOIC Wide-Body SOIC) 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 (HIGH if left unconnected).
VDD1
1
16
VDD2
Data input to bus.
GND1
2
15
GND2
Output data from bus.
6
D
7
NC
3
14
NC
GND1
Input power supply ground return
(pin 8 is internally connected to pin 2).
R
8
RE
4
13
B
9
GND2
Output power supply ground return
(pin 9 is internally connected to pin 15).
DE
5
12
A
10
ISODE
Isolated DE output for use in PROFIBUS
applications where the state of the isolated
drive enable node needs to be monitored.
D
6
11
NC
NC
7
10
ISODE
GND1
8
9
GND2
No internal connection.
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.
IL3685
No internal connection.
5
NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
iso-apps@nve.com
IL3685
Driver Section
Electrical Specifications (Tmin to Tmax and VDD = 4.5 V to 5.5 V unless otherwise stated)
Parameter
Symbol
Min.
Typ.
Max.
Units
Output voltage
VO
VDD
V
Differential Output Voltage(2)
|VOD1|
VDD
V
Differential Output Voltage(2)
|VOD2|
2.1
3
3.5
V
Differential Output Voltage(2)
Change in Magnitude of Differential
Output Voltage(4)
Common Mode Output Voltage
Change in Magnitude of Common
Mode Output Voltage(4)
High Level Input Current
Low Level Input Current
Absolute |Short-circuit Output Current|
VOD3
1.9
Test Conditions
IO = 0
IO = 0
RL = 54 Ω
−7 V < VCM < 12 V;
RL = 60 Ω
3.5
V
Δ|VOD|
±0.2
V
RL = 54 Ω or 100 Ω
VOC
3
V
RL = 54 Ω or 100 Ω
Δ|VOC|
±0.2
V
RL = 54 Ω or 100 Ω
IIH
IIL
IOS
10
−10
250
μA
μA
mA
VI = 3.5 V
VI = 0.4 V
−7 V < VO < 12 V
Receiver Section
Electrical Specifications (Tmin to Tmax and VDD = 4.5 V to 5.5 V unless otherwise stated)
Parameter
Symbol
Min.
Typ.
Max.
Units
Positive-going Input Threshold
VIT+
0.2
V
Voltage
Negative-going Input Threshold
VIT−
−0.2
V
Voltage
Hysteresis Voltage (VIT+ − VIT−)
VHYS
28
mV
Differential Bus Input Capacitance
CD
9
12
pF
High Level Digital Output Voltage
VOH
Low Level Digital Output Voltage
VOL
0.2
V
High-impedance-state output current
Line Input Current
IOZ
II
±1
220
−160
Input Resistance
Bus-Side Supply Current
RI
IDD2
μA
μA
μA
kΩ
mA
Bus-Side Dynamic Supply Current
VDD – 0.2
VDD
V
54
5
1
0.8
ΔIDD2/ΔfIN
16
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
RT = ∞
RT = 60 Ω
Power Consumption
Parameter
Controller-Side
Quiescent Current
VDD1 = 3.3 V
VDD1 = 5 V
Tmin to Tmax and VDD2 = 5 V unless otherwise stated
Symbol
Min.
Typ.
Max.
3
4
IDD1
4
6
Bus-Side Quiescent Supply Current
IDD2
5
Controller-Side Dynamic Supply Current
IDD1
0.22
1
0.8
Bus-Side Dynamic Supply Current
ΔIDD2/ΔfIN
16
Units
mA
mA
mA/Mbps
Test Conditions
fIN = 0 Hz
Outputs Enabled;
RT = ∞; fIN = 0 Hz ;
VDD2X connected to VDD2I
if applicable
VDD1 = 3.3 V
RT = ∞
RT = 60 Ω
6
NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617(952) 829-9217
www.nve.com
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IL3685
Switching Characteristics
Parameter
Data Rate
Propagation Delay(5)
Pulse Skew(6)
Limit(3)
Skew
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
Propagation Delay(5)
Pulse Skew(6)
Limit(3)
Skew
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)
Symbol
VDD1 = 5 V, VDD2 = 5 V
Min.
Typ.
40
Max.
Units
Mbps
tPD
20
30
ns
tSK(P)
1
5
ns
tSK(LIM)
tPZH
tPZL
tPHZ
tPLZ
2
15
15
15
15
10
30
30
30
30
ns
ns
ns
ns
ns
|CMH|,|CML|
Symbol
30
50
VDD1 = 3.3 V, VDD2 = 5 V
Min.
Typ.
40
kV/μs
Max.
Units
Mbps
tPD
25
35
ns
tSK(P)
2
5
ns
tSK(LIM)
tPZH
tPZL
tPHZ
tPLZ
4
17
17
17
17
10
30
30
30
30
ns
ns
ns
ns
ns
|CMH|,|CML|
30
50
kV/μs
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
RL = 54 Ω, CL = 50 pF
CL = 15 pF
CL= 15 pF
CL = 15 pF
CL = 15 pF
VCM = 1500 VDC
tTRANSIENT = 25 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
RL = 54 Ω, CL = 50 pF
CL = 15 pF
CL= 15 pF
CL = 15 pF
CL = 15 pF
VCM = 1500 VDC
tTRANSIENT = 25 ns
7
NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617(952) 829-9217
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IL3685
Magnetic Field Immunity(8)
Power Frequency Magnetic Immunity
Pulse Magnetic Field Immunity
Damped Oscillatory Magnetic Field
Cross-axis Immunity Multiplier(9)
HPF
HPM
HOSC
KX
Power Frequency Magnetic Immunity
Pulse Magnetic Field Immunity
Damped Oscillatory Magnetic Field
Cross-axis Immunity Multiplier(9)
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
Insulation Specifications
Parameter
Symbol
IL3685-1E
Creepage Distance
IL3685-3E
(external)
IL3685E
Total Barrier Thickness (internal)
Barrier Resistance
Barrier Capacitance
Leakage Current
Comparative Tracking Index
High Voltage Endurance
AC
(Maximum Barrier Voltage
for Indefinite Life)
DC
Surge Immunity (“V” Version)
Min.
3.2
4.0
8.03
0.013
Max.
Units
Per IEC 60601
≥600
1000
1500
12.8
VDC
kVPK
VIO
VIOSM
Barrier Life
Test Conditions
mm
8.3
0.016
>1014
7
0.2
mm
Ω
pF
μARMS
VRMS
VRMS
RIO
CIO
CTI
Typ.
44000
Years
500 V
f = 1 MHz
240 VRMS, 60 Hz
Per IEC 60112
At maximum
operating temperature
Per IEC 61000-4-5
100°C, 1000 VRMS, 60%
CL activation energy
Thermal Characteristics
Parameter
Junction–Ambient
Thermal Resistance
Junction–Case (Top)
Thermal Resistance
Symbol
QSOP
0.15" SOIC
0.3" SOIC
QSOP
0.15" SOIC
0.3" SOIC
Junction–Ambient
Thermal Resistance
Junction–Case (Top)
Thermal Resistance
0.3" SOIC
Power Dissipation
QSOP
0.15" SOIC
0.3" SOIC
Min.
θJA
θJC
Typ.
100
82
67
9
8
12
θJA
46
θJC
9
Max.
Test Conditions
Double-sided PCB in
free air
°C/W
2s2p PCB in free air
per JESD51
675
700
1500
PD
Units
mW
8
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IL3685
Notes:
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.
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.
5.
Includes 10 ns read enable time. Maximum propagation delay is 25 ns after read assertion.
6.
Pulse skew is defined as |tPLH – tPHL| of each channel.
7.
Absolute Maximum specifications mean the device will not be damaged if operated under these conditions. It does not guarantee
performance.
8.
The relevant test and measurement methods are given in the Electromagnetic Compatibility section.
9.
External magnetic field immunity is improved by this factor if the field direction is “end-to-end” rather than to “pin-to-pin.”
9
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
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YouTube.com/NveCorporation
iso-apps@nve.com
IL3685
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
The QSOP (IL3685-1E) and narrow-body (IL3685-3E) versions are designed for minimum board area in densely-populated PCAs. Both have pin
sets that should be connected externally for normal operation, but that can be used for testing, trouble-shooting, or special purposes. The widebody version (IL3685E) has redundant ground pins for layout flexibility.
The narrow-body version provides a 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 “ISORI” input that can be used to test the controller-side “R” from the
bus side. ISORI should be connected externally to “ISORO” for normal operation. ISORI and ISORO can be used for testing.
The wide-body version has internal connections between the isolated DE output and the Transceiver Device Enable input, and well as between
the two bus-side power supplies.
Power Supply Decoupling
VDD1 and VDD2 should be bypassed with 0.1 µF typical (47 nF minimum) capacitors as close as possible to the VDD pins.
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.
Electromagnetic Compatibility
IL3685-Series Transceivers are fully compliant with IEC 61000-6-1 and IEC 61000-6-2 standards for immunity, and IEC 61000-6-3,
IEC 61000-6-4, CISPR, and FCC Class A standards for emissions.
The IsoLoop Isolator’s Wheatstone bridge configuration and differential magnetic field signaling ensure excellent EM immunity.
Immunity to external magnetic fields is even higher if the field direction is “end-to-end” (rather than to “pin-to-pin”) as shown at
right.
10
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
(952) 829-9217
www.nve.com
YouTube.com/NveCorporation
iso-apps@nve.com
IL3685
Application Information
Figures 1a, 1b, and 1c show typical connections to a bus and microcontroller for the three package versions, including external connections
required for normal operation. Typical termination resistors, fail-safe resistors, and power supply decoupling capacitors are also included:
VDD2 = 5 V
VDD1 = 3.3 V
C DD2
C DD1
0.1 µF
1
DE
IL3685-1
0.1 µF
10 16
13 ISODE
5
Microcontroller
CNTR-P
D
6
R
2
RE
4
R FS-EXT
560
A
11
9
12
15
GND1
B
R FS-EXT
560
14
Isolation
Boundary
3
RT
120
GND2
Figure 1a. Typical QSOP transceiver connections.
VDD2 = 5 V
VDD1 = 3.3 V
0.1 µF
0.1 µF
DE
6
D
5
R
3
IL3685-3
13 16
14 ISODE
15
GND2I
10
CNTR-P
XDE
R FS-EXT
390
11
RT
220
12
RE
4
2
GND1
Isolation
Boundary
Microcontroller
1
A
B
R FS-EXT
390
9 GND2X
GND2
Figure 1b. Typical narrow-body transceiver connections.
VDD2 = 5 V
VDD1 = 3.3 V
47
nF
47 nF
1
DE
IL3685
+ 10 µF
16
ISODE
5
CNTR-P
D
R
R FS-EXT
390
6
12
3
RT
220
13
RE
4
2 or 8
GND1
Isolation
Boundary
Microcontroller
10
9 or 15
A
B
R FS-EXT
390
GND2
Figure 1c. Typical wide-body transceiver connections.
11
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IL3685
Transceiver Operation
The transceiver block diagram is shown below:
Brownout
Detector
VDD1
100 k
VDD2
nominal
DE
Refresh
Clock
D
RFS1
30 k
A
R
B
RFS2
30 k
100 k
nominal
RE
GND
Figure 2. Detailed transceiver block diagram.
Receiver Features
The receiver output “R” has tri-state capability via the active low RE input.
Driver Features
The driver features low propagation delay skew to maximize bit width and minimize EMI. Drivers have tri-state capability via the active-high DE
input.
Deterministic Power Up and Brownout Detection
IL3685 parts have circuitry to disable the bus driver until the driver-side voltage (VDD2) reaches approximately 3.3 volts on power-up. The
transceiver is disabled when the voltage drops below approximately 3.1 volts on power-down. This brownout circuitry ensures the transceiver
does not “crash” the bus on power up, power down, or brownout, and eliminates the need for external power supply monitors. In addition, a
patented refresh circuit maintains the correct transceiver output state with respect to data input (DC correctness). The refresh circuit ensures the
bus outputs will follow the Function Table shown on Page 1 after power up.
Hot Plug Operation
Deterministic power-up allows IL3685 nodes to “hot plug” into the bus, since the bus driver will be in a high-impedance state until the bus
supply is enough for the bus driver to operate.
Unpowered Nodes
Unpowered nodes (i.e., either no VDD1 or VDD2 power) result in high impedances on the “A” and “B” bus lines , so the unpowered node will
not disturb bus operation.
Internal Fail-Safe Biasing Resistors
Internal “fail-safe biasing” forces a logic high state on “R” with an open-circuit between the bus “A” and “B” lines, or when no drivers are active
on the bus.
Rigorous PROFIBUS Compatibility
Unlike most other transceivers, IL3685E transceivers meet stringent PROFIBUS standards for maximum differential output voltage as well as
other PROFIBUS requirements.
Thermal Shutdown
The bus driver is disabled when the driver die temperature exceeds approximately 150 °C, and re-enabled when the die temperature drops below
approximately 135 °C. The receiver section continues to operate during thermal shutdown.
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IL3685
Termination and Fail-Safe Biasing
Internal Biasing Resistors
“Fail-safe biasing” forces a logic high state on “R” in response to an open-circuit condition between the bus “A” and “B” lines, or when no
drivers are active 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 in Figure 3 below):
5 V
RFS-EXT
VDD
30K
RFS-INT
A
RT
RT
R
RFS-EXT
RFS-INT
30K
B
GND
Figure 3. Termination and internal and external fail-safe biasing resistors.
These internal resistors ensure fail-safe operation if there are no termination resistors and up to four RS-485 worst-case Unit Loads of 12 kΩ.
Termination Resistors
Termination resistors should be on both ends of the network to minimize reflections. Values should be selected to match cable impedance; 220 Ω
resistors are typical for PROFIBUS.
External Fail-Safe Biasing Resistors
Termination resistors bring the differential voltage across the conductor pair close to zero with no active drivers. In this case, the idle bus is
indeterminate and susceptible to noise. External fail-safe biasing resistors (labeled RFS-EXT in Figure 3) at one end of the bus ensure fail-safe
operation with a terminated bus. Biasing should provide at least 200 mV across the conductor pair to meet the RS-485 input sensitivity
specification. Fail-safe resistors of 390 Ω are common for PROFIBUS. They should be on only one node of the network. Using the same value
for pull-up and pull-down biasing resistors maintains balance for positive- and negative going transitions.
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IL3685
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)
0.025 (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)
0.004 (0.10)
0.010 (0.25)
0.15" 16-pin Narrow-Body 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)
0.054 (1.37)
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)
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IL3685
0.3" 16-pin Wide-Body 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)
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IL3685
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" Narrow-Body 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)
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IL3685
0.3" 16-pin Wide-Body 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)
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IL3685
Ordering Information and Valid Part Numbers
IL 36 85 -3 V E TR13
Valid Part Numbers
IL3685E
IL3685E TR13
IL3685-3E
IL3685-3E TR13
IL3685-1E TR7
IL3685-1E TR13
Bulk Packaging
Blank = Tube
TR13 = 13'' Tape and Reel
Package
E = RoHS Compliant
Isolation Grade
Blank = 2.5 kV Basic Isolation
V = 6 kV Reinforced Isolation
IL3685VE
IL3685VE TR13
Package Type
Blank = 0.3'' SOIC
-3 = 0.15'' SOIC
-1 = 0.15'' QSOP
Channel Configuration
85 = RS-485
Base Part Number
36 = 40 Mbps, PROFIBUS compliant
Product Family
IL = Isolators
RoHS
COMPLIANT
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IL3685
Revision History
ISB-DS-001-IL3685-Z
August 2022
ISB-DS-001-IL3685-Y
ISB-DS-001-IL3685-X
Changes
•
Clarified truth table (p. 1).
Upgraded VDE approval to IEC 60747-17 (VDE 0884-17):2021-10 (p. 3).
•
Increased Working Voltage ratings based on latest VDE testing (p. 3).
•
Added IL3685VE ATEX / IEC 60079 certification for intrinsically safe applications (p. 3).
•
Changes
•
Upgrade from VDE V 0884-10 to VDE V 0884-11 / IEC 60747-17 (p. 3).
•
Separate power consumption specifications section; added dynamic power consumption (p. 6).
•
Revised thermal specifications (p. 8).
•
More details on power up, hot plug, brownout detection, and unpowered nodes (p. 12).
•
Updated EMC standards.
Change
•
ISB-DS-001-IL3685-W
Change
•
ISB-DS-001-IL3685-V
ISB-DS-001-IL3685-T
ISB-DS-001-IL3685-S
ISB-DS-001-IL3685-R
ISB-DS-001-IL3685-Q
Dropped 10 µF tantalum capacitor recommendation (p. 8).
Change
•
ISB-DS-001-IL3685-U
Improved thermal specifications based on new test data (p. 2).
Added IL3685VE to the list of available parts (p. 16).
Changes
•
Refined thermal resistance specifications based on additional test data (p. 2).
•
Added worst-case operating conditions to max. ambient operating temperature spec.
•
Deleted minimum magnetic field immunity specifications (p. 8) since it is not 100% tested.
Changes
•
Added QSOP version (IL3685-1E).
•
VDE certification and UL approval for V-Series version (6 kV reinforced isolation).
Changes
•
Eliminated inconsistent Driver Section output current specification.
•
Improved Receiver Section Line Input Current and Input Resistance specifications.
Changes
•
Updated VDE certification standard to VDE V 0884-10.
•
Upgraded “V” Version Surge Immunity specification to 12.8 kV.
•
Upgraded “V” Version VDE 0884-10 rating to reinforced insulation.
Changes
•
Increased V-Series isolation voltage to 6 kVrms.
•
Increased typ. Total Barrier Thickness specification to 0.016 mm.
•
Increased CTI min. specification to ≥600 VRMS.
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IL3685
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.
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IL3685
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-IL3685-Z
August 2022
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