ETC IL3585

IL3585
Very High Speed Isolated RS-485 Interface
Functional Diagram
DE
Features
•
•
•
•
•
•
•
•
•
•
•
•
ISODE
D
A
B
R
RE
IL3585
VID (A-B)
DE
RE
R
D
3.3 / 5 V Input Supply Compatible
2500 VRMS Isolation (1 minute)
20 ns Propagation Delay
40 Mbps Data Rate
5 ns Pulse Skew
20 kV/μs Transient Immunity
Thermal Shutdown Protection
−40°C to +85°C Temperature Range
Meets or Exceeds ANSI RS-485 and ISO 8482:1987(E)
16-pin SOIC Package
UL1577 Approval
IEC 61010-2001 Approval
Mode
Applications
•
•
•
•
•
≥ 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
Security Networks
Building Environmental Controls
Industrial Control Networks
Gaming Systems
Factory Automation
Description
The IL3585 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.
The IL3585 delivers an exceptional 2.3 V differential output into a
54 Ω load over the supply range of 4.5 V to 5.5 V. This provides
better data integrity over longer cable lengths, even at data rates as
high as 40 Mbps. The device is also compatible with 3.3 V input
supplies, allowing interface to standard microcontrollers without
additional level shifting.
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
Phone: (952) 829-9217
Fax: (952) 829-9189
www.IsoLoop.com
©2007 NVE Corporation
IL3585
Absolute Maximum Ratings(11)
Parameters
Storage Temperature
Ambient Operating Temperature
Voltage Range at A or B Bus Pins
Supply Voltage (1)
Digital Input Voltage
Digital Output Voltage
Symbol
TS
TA
VDD1, VDD2
Min.
−65
−40
−7
−0.5
−0.5
−0.5
Typ.
Max.
150
100
12
7
VDD + 0.5
VDD + 1
Units
°C
°C
V
V
V
V
Test Conditions
Min.
3.0
4.5
Typ.
Max.
5.5
5.5
12
−7
Units
Test Conditions
VDD1
V
0.8
+12 / −7
60
V
V
mA
8
mA
Recommended Operating Conditions
Parameters
Input Voltage at any Bus Terminal
(separately or common mode)
Symbol
VDD1
VDD2
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
V
IOL
−60
mA
IOL
−8
mA
TA
−40
85
tIR, tIF
VDD1 = 3.3 V
VDD1 = 5.0 V
°C
DC Stable
Insulation Specifications
Parameters
Creepage Distance (external)
Barrier Impedance
Leakage Current
Symbol
Min.
8.08
Typ.
Max.
> 1014 || 7
0.2
Units
mm
Ω || pF
μARMS
Test Conditions
240 VRMS, 60 Hz
Safety and Approvals
IEC61010-2001
TUV Certificate Numbers:
N1502812, N1502812-101
Classification: Reinforced Insulation
Model
IL3585
Package
SOIC (0.3")
Pollution Degree
II
Material Group
III
Max. Working Voltage
300 VRMS
UL 1577
Component Recognition Program File Number: E207481
Rated 2500VRMS for 1 minute
Soldering Profile
Per JEDEC J-STD-020C, MSL=2
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.
2
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
Fax: (952) 829-9189
www.IsoLoop.com
©2007 NVE Corporation
IL3585
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
5
Output data from bus
VDD1
VDD2
RE
Read data enable
(if RE is high, R= high impedance)
GND1
GND2
DE
Drive enable
R
6
D
7
NC
Data input to bus
8
GND1
Input power supply ground return
(pin 8 is internally connected to pin 2)
9
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
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
No internal connection
NC
RE
B
DE
A
NC
D
ISODE
NC
GND2
GND1
No internal connection
No internal connection
3
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
Fax: (952) 829-9189
www.IsoLoop.com
©2007 NVE Corporation
IL3585
Driver Section
Electrical Specifications are Tmin to Tmax and VDD = 4.5 V to 5.5 V unless otherwise stated.
Parameters
Symbol
Min.
Typ.(5)
Input Clamp Voltage
VIK
Output voltage
VO
Differential Output Voltage(2)
|VOD1|
Differential Output Voltage(2)
|VOD2|
2.5
3
Differential Output Voltage(2, 6)
VOD3
2.3
Change in Magnitude of Differential
Δ|VOD|
Output Voltage(7)
Common Mode Output Voltage
VOC
Change in Magnitude of Common
Δ|VOC|
Mode Output Voltage(7)
Output Current(4)
IO
High Level Input Current
Low Level Input Current
Absolute |Short-circuit Output Current|
VDD1 = +5 V
Supply Current
VDD1 = +3.3 V
IIH
IIL
IOS
IDD1
IDD1
4
3
Max.
−1.5
VDD
VDD
5
5
Units
V
V
V
V
V
±0.2
V
RL = 54 Ω or 100 Ω
3
V
RL = 54 Ω or 100 Ω
±0.2
V
RL = 54 Ω or 100 Ω
1
−0.8
10
−10
250
6
4
mA
μA
μA
mA
mA
Test Conditions
IL = −18 mA
IO = 0
IO = 0
RL = 54 Ω, VDD = 5 V
RL = 54 Ω, VDD = 4.5 V
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.
2.
3.
4.
All Voltage values are with respect to network ground except differential I/O bus voltages.
Differential input/output voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
Skew limit is the maximum propagation delay difference between any two devices at 25°C.
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.
4
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
Fax: (952) 829-9189
www.IsoLoop.com
©2007 NVE Corporation
IL3585
Receiver Section
Electrical Specifications are Tmin to Tmax and VDD = 4.5 V to 5.5 V unless otherwise stated.
Parameters
Symbol
Min.
Typ.(5)
Positive-going Input Threshold
VIT+
Voltage
Negative-going Input Threshold
−0.2
VIT−
Voltage
Hysteresis Voltage (VIT+ − VIT−)
VHYS
40
Units
0.2
V
−7 V < VCM < 12 V
V
−7 V < VCM < 12 V
mV
High Level Digital Output Voltage
VOH
Low Level Digital Output Voltage
VOL
0.2
V
High-impedance-state output current
IOZ
±1
μA
Line Input Current
II
1
−0.8
Input Resistance
RI
mA
mA
kΩ
Supply Current
IDD2
8
mA
Max.
Units
Mbps
(8)
VDD – 0.2
Max.
VDD
V
20
5
Test Conditions
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)
Switching Characteristics
Parameters
Data Rate
Symbol
Propagation Delay(2, 9)
Pulse Skew(2, 10)
(3)
tPD
27
35
ns
tSK(P)
1
6
ns
12
25
25
25
25
ns
ns
ns
ns
ns
Max.
Units
Mbps
Skew Limit
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
tSK(LIM)
tPZH
tPZL
tPHZ
tPLZ
Parameters
Data Rate
Symbol
Propagation Delay(2, 9)
Pulse Skew(2, 10)
(3)
Skew Limit
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
VDD1 = +5 V, VDD2 = +5 V
Min.
Typ.(5)
40
2
15
15
15
15
VDD1 = +3.3 V, VDD2 = +5 V
Min.
Typ.(5)
40
tPD
30
38
ns
tSK(P)
1
6
ns
tSK(LIM)
tPZH
tPZL
tPHZ
tPLZ
4
17
17
17
17
12
27
27
27
27
ns
ns
ns
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
RL = 54 Ω, CL = 50 pF
CL = 15 pF
CL = 15 pF
CL = 15 pF
CL = 15 pF
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
5
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
Fax: (952) 829-9189
www.IsoLoop.com
©2007 NVE Corporation
IL3585
Dynamic Power Consumption
IsoLoop Isolators achieve their low power consumption from the way they transmit data across the isolation barrier. By detecting the edge
transitions of the input logic signal and converting these to narrow current pulses, a magnetic field is created around the GMR Wheatstone
bridge. Depending on the direction of the magnetic field, the bridge causes the output comparator to switch following the input logic signal.
Since the current pulses are narrow, about 2.5 ns, the power consumption is independent of mark-to-space ratio and solely dependent on
frequency. This has obvious advantages over optocouplers, which have power consumption heavily dependent on frequency and time.
Table 2. Typical Dynamic Supply Currents.
Data Rate (Mbps)
1
10
20
40
IDD2
150 μA
1.5 mA
3 mA
6 mA
IDD1
150 μA
1.5 mA
3 mA
6 mA
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.
DC Correctness
The IL3585 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.
Application Information
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 IL3585 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.
6
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3585
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 table below.
Fail-Safe Biasing
5V
RFS-EXT
VDD
30K
RFS-INT
A
RFS-EXT
Internal Only
Internal Only
560 Ω
510 Ω
RT
None
120 Ω
120 Ω
120 Ω
B
RFS-EXT
30K
RFS-INT
GND
RT
RT
R
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
(inactive)
238 mV
5 mV
254 mV
247 mV
Fail-Safe
Operation?
Yes
No
Yes
Yes
7
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3585
Package Drawings, Dimensions and Specifications
0.3" 16-pin SOIC Package
Dimensions in inches (mm)
0.287 (7.29)
0.300 (7.62)
0.013 (0.3)
0.020 (0.5)
NOM
0.016 (0.4)
0.050 (1.3)
0.007 (0.2)
0.013 (0.3)
0.397 (10.08)
0.413 (10.50)
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)
0.040 (1.0)
0.060 (1.5)
0.394 (10.00)
0.419 (10.64)
0.004 (0.1)
0.012 (0.3)
Ordering Information and Valid part Numbers
IL 3585 E TR13
Bulk Packaging
Blank = Tube
TR13 = 13'' Tape and Reel
Valid Part Numbers
IL3585E
IL3585E TR13
Package
E = RoHS Compliant
Base Part Number
3585 = RS-485 Transceiver
Product Family
IL = Isolators
RoHS
COMPLIANT
8
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3585
Revision History
ISB-DS-001-IL3585-H
September 2007
Change
ISB-DS-001-IL3585-G
Change
•
•
ISB-DS-001-IL3585-F
April 2007
ISB-DS-001-IL3585-E
ISB-DS-001-IL3585-C
Reorganized specification tables
Change
•
Eliminated soldering profile chart
Changes
•
ISB-DS-001-IL3585-D
Changed ordering information to reflect that devices are now fully RoHS compliant with
no exemptions.
Eliminated references to PROFIBUS compatibility (IL3685 recommended for PROFIBUS)
Changes
1.
Specified “open” input condition in truth table
2.
Added fail-safe biasing section.
3.
Updated package drawing.
Changes
4.
UL File Number and TUV Certificate numbers added to page two
5.
Soldering Profile added.
6.
Leaded parts option removed.
7.
0.3'' parts diagram dimensions updated
9
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3585
About NVE
An ISO 9001 Certified Company
NVE Corporation manufactures innovative products based on unique spintronic Giant Magnetoresistive (GMR) technology. Products include
Magnetic Field Sensors, Magnetic Field Gradient Sensors (Gradiometers), Digital Magnetic Field Sensors, Digital Signal Isolators, and Isolated
Bus Transceivers.
NVE pioneered spintronics and in 1994 introduced the world’s first products using GMR material, a line of ultra-precise magnetic sensors for
position, magnetic media, gear speed and current sensing.
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax: (952) 829-9189
Internet: www.nve.com
e-mail: [email protected]
The information provided by NVE Corporation is believed to be accurate. However, no responsibility is assumed by NVE Corporation for its use,
nor for any infringement of patents, nor rights or licenses granted to third parties, which may result from its use. No license is granted by
implication, or otherwise, under any patent or patent rights of NVE Corporation. NVE Corporation does not authorize, nor warrant, any NVE
Corporation product for use in life support devices or systems or other critical applications, without the express written approval of the
President of NVE Corporation.
Specifications are subject to change without notice.
ISB-DS-001-IL3585-H
September 2007
10
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com