IL3522
Isolated RS485/RS422 Interface
Functional Diagram
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
DE
ISODE
D
R
RE
Y
Z
A
B
3.3 / 5 V Input Supply Compatible
2500 V
RMS
Isolation (1 minute)
20 ns Propagation Delay
40 Mbps Data Rate
1 ns Pulse Skew
20 kV/μs Transient Immunity
Thermal Shutdown Protection
−40°C
to +85°C Temperature Range
16-pin SOIC Package
UL1577 and IEC 61010-2001 Approval
Security Networks
Building Environmental Controls
Industrial Control Networks
Gaming Systems
Factory Automation
Applications
IL3522
IL3522 Receiver
RE
H
L
L
L
R
Z
H
L
H
V
(A−B)
X
≥
200 mV
≤−200
mV
Open
IL3522 Driver
DE
L
H
H
D
X
H
L
V
(Y−Z)
Z
≥
200 mV
≤−200
mV
Description
The IL3522 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.
H = High Level, L = Low Level
X = Irrelevant, Z = High Impedance
IsoLoop
®
is a registered trademark of NVE Corporation.
*U.S. Patent number 5,831,426; 6,300,617 and others.
REV. E
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IL3522
Absolute Maximum Ratings
(11)
Parameters
Storage Temperature
Ambient Operating Temperature
Voltage Range at any Bus Pin
Supply Voltage
(1)
Digital Input Voltage
Digital Output Voltage
Symbol
T
S
T
A
V
DD
1
, V
DD
2
Min.
−65
−40
−7
−0.5
−0.5
−0.5
Typ.
Max.
150
100
12
7
V
DD
+ 0.5
V
DD
+ 1
Units
°C
°C
V
V
V
V
Test Conditions
Recommended Operating Conditions
Parameters
Supply Voltage
Input Voltage at any Bus Terminal
(separately or common mode)
High-Level Digital Input Voltage
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
Symbol
V
DD
1
V
DD
2
V
I
V
IC
V
IH
V
IL
V
ID
I
OH
I
OH
I
OL
I
OL
T
A
t
IR
, t
IF
−60
−8
−40
85
DC Stable
Min.
3.0
4.5
Typ.
Max.
5.5
5.5
12
−7
V
DD
1
0.8
+12/−7
60
8
Units
V
V
V
V
V
mA
mA
mA
mA
°C
V
DD
1
= 3.3 V
V
DD
1
= 5.0 V
Test Conditions
2.4
3.0
0
Insulation Specifications
Parameters
Creepage Distance (external)
Barrier Impedance
Leakage Current
Symbol
Min.
8.08
Typ.
> 10
14
|| 7
0.2
Max.
Units
mm
Ω
|| pF
μA
RMS
Test Conditions
240 V
RMS
, 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 V
RMS
UL 1577
Component Recognition Program File Number: E207481
Rated 2500V
RMS
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
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IL3522
IL3522 Pin Connections
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
V
DD1
GND
1
R
RE
DE
D
NC
GND
1
GND
2
ISODE
Y
Z
B
A
GND
2
V
DD2
Input Power Supply
Input Power Supply Ground Return
Output Data from Bus
Read Data Enable
(if RE is high, R = high impedance)
Drive Enable
Data Input to Bus
No Internal Connection
Input Power Supply Ground Return
Output Power Supply Ground Return
Isolated DE Output for use in Profibus
applications where the state of the isolated
drive enable node needs to be monitored
Y Bus (Drive – True)
Z Bus (Drive – Inverse)
B Bus (Receive – Inverse)
A Bus (Receive – True)
Output Power Supply Ground Return
Output Power Supply
RE
DE
D
NC
GND
1
B
Z
Y
ISODE
GND
2
VDD
1
GND
1
R
VDD
2
GND
2
A
IL3522
3
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IL3522
Driver Section
Electrical Specifications are T
min
to T
max
and V
DD
= 4.5 V to 5.5 V, unless otherwise stated.
Parameters
Symbol
Min.
Typ.
(5)
Input Clamp Voltage
V
IK
Output voltage
V
O
(12)
Differential Output Voltage
|V
OD
1
|
Differential Output Voltage
(12)
|V
OD
2
|
2.5
3
(12, 6)
Differential Output Voltage
V
OD
3
2.3
Change in Magnitude of Differential
Δ|V
OD
|
Output Voltage
(7)
Common Mode Output Voltage
V
OC
Change in Magnitude of Common
Δ|V
OC
|
Mode Output Voltage
(7)
Output Current
(4)
High Level Input Current
Low Level Input Current
Absolute |Short-circuit Output Current|
V
DD
1
= +5 V
Supply Current
V
DD
1
= +3.3 V
I
O
I
IH
I
IL
I
OS
I
DD
1
I
DD
1
Max.
−1.5
V
DD
V
DD
5
5
±0.2
3
±0.2
1
−0.8
10
−10
250
6
4
Units
V
V
V
V
V
V
V
V
mA
μA
μA
mA
mA
Test Conditions
I
L
=
−18
mA
I
O
= 0
I
O
= 0
R
L
= 54
Ω,
V
DD
= 5 V
R
L
= 54
Ω,
V
DD
= 4.5 V
R
L
= 54
Ω
or 100
Ω
R
L
= 54
Ω
or 100
Ω
R
L
= 54
Ω
or 100
Ω
Output Disabled,
V
O
= 12
V
O
=
−7
4
3
V
I
= 3.5 V
V
I
= 0.4 V
−7
V > V
O
< 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 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 V
DD
1
,V
DD
2
= 5 V or V
DD
1
= 3.3 V and T
A
= 25°C.
6.
−7
V < V
CM
< 12 V; 4.5 V < V
DD
< 5.5 V.
7.
Δ|V
OD
| and
Δ|V
OC
| are the changes in magnitude of V
OD
and V
OC
, 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 |t
PLH
– t
PHL
| 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. Differential output voltage is measured at terminal Y with respect to Z.
4
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IL3522
Receiver Section
Electrical Specifications are T
min
to T
max
and V
DD
= 4.5 V to 5.5 V, unless otherwise stated.
Parameters
Symbol
Min.
Typ.
(5)
Positive-going Input Threshold
V
IT
+
Voltage
(2)
Negative-going Input Threshold
−0.2
V
IT
-
Voltage
(2)
Hysteresis Voltage (V
IT
+
−
V
IT
-
)
V
HYS
40
High Level Digital Output Voltage
Low Level Digital Output Voltage
High-impedance-state output current
Line Input Current
(8)
Input Resistance
Supply Current
V
OH
V
OL
I
OZ
I
I
R
I
I
DD
2
20
5
8
V
DD
– 0.2
V
DD
0.2
±1
1
−0.8
Max.
0.2
Units
V
V
mV
V
V
μA
mA
mA
kΩ
mA
Test Conditions
−7
V > V
CM
< 12 V
−7
V > V
CM
< 12 V
V
CM
= 0 V, T = 25°C
V
ID
= 200 mV
I
OH
=
−20 μA
V
ID
=
−200
mV
I
OH
= 20
μA
V
O
=0.4 to (V
DD
2
−0.5)
V
V
I
= 12 V
V
I
=
−7
V
No load
(Outputs Enabled)
Switching Characteristics
Parameters
Data Rate
Propagation Delay
(2, 9)
Pulse Skew
(2, 10)
Skew Limit
(3)
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
Parameters
Data Rate
Propagation Delay
(2, 9)
Pulse Skew
(2, 10)
Skew Limit
(3)
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
Symbol
t
PD
t
SK
(P)
t
SK
(LIM)
t
PZH
t
PZL
t
PHZ
t
PLZ
Symbol
t
PD
t
SK
(P)
t
SK
(LIM)
t
PZH
t
PZL
t
PHZ
t
PLZ
V
DD1
= +5 V, V
DD2
= +5 V
Min.
Typ.
(5)
40
27
1
2
15
15
15
15
V
DD1
= +3.3 V, V
DD2
= +5 V
Min.
Typ.
(5)
40
30
1
4
17
17
17
17
Max.
35
6
12
25
25
25
25
Max.
38
6
12
27
27
27
27
Units
Mbps
ns
ns
ns
ns
ns
ns
ns
Units
Mbps
ns
ns
ns
ns
ns
ns
ns
Test Conditions
R
L
= 54
Ω,
C
L
= 50 pF
V
O
=
−1.5
to 1.5 V,
C
L
= 15 pF
V
O
=
−1.5
to 1.5 V,
C
L
= 15 pF
R
L
= 54
Ω,
C
L
= 50 pF
C
L
= 15 pF
C
L
= 15 pF
C
L
= 15 pF
C
L
= 15 pF
Test Conditions
R
L
= 54
Ω,
C
L
= 50 pF
V
O
=
−1.5
to 1.5 V,
C
L
= 15 pF
V
O
=
−1.5
to 1.5 V,
C
L
= 15 pF
R
L
= 54
Ω,
C
L
= 50 pF
C
L
= 15 pF
C
L
= 15 pF
C
L
= 15 pF
C
L
= 15 pF
5
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