IL485W
Isolated RS485 Interface With Handshake
Functional Diagram
Features
•
•
•
•
•
•
•
•
•
•
•
•
DE
D
R
RE
OUT
1
ISODE
A
B
IN
1
IL485W
V
ID
(A–B)
≥
200 mV
≤−200
mV
−7<V
I
<12
≥
1.5 V
≤−1.5
V
Open
DE
L
L
X
H
H
L
RE
L
L
H
L
L
ISODE
L
L
X
H
H
R
H
L
Z
H
L
D
X
X
X
H
L
Mode
Receive
Receive
Receive/Drive
Drive
Drive
2500 V
RMS
Isolation (1 min.)
25 ns Maximum Propagation Delay
35 Mbps Data Rate
1 ns Pulse Skew (typ.)
Designed for Multi-point Transmission
on Long Bus Lines in Noisy Environments
±60 mA Driver Output Capability
Thermal Shutdown Protection
Meets or Exceeds ANSI RS-485 and ISO 8482:1987(E)
−40°C
to +85°C Temperature Range
PROFIBUS International Component Recognition
16-Pin SOIC Package
UL1577 and IEC 61010-2001 Approval
Applications
•
Profibus/RS485 Systems
•
Multiple Data Point Transmission
Description
The IL485W is a galvanically isolated, high-speed differential bus
transceiver, designed for bidirectional data communication on
balanced transmission lines. The devices use NVE’s patented*
IsoLoop spintronic Giant Magnetoresistance (GMR) technology. The
IL485W is the first isolated RS-485 interface in a standard 16-pin
SOIC package that meets the ANSI Standards EIA/TIA-422-B and
RS-485 and is compatible with 3.3V input supplies.
The IL485W has current limiting and thermal shutdown features to
protect against output short circuits and bus contention situations that
could cause excessive power dissipation.
With 1 ns pulse skew and 16 ns propagation delay, the IL485W is
ideal for PROFIBUS applications.
DE/ISODE and IN1/OUT1 allow isolated RTSAS and DTSAS
handshaking.
L
L
H
X
Indeterminate
H = High Level, L = Low Level
X = Irrelevant, Z = High Impedance
OUT1
L
H
Z
RE
L
L
H
IN1
L
H
X
Isoloop is a registered trademark of NVE Corporation.
*U.S. Patent number 5,831,426; 6,300,617 and others.
REV. M
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
IL485W
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
Continuous Total Power Dissipation
Maximum Output Current
Lead Solder Temperature
ESD
I
O
2
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
5.5
V
DD
+ 1
725
377
95
260
Units
°C
°C
V
V
V
V
mW
mA
°C
kV
Test Conditions
25°C
85°C
10 sec.
HBM
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
Transient Immunity
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
20
t
IR
, t
IF
−60
−8
−40
85
Min.
4.5
Typ.
Max.
5.5
12
−7
V
DD
1
0.8
+12/−7
60
8
Units
V
V
V
V
V
mA
mA
mA
mA
°C
kV/μs
Test Conditions
3.0
0
DC Stable
Insulation Specifications
Parameters
Creepage Distance
Barrier Impedance
Leakage Current
Symbol
Min.
8.08
Typ.
>10
14
||7
0.2
Max.
Units
μA
Test Conditions
mm
Ω
|| pF
240 V
RMS
, 60 Hz
Safety and Approvals
IEC61010-1
TUV Certificate Numbers:
N1502812, N1502812-101
Classification: Reinforced Insulation
Model
IL485W
Package
0.3" SOIC
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
2
IL485W
IL485W Pin Connections
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
V
DD1
GND
1
R
OUT
1
RE
DE
D
GND
1
GND
2
ISODE
IN
1
A
B
NC
GND
2
V
DD2
Input Power Supply
Input Power Supply Ground Return
Output Data from Bus
Output from Auxiliary Isolation Channel
Read Data Enable
(if RE is high, R= high impedance)
Drive Enable
Data Input to Bus
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
No Internal Connection
Non-inverting Bus Line
Inverting Bus Line
No Internal Connection
Output Power Supply Ground Return
Output Power Supply
OUT
1
RE
DE
D
GND
1
B
A
IN
1
ISODE
GND
2
VDD
1
GND
1
R
VDD
2
GND
2
NC
IL485W
3
IL485W
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
0
(2)
Differential Output Voltage
|V
OD
1
|
1.5
(2)
Differential Output Voltage
|V
OD
2
|
1.5
2.5
(2)(6)
Differential Output Voltage
V
OD
3
1.5
Change in Magnitude of Differential
Δ|V
OD
|
Output Voltage
(7)
Common Mode Output Voltage
Change in Magnitude of Common
Mode Output Voltage
(7)
Output Current
(4)
Output Disabled
High Level Input Current
Low Level Input Current
Short-circuit Output Current
Supply Current
Parameters
Maximum Data Rate
Differential Output Prop Delay
Pulse Skew
(10)
Differential Output Rise & Fall Time
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
Skew Limit
(3)
V
OC
Δ|V
OC
|
I
O
I
IH
I
IL
I
OS
I
DD
1
Symbol
t
D
(OD)
t
S
(P)
t
T
(OD)
t
PZH
t
PZL
t
PHZ
t
PLZ
t
SK
(LIM)
4
Switching Specifications
Min.
Typ.
(5)
35
16
1
8
31
22
28
16
2
Max.
−1.5
6
6
5
5
±0.2
3
−1
±0.2
1
−0.8
10
−10
250
−150
−250
6
Max.
25
6
10
65
35
50
32
12
Units
V
V
V
V
V
V
V
V
mA
μA
μA
mΑ
mA
Units
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
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
V
O
= 12 V
V
O
=
−7
V
V
I
= 3.5 V
V
I
= 0.4 V
V
O
=
−6
V
V
O
= 0 V
V
O
= 8 V
No Load
(Outputs Enabled)
Test Conditions
R
L
= 54
Ω,
C
L
= 50 pF
R
L
= 54
Ω,
C
L
= 50 pF
R
L
= 54
Ω,
C
L
= 50 pF
R
L
= 54
Ω,
C
L
= 50 pF
R
L
= 54
Ω,
C
L
= 50 pF
R
L
= 54
Ω,
C
L
= 50 pF
R
L
= 54
Ω,
C
L
= 50 pF
R
L
= 54
Ω,
C
L
= 50 pF
R
L
= 54
Ω,
C
L
= 50 pF
Notes
(apply to both driver and receiver sections):
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 V
DD
1
,V
DD
2
= 5 V or V
DD
1
= 3.3 V and T
A
= 25°C.
6. The minimum V
OD
2
with a 100
Ω
load is either ½ V
OD
1
or 2 V, whichever is greater.
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 8 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.
1.
2.
3.
4.
4
IL485W
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
V
IT
+
Threshold Voltage
Negative-going Input
V
IT
-
−0.2
Threshold Voltage
Hysteresis Voltage (V
IT
+
−
V
IT
-
)
V
HYS
60
High Level Digital Output Voltage
Low Level Digital Output Voltage
High-impedance-state output current
Line Input Current
(8)
Input Resistance
Supply Current
Parameters
Maximum Data Rate
Propagation Delay
(9)
Pulse Skew
(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
V
OH
V
OL
I
OZ
I
I
r
I
I
DD
2
Symbol
t
PD
t
SK
(P)
t
SK
(LIM)
t
PZH
t
PZL
t
PHZ
t
PLZ
12
20
27
Switching Characteristics
Min.
Typ.
(5)
35
24
1
2
17
30
30
18
34
Max.
32
6
8
24
45
45
27
V
DD
−
0.2
0.2
±20
1
−0.8
Max.
0.2
Units
V
V
mV
V
V
μA
mA
kΩ
mA
Units
Mbps
ns
ns
ns
ns
ns
ns
ns
No load
Outputs Enabled
Test Conditions
R
L
= 54
Ω,
C
L
= 50 pF
V
O
=
−1.5
V to 1.5 V,
C
L
= 15 pF
V
O
=
−1.5
V 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
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
Other Input
(11)
= 0 V
Test Conditions
V
O
= 2.7 V,
I
O
=
−0.4
mA
V
O
= 0.5 V,
I
O
= 8 mA
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.
5
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